MAX1806EUA25-T中文资料
MAX3280EAUK+T中文资料
Features
o ESD Protection: ±15kV–Human Body Model ±6kV–IEC 1000-4-2, Contact Discharge ±12kV–IEC 1000-4-2, Air-Gap Discharge
o Guaranteed 52Mbps Data Rate o Guaranteed 15ns Receiver Propagation Delay o Guaranteed 2ns Receiver Skew o Guaranteed 8ns Package-to-Package Skew Time o VL Pin for Connection to FPGAs/ASICs o Allow Up to 128 Transceivers on the Bus
Receiver Output Voltage (RO)....................-0.3V to (VCC + 0.3V) Receiver Output Voltage
(RO) (MAX3284E) .....................................-0.3V to (VL + 0.3V) Receiver Output Short-Circuit Current .......................Continuous
ENABLE —
Active High Active Low
—
DATA RATE 52Mbps 52Mbps 52Mbps
52Mbps (Note 1)
PACKAGE 5-Pin SOT23 6-Pin SOT23 6-Pin SOT23 6-Pin SOT23
________________________________________________________________ Maxim Integrated Products 1
MAX1722EZK-T中文资料
MAX1722
FB 3
4
OUT
THIN SOT23-5
Pin Configurations are continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
元器件交易网
19-1735; Rev 0; 7/01
1.5µA IQ, Step-Up DC-DC Converters in Thin SOT23-5
General Description
The MAX1722/MAX1723/MAX1724 compact, high-efficiency, step-up DC-DC converters are available in tiny, 5pin thin SOT23 packages. They feature an extremely low 1.5µA quiescent supply current to ensure the highest possible light-load efficiency. Optimized for operation from one to two alkaline or nickel-metal-hydride (NiMH) cells, or a single Li+ cell, these devices are ideal for applications where extremely low quiescent current and ultra-small size are critical. Built-in synchronous rectification significantly improves efficiency and reduces size and cost by eliminating the need for an external Schottky diode. All three devices feature a 0.5Ω N-channel power switch. The MAX1722/ MAX1724 also feature proprietary noise-reduction circuitry, which suppresses electromagnetic interference (EMI) caused by the inductor in many step-up applications. The family offers different combinations of fixed or adjustable outputs, shutdown, and EMI reduction (see Selector Guide). o o o o o o o o o o o
MAX1951ESA-T中文资料
General DescriptionThe MAX1951/MAX1952 high-efficiency, DC-to-DC step-down switching regulators deliver up to 2A of out-put current. The devices operate from an input voltage range of 2.6V to 5.5V and provide an output voltage from 0.8V to V IN , making the MAX1951/MAX1952 ideal for on-board postregulation applications. The MAX1951total output error is less than 1% over load, line, and temperature.The MAX1951/MAX1952 operate at a fixed frequency of 1MHz with an efficiency of up to 94%. The high operating frequency minimizes the size of external components.Internal soft-start control circuitry reduces inrush current.Short-circuit and thermal-overload protection improve design reliability.The MAX1951 provides an adjustable output from 0.8V to V IN , whereas the MAX1952 has a preset output of 1.8V. Both devices are available in a space-saving 8-pin SO package.ApplicationsASIC/DSP/µP/FPGA Core and I/O Voltages Set-Top Boxes Cellular Base StationsNetworking and TelecommunicationsFeatureso Compact 0.385in 2Circuit Footprinto 10µF Ceramic Input and Output Capacitors, 2µH Inductor for 1.5A Output o Efficiency Up to 94%o 1% Output Accuracy Over Load, Line, and Temperature (MAX1951, Up to 1.5A)o Guaranteed 2A Output Current o Operate from 2.6V to 5.5V Supplyo Adjustable Output from 0.8V to V IN (MAX1951)o Preset Output of 1.8V (1.5% Accuracy) (MAX1952)o Internal Digital Soft-Softo Short-Circuit and Thermal-Overload ProtectionMAX1951/MAX19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators________________________________________________________________Maxim Integrated Products 1Ordering Information19-2622; Rev 1; 8/03For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Typical Operating CircuitPin ConfigurationM A X 1951/M A X 19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.IN, V CC to GND........................................................-0.3V to +6V COMP, FB, REF to GND.............................-0.3V to (V CC + 0.3V)LX to Current (Note 1).........................................................±4.5A PGND to GND.............................................Internally Connected Continuous Power Dissipation (T A = +85°C)8-Pin SO (derate 12.2mW/°C above +70°C)................976mWOperating Temperature RangeMAX195_ ESA..................................................-40°C to +85°C Junction Temperature Range............................-40°C to +150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CNote 1:LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceedthe IC ’s package power dissipation limits.MAX1951/MAX19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V IN = V CC = 3.3V, PGND = GND, FB in regulation, C REF = 0.1µF, T A = 0°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.)ELECTRICAL CHARACTERISTICSM A X 1951/M A X 19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators 4_______________________________________________________________________________________Note 3:The LX output is designed to provide 2.4A RMS current.ELECTRICAL CHARACTERISTICS (continued)(V IN = V CC = 3.3V, PGND = GND, FB in regulation, C REF = 0.1µF, T A = -40°C to +85°C , unless otherwise noted.) (Note 2)MAX1951/MAX19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators_______________________________________________________________________________________5EFFICIENCY vs. LOAD CURRENT(V CC = V IN = 5V)LOAD CURRENT (mA)E F F I C I E N C Y (%)100010010203040506070809010001010,000EFFICIENCY vs. LOAD CURRENT(V CC = V IN = 3.3V)LOAD CURRENT (mA)E F F I C I E N C Y (%)100010010203040506070809010001010,000REF VOLTAGEvs. REF OUTPUT CURRENTREF OUTPUT CURRENT (µA)R E F V O L T A G E (V )35302520151051.9901.9911.9921.9931.9941.9951.98940SWITCHING FREQUENCY vs. INPUT VOLTAGEINPUT VOLTAGE (V)S W I T C H I N G F R E Q U E N C Y (M H z )5.14.63.13.64.10.850.900.951.001.051.101.151.200.802.65.6OUTPUT VOLTAGE DEVIATIONvs. LOAD CURRENTLOAD CURRENT (A)O U T P U T V O L T A G ED E V I A T I O N (m V)1.20.80.4-5-4-3-2-10123456-61.6Typical Operating Characteristics(Typical values are at V IN = V CC = 5V, V OUT = 1.5V, I OUT = 1.5A, and T A = +25°C, unless otherwise noted. See Figure 2.)LOAD TRANSIENT RESPONSEMAX1951 toc0640µs/div0OUTPUT VOLTAGE:100mV/div, AC-COUPLED OUTPUT CURRENT:0.5A/div V IN = 5V V OUT = 2.5V I OUT = 0.5 TO 1ALOAD TRANSIENT RESPONSEMAX1951 toc0740µs/divOUTPUT VOLTAGE:100mV/div, AC-COUPLEDOUTPUT CURRENT:0.5A/div V IN = 3.3V V OUT = 1.5V I OUT = 0.5 TO 1AM A X 1951/M A X 19521MHz, All Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators 6_______________________________________________________________________________________Typical Operating Characteristics (continued)(Typical values are at V IN = V CC = 5V, V OUT = 1.5V, I OUT = 1.5A, and T A = +25°C, unless otherwise noted. See Figure 2.)SHUTDOWN CURRENT vs. INPUT VOLTAGEM A X 1951 t o c 12INPUT VOLTAGE (V)S H U T D O W N C U R R E N T (m A )5.04.54.03.53.00.10.20.30.40.50.60.70.80.91.002.55.5SWITCHING WAVEFORMSMAX1951 toc08200ns/div0INDUCTOR CURRENT 1A/divV LX 5V/divOUTPUT VOLTAGE 10mV/div, AC-COUPLEDV IN = 3.3V V OUT = 1.8V I LOAD = 1.5ASOFT-START WAVEFORMSMAX1951 toc091ms/divV COMP 2V/divOUTPUT VOLTAGE 1V/divV IN = V CC = 3.3V V OUT = 2.5V I LOAD = 1.5ASOFT-START WAVEFORMSMAX1951 toc101ms/divV COMP 2V/divOUTPUT VOLTAGE 0.5V/divV IN = V CC = 3.3V V OUT = 0.8VSHUTDOWN WAVEFORMSMAX1951 toc1120µs/divV COMP 2V/divV LX 5V/divOUTPUT VOLTAGE 1V/divV IN = V CC = 3.3V V OUT = 2.5V I LOAD = 1.5AMAX1951/MAX19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators_______________________________________________________________________________________7Detailed DescriptionThe MAX1951/MAX1952 high-efficiency switching regula-tors are small, simple, DC-to-DC step-down converters capable of delivering up to 2A of output current. The devices operate in pulse-width modulation (PWM) at a fixed frequency of 1MHz from a 2.6V to 5.5V input voltage and provide an output voltage from 0.8V to V IN , making the MAX1951/MAX1952 ideal for on-board postregula-tion applications. The high switching frequency allows for the use of smaller external components, and internal synchronous rectifiers improve efficiency and eliminate the typical Schottky free-wheeling diode. Using the on-resistance of the internal high-side MOSFET to sense switching currents eliminates current-sense resistors,further improving efficiency and cost. The MAX1951total output error over load, line, and temperature (0°C to +85°C) is less than 1%.Controller Block FunctionThe MAX1951/MAX1952 step-down converters use a PWM current-mode control scheme. An open-loop com-parator compares the integrated voltage-feedback signal against the sum of the amplified current-sense signal and the slope compensation ramp. At each rising edge of the internal clock, the internal high-side MOSFET turns on until the PWM comparator trips. During this on-time, cur-rent ramps up through the inductor, sourcing current to the output and storing energy in the inductor. The current-mode feedback system regulates the peak inductor cur-rent as a function of the output voltage error signal. Since the average inductor current is nearly the same as the peak inductor current (<30% ripple current), the circuit acts as a switch-mode transconductance amplifier. To preserve inner-loop stability and eliminate inductor stair-casing, a slope-compensation ramp is summed into the main PWM comparator. During the second half of the cycle, the internal high-side P-channel MOSFET turns off,and the internal low-side N-channel MOSFET turns on.The inductor releases the stored energy as its current ramps down while still providing current to the output. The output capacitor stores charge when the inductor current exceeds the load current, and discharges when the inductor current is lower, smoothing the voltage across the load. Under overload conditions, when the inductor current exceeds the current limit (see the Current Limit section), the high-side MOSFET does not turn on at the rising edge of the clock and the low-side MOSFET remains on to let the inductor current ramp down.Current SenseAn internal current-sense amplifier produces a current signal proportional to the voltage generated by the high-side MOSFET on-resistance and the inductor cur-rent (R DS(ON) x I LX ). The amplified current-sense signal and the internal slope compensation signal are summed together into the comparator ’s inverting input.The PWM comparator turns off the internal high-side MOSFET when this sum exceeds the output from the voltage-error amplifier.Current LimitThe internal high-side MOSFET has a current limit of 3.1A (typ). If the current flowing out of LX exceeds this limit,the high-side MOSFET turns off and the synchronous rectifier turns on. This lowers the duty cycle and causes the output voltage to droop until the current limit is no longer exceeded. A synchronous rectifier current limit of -0.6A (typ) protects the device from current flowing into LX. If the negative current limit is exceeded, the synchro-nous rectifier turns off, forcing the inductor current to flowM A X 1951/M A X 19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators 8_______________________________________________________________________________________through the high-side MOSFET body diode, back to the input, until the beginning of the next cycle or until the inductor current drops to zero. The MAX1951/MAX1952utilize a pulse-skip mode to prevent overheating during short-circuit output conditions. The device enters pulse-skip mode when the FB voltage drops below 300mV, lim-iting the current to 3A (typ) and reducing power dissipation. Normal operation resumes upon removal of the short-circuit condition.V CC DecouplingDue to the high switching frequency and tight output tolerance (1%), decouple V CC with a 0.1µF capacitor connected from V CC to GND, and a 10Ωresistor con-nected from V CC to IN. Place the capacitor as close to V CC as possible.Soft-StartThe MAX1951/MAX1952 employ digital soft-start circuitry to reduce supply inrush current during startup conditions.When the device exits undervoltage lockout (UVLO), shut-down mode, or restarts following a thermal-overload event, or the external pulldown on COMP is released, the digital soft-start circuitry slowly ramps up the voltages at REF and FB (see the Soft-Start Waveforms in the Typical Operating Characteristics).Undervoltage LockoutIf V CC drops below 2.25V, the UVLO circuit inhibits switching. Once V CC rises above 2.35V, the UVLO clears, and the soft-start sequence activates.Compensationand Shutdown ModeThe output of the internal transconductance voltage error amplifier connects to COMP. The normal operation voltage for COMP is 1V to 2.2V. To shut down the MAX1951/MAX1952, use an NPN bipolar junction transistor or a very low output capacitance open-drain MOSFET to pull COMP to GND. Shutdown mode causes the internal MOSFETs to stop switching, forces LX to a high-impedance state, and shorts REF to G ND.Release COMP to exit shutdown and initiate the soft-start sequence.Thermal-Overload ProtectionThermal-overload protection limits total power dissipation in the device. When the junction temperature exceeds T J = +160°C, a thermal sensor forces the device into shut-down, allowing the die to cool. The thermal sensor turns the device on again after the junction temperature cools by 15°C, resulting in a pulsed output during continuous overload conditions. Following a thermal-shutdown condi-tion, the soft-start sequence begins.Figure 1. Functional DiagramMAX1951/MAX19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators_______________________________________________________________________________________9Design ProcedureOutput Voltage Selection: Adjustable(MAX1951) or Preset (MAX1952)The MAX1951 provides an adjustable output voltage between 0.8V and V IN . Connect FB to output for 0.8V output. To set the output voltage of the MAX1951 to a voltage greater than V FB (0.8V typ), connect the output to FB and G ND using a resistive divider, as shown in Figure 2a. Choose R2 between 2k Ωand 20k Ω, and set R3 according to the following equation:R3 = R2 x [(V OUT / V FB ) – 1]The MAX1951 PWM circuitry is capable of a stable min-imum duty cycle of 18%. This limits the minimum output voltage that can be generated to 0.18 ✕V IN . Instability may result for V IN /V OUT ratios below 0.18.The MAX1952 provides a preset output voltage.Connect the output to FB, as shown in Figure 2b.Output Inductor DesignUse a 2µH inductor with a minimum 2A-rated DC cur-rent for most applications. For best efficiency, use an inductor with a DC resistance of less than 20m Ωand a saturation current greater than 3A (min). See Table 2for recommended inductors and manufacturers. For most designs, derive a reasonable inductor value (L INIT ) from the following equation:L INIT = V OUT x (V IN - V OUT ) / (V IN x LIR x I OUT(MAX)x f SW )where f SW is the switching frequency (1MHz typ) of the oscillator. Keep the inductor current ripple percentage LIR between 20% and 40% of the maximum load cur-rent for the best compromise of cost, size, and perfor-mance. Calculate the maximum inductor current as:I L(MAX)= (1 + LIR / 2) x I OUT(MAX)Check the final values of the inductor with the output ripple voltage requirement. The output ripple voltage is given by:V RIPPLE = V OUT x (V IN - V OUT ) x ESR / (V IN x L FINAL x f SW )where ESR is the equivalent series resistance of the output capacitors.Input Capacitor DesignThe input filter capacitor reduces peak currents drawn from the power source and reduces noise and voltage ripple on the input caused by the circuit ’s switching.The input capacitor must meet the ripple current requirement (I RMS ) imposed by the switching currents defined by the following equation:For duty ratios less than 0.5, the input capacitor RMS current is higher than the calculated current. Therefore,use a +20% margin when calculating the RMS current at lower duty cycles. Use ceramic capacitors for their low ESR, equivalent series inductance (ESL), and lower cost. Choose a capacitor that exhibits less than 10°C temperature rise at the maximum operating RMS cur-rent for optimum long-term reliability.After determining the input capacitor, check the input ripple voltage due to capacitor discharge when the high-side MOSFET turns on. Calculate the input ripple voltage as follows:V IN_RIPPLE = (I OUT x V OUT ) / (f SW x V IN x C IN )Keep the input ripple voltage less than 3% of the input voltage.Output Capacitor DesignThe key selection parameters for the output capacitor are capacitance, ESR, ESL, and the voltage rating requirements. These affect the overall stability, output ripple voltage, and transient response of the DC-to-DC converter. The output ripple occurs due to variations in the charge stored in the output capacitor, the voltage drop due to the capacitor ’s ESR, and the voltage drop due to the capacitor ’s ESL. Calculate the output voltage ripple due to the output capacitance, ESR, and ESL as:V RIPPLE = V RIPPLE(C)+ V RIPPLE(ESR) + V RIPPLE(ESL)where the output ripple due to output capacitance,ESR, and ESL is:V RIPPLE(C)= I P-P / (8 x C OUT x f SW )V RIPPLE(ESR) = I P-P x ESRV RIPPLE(ESL)= (I P-P / t ON ) x ESL or (I P-P / t OFF ) x ESL,whichever is greater and I P-P the peak-to-peak inductor current is:I P-P = [ (V IN – V OUT ) / f SW x L) ] x V OUT / V INUse these equations for initial capacitor selection, but determine final values by testing a prototype or evalua-tion circuit. As a rule, a smaller ripple current results in less output voltage ripple. Since the inductor ripple current is a factor of the inductor value, the output voltage ripple decreases with larger inductance. Use ceramic capacitors for their low ESR and ESL at the switching frequency of the converter. The low ESL of ceramic capacitors makes ripple voltages negligible.Load transient response depends on the selected output capacitor. During a load transient, the output instantly changes by ESR x I LOAD . Before the controller can respond, the output deviates further, depending on the inductor and output capacitor values. After a short time (see the Load Transient Response graphin theM A X 1951/M A X 19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators 10______________________________________________________________________________________Typical Operating Characteristic s), the controller responds by regulating the output voltage back to its nominal state. The controller response time depends on the closed-loop bandwidth. A higher bandwidth yields a faster response time, thus preventing the output from deviating further from its regulating value.Compensation DesignThe double pole formed by the inductor and output capacitor of most voltage-mode controllers introduces a large phase shift, which requires an elaborate compensa-tion network to stabilize the control loop. The MAX1951/MAX1952 utilize a current-mode control scheme that reg-ulates the output voltage by forcing the required current through the external inductor, eliminating the double pole caused by the inductor and output capacitor, and greatly simplifying the compensation network. A simple type 1compensation with single compensation resistor (R 1) and compensation capacitor (C 2) creates a stable and high-bandwidth loop.An internal transconductance error amplifier compen-sates the control loop. Connect a series resistor and capacitor between COMP (the output of the error ampli-fier) and G ND to form a pole-zero pair. The external inductor, internal current-sensing circuitry, output capacitor, and the external compensation circuit deter-mine the loop system stability. Choose the inductor and output capacitor based on performance, size, and cost.Additionally, select the compensation resistor and capacitor to optimize control-loop stability. The compo-nent values shown in the typical application circuit (Figure 2) yield stable operation over a broad range of input-to-output voltages.The basic regulator loop consists of a power modulator,an output feedback divider, and an error amplifier. The power modulator has DC gain set by gmc x R LOAD ,with a pole-zero pair set by R LOAD , the output capaci-tor (C OUT ), and its ESR. The following equations define the power modulator:Modulator gain:G MOD = ∆V OUT / ∆V COMP = gmc x R LOAD Modulator pole frequency:fp MOD = 1 / (2 x πx C OUT x (R LOAD +ESR))Modulator zero frequency:fz ESR = 1 / (2 x πx C OUT x ESR)where, R LOAD = V OUT / I OUT(MAX), and gmc = 4.2S.The feedback divider has a gain of G FB = V FB / V OUT ,where V FB is equal to 0.8V. The transconductance error amplifier has a DC gain, G EA(DC),of 70dB. The com-pensation capacitor, C 2,and the output resistance of the error amplifier, R OEA (20M Ω), set the dominantpole. C 2and R 1 set a compensation zero. Calculate the dominant pole frequency as:fp EA = 1 / (2πx C C x R OEA )Determine the compensation zero frequency is:fz EA = 1 / (2πx C C x R C )For best stability and response performance, set the closed-loop unity-gain frequency much higher than the modulator pole frequency. In addition, set the closed-loop crossover unity-gain frequency less than, or equal to, 1/5 of the switching frequency. However, set the maximum zero crossing frequency to less than 1/3 of the zero frequency set by the output capacitance and its ESR when using POSCAP, SPCAP, OSCON, or other electrolytic capacitors.The loop-gain equation at the unity-gain frequency is:G EA(fc) x G MOD(fc) x V FB / V OUT = 1where G EA(fc )= gm EA x R 1, and G MOD(fc)= gmc x R LOAD x fp MOD /f C, where gm EA = 60µS .R 1calculated as:R 1= V OUT x K / (gm EA x V FB x G MOD(fc))where K is the correction factor due to the extra phase introduced by the current loop at high frequencies (>100kHz). K is related to the value of the output capacitance (see Table 1 for values of K vs. C). Set the error-amplifier compensation zero formed by R 1and C 2at the modulator pole frequency at maximum load. C 2is calculated as follows:C 2= (2 x V OUT x C OUT / (R 1 x I OUT(MAX))As the load current decreases, the modulator pole also decreases; however, the modulator gain increases accordingly, resulting in a constant closed-loop unity-gain frequency. Use the following numerical example to calculate R 1and C 2values of the typical application circuit of Figure 2a.Table 1. K ValueV OUT = 1.5VI OUT(MAX)= 1.5A C OUT = 10µF R ESR = 0.010Ωgm EA = 60µSMAX1951/MAX19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators______________________________________________________________________________________11gmc = 4.2Sf SWITCH = 1MHzR LOAD = V OUT / I OUT(MAX)= 1.5V / 1.5 A = 1Ωfp MOD = [1 / (2πx C OUT x (R LOAD + R ESR )]= [1 / (2 x π×10 ×10-6x (1 + 0.01)] = 15.76kHz.fz ESR = [1/(2πxC OUT R ESR )]= [1 / (2 x π×10 ×10-6×0.01)] = 1.59MHz.For 2µH output inductor, pick the closed-loop unity-gain crossover frequency (f C ) at 200kHz. Determine the power modulator gain at f C :G MOD(fc )= gmc ×R LOAD ×fp MOD / f C = 4.2 ×1 ×15.76kHz / 200kHz = 0.33then:R 1= V O x K / (gm EA x V FB x G MOD(fc )) = (1.5 x 0.55) /(60 ×10-6 ×0.8 ×0.33) ≈51.1k Ω(1%)C 2= (2 x V OUT ×C OUT ) / (R C ×I OUT(max))= (2 ×1.25 × 10 × 10-6)/ (51.1k ×1.5) ≈209pF, choose 220pF, 10%Applications InformationPC Board Layout ConsiderationsCareful PC board layout is critical to achieve clean and stable operation. The switching power stage requires particular attention. Follow these guidelines for good PC board layout:1)Place decoupling capacitors as close to the IC as possible. Keep power ground plane (connected to PG ND) and signal ground plane (connected to GND) separate.2)Connect input and output capacitors to the power ground plane; connect all other capacitors to the signal ground plane.3)Keep the high-current paths as short and wide as possible. Keep the path of switching current (C1 to IN and C1 to PG ND) short. Avoid vias in the switching paths.4)If possible, connect IN, LX, and PGND separately to a large copper area to help cool the IC to further improve efficiency and long-term reliability.5)Ensure all feedback connections are short and direct. Place the feedback resistors as close to the IC as possible.6)Route high-speed switching nodes away from sensi-tive analog areas (FB, COMP).Thermal ConsiderationsThe MAX1951 uses a fused-lead 8-pin SO package with a R THJC rating of 32°C/W. The MAX1951 EV kit layout is optimized for 1.5A. The typical application circuit shown in Figure 2c was tested with the existing MAX1951 EV kit layout at +85°C ambient temperature, and G ND lead temperature was measured at +113°C for a typical device. The estimated junction temperature was +138°C. Thermal performance can be further improved with one of the following options:1) Increase the copper areas connected to G ND, LX,and IN.2) Provide thermal vias next to G ND and IN, to the ground plane and power plane on the back side of PC board, with openings in the solder mask next to the vias to provide better thermal conduction.3) Provide forced-air cooling to further reduce case temperature.M A X 1951/M A X 19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators 12______________________________________________________________________________________Figure 2a. MAX1951 Adjustable Output Typical Application CircuitFigure 2b. MAX1952 Fixed-Output Typical Application CircuitMAX1951/MAX19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators______________________________________________________________________________________13Figure 2c. MAX1951 Typical Application Circuit with 2A OutputM A X 1951/M A X 19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC Regulators 14______________________________________________________________________________________Chip InformationTRANSISTOR COUNT: 2500PROCESS: BiCMOSMAX1951/MAX19521MHz, All-Ceramic, 2.6V to 5.5V Input,2A PWM Step-Down DC-to-DC RegulatorsMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embod ied in a Maxim prod uct. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________15©2003 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to /packages .)。
MAX9027EBT-T中文资料
MAX9026EBT-T MAX9027EBT-T MAX9028EBT-T
Pin Configurations
TOP VIEW (BUMPS ON BOTTOM) B 1 A VCC
IN+
Selector Guide
PART MAX9025 MAX9026 MAX9027 MAX9028 INTERNAL REFERENCE Yes Yes No No OUTPUT TYPE Push-Pull Open-Drain Push-Pull Open-Drain SUPPLY CURRENT (µA) 1.0 1.0 0.6 0.6
VEE
( ) MAX9027/MAX9028 PINS
UCSP
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at .
MAX9025–MAX9028
OrT TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C BUMPPACKAGE 6 UCSP-6 6 UCSP-6 6 UCSP-6 6 UCSP-6 TOP MARK ADB ADC ADD ADE
ELECTRICAL CHARACTERISTICS—MAX9025/MAX9026 (WITH REF)
各种IC型号及重要参数(精)
导航菜单公司简介公司新闻产品及服务商机信息人才招聘留言反馈深圳市鑫利发电子有限公司『商机信息』商机主题：鑫利发电子供应各种IC电路!供求方向：供应关键字：IC规格：原装数量：0价格：0发布日期：2010-06-11 15:56:24有效日期：2017-04-14 21:37:38阅读次数：2188描述：PIC12C508A 大量现货 DIP8 05/06+PIC12C509A 大量现货 DIP8 05/06+PIC12F508 大量现货 DIP8 05/06+PIC12F629 大量现货 DIP8 05/06+PIC12F675 大量现货 DIP8 05/06+PIC16C54 大量现货 DIP18 05/06+PIC16C57 大量现货 DIP28宽 05/06+PIC16F54 大量现货 DIP18 05/06+PIC16F57 大量现货 DIP28 05/06+PIC16F630 大量现货 DIP14 05/06+PIC16F676 大量现货 DIP14 05/06+PIC16F84A 大量现货 DIP18 05/06+PIC16F628 大量现货 DIP18 05/06+PIC16F628A 大量现货 DIP18 05/06+PIC16F72 大量现货 DIP28窄 05/06+PIC16F73 大量现货 DIP28窄 05/06+2N3904S KEC SOT-23 05/06+2N3906S KEC SOT-23 05/06+MPS8050D KEC TO-92 05/06+MPS8550D KEC TO-92 05/06+KTC9014C KEC TO-92 05/06+KTC9015C KEC TO-92 05/06+KTC8050D KEC TO-92 05/06+2SC1623 NEC L6 05/06+2SC4226 NEC R24/R25 05/06+BAT85 1500 PHILIPS SMD 5BAV199 100000 PHILIPS SOT23 5BAV23 100000 PHILIPS SOT143 05+BAV23S 100000 PHILIPS SOT23 05+BAV70 10000 PHILIPS SOT23 5BAV99 100000 PHILIPS SOT23 5BAW56 800k PHILIPS SOT23 5BB145B 100000 PHILIPS SOD523 05+BB148 100000 PHILIPS SOD323 05+BB149 100000 PHILIPS SOD323 05+BB155 100000 PHILIPS SOD323 05+BB156 100000 PHILIPS SOD323 04+BB187 100000 PHILIPS SOD523 05+BB555 100000 INFINEON SOD323 05+BB804 100000 INFINEON SOD323 05+BC807-16 100000 PHILIPS SOT23 04+BC807-25 100000 PHILIPS SOT23 5BC807-40 100000 PHILIPS SOT23 5BC817-16 100000 PHILIPS SOT23 5BC817-25 100000 PHILIPS SOT23 5BC817-25W 3000 PHILIPS SMD 05+BC817-40 100000 PHILIPS SOT23 5BC817-40W 33000 PHILIPS SMD 05+BC817W 15000 PHILIPS SMD 05+BC846B 10000 PHILIPS SOT23 5BC847A 100000 PHILIPS SOT23 5BC847发送合作加入询盘车返回打印本页深圳市鑫利发电子有限公司技术支持：顶峰商业服务网© 2004-201031157。
MAX629ESA中文资料
ELECTRICAL CHARACTERISTICS
(VCC = +5V, CREF = 0.1µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note1) PARAMETER VCC Input Voltage (Note 2) VCC Supply Current VCC Shutdown Current VCC Undervoltage Lockout Input Supply Voltage (Note 2) SHDN, POL, ISET Logic Levels Positive Output Voltage Negative Output Voltage LX Switch-Current Limit LX On-Resistance LX Leakage Current Maximum LX On-Time POL = GND Minimum LX Off-Time POL = VCC POL = GND, VFB < 1V POL = VCC, VFB > 0.25V POL = GND (positive output) FB Set Point POL = VCC (negative output) FB Input Bias Current REF Output Voltage VCC = 2.7V to 5.5V, no load on REF TA = 0°C to +85°C TA = -40°C to +85°C 1.225 1.218 TA = 0°C to +85°C TA = -40°C to +85°C TA = 0°C to +85°C TA = -40°C to +85°C VFB = 1.3V SHDN = GND 100mV hysteresis Voltage applied to L1 (VIN) VIH VIL Circuit of Figure 2 Circuit of Figure 3 ISET = VCC ISET = GND VCC = 5V VCC = 3.3V VLX = 28V, TA = +85°C 6.5 0.7 2.0 3.0 3.0 1.225 1.218 -15 -25 5 1.250 0 -VIN 0.39 0.20 0.45 0.25 0.6 0.7 0.05 8.5 1.0 3.2 4.5 4.5 1.250 2.3 0.8 2.4 0.4 28 -28 0.51 0.33 1.2 1.4 2.5 10.0 1.3 3.8 6.0 6.0 1.275 1.282 15 25 50 1.275 1.282 V mV nA V µs CONDITIONS MIN 2.7 80 0.04 2.5 TYP MAX 5.5 120 1 2.65
MAX1680ESA+T中文资料
PART MAX1680C/D MAX1680ESA MAX1681C/D MAX1681ESA
TEMP. RANGE 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C
*Contact factory for dice specifications.
Note 1: Shorting OUT to IN may damage the device and should be avoided.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2.0
MAX1681
3.0
MAX1680
2.5
MAX1681
4.0
5.5 5.5
V 5.5
V 5.5
Supply Current
MAX1680 I+
MAX1921EUT25+T中文资料
元器件交易网
Low-Voltage, 400mA Step-Down DC-DC Converters in SOT23 MAX1920/MAX1921
ABSOLUTE MAXIMUM RATINGS
IN, FB, SHDN to AGND . . . . . . . . . . . . . . . . . . . . .-0.3V to +6V OUT to AGND, LX to PGND . . . . . . . . . . . .-0.3V to (IN + 0.3V) AGND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to +0.3V OUT Short Circuit to GND . . . . . . . . . . . . . . . . . . . . . . . . . . .10s Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) . . . .695mW 6-Pin TDFN (derate 18.2mW/°C above +70°C) . . .1454.5mW Operating Temperature Range . . . . . . . . . . . . . .-40°C to +85°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C Storage Temperature . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Lead Temperature (soldering 10s) . . . . . . . . . . . . . . . . .+300°C
MAX2606EUT中文资料
元器件交易网
45MHz to 650MHz, Integrated IF VCOs with Differential Output MAX2605–MAX2609
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...................................................................................................-0.6V to (VCC + 0.3V) TUNE to GND .............................................-0.3V to (VCC + 0.3V) OUT+, OUT- to GND ..................................-0.3V to (VCC + 0.6V) Continuous Power Dissipation (TA = +85°C) 6-Pin SOT23 (derate 8.7mW/°C above +70°C) ...........696mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C
MAX1236KEUA+中文资料
Features
♦ High-Speed I2C-Compatible Serial Interface ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ 400kHz Fast Mode 1.7MHz High-Speed Mode Single-Supply 2.7V to 3.6V (MAX1237/MAX1239) 4.5V to 5.5V (MAX1236/MAX1238) Internal Reference 2.048V (MAX1237/MAX1239) 4.096V (MAX1236/MAX1238) External Reference: 1V to VDD Internal Clock 4-Channel Single-Ended or 2-Channel Fully Differential (MAX1236/MAX1237) 12-Channel Single-Ended or 6-Channel Fully Differential (MAX1238/MAX1239) Internal FIFO with Channel-Scan Mode Low Power 670µA at 94.4ksps 230µA at 40ksps 60µA at 10ksps 6µA at 1ksps 0.5µA in Power-Down Mode Software-Configurable Unipolar/Bipolar Small Packages 8-Pin µMAX (MAX1236/MAX1237) 16-Pin QSOP (MAX1238/MAX1239)
元器件交易网
19-2333; Rev 4; 9/06
2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
MAX6033规格书,MAX6033AAUT50技术资料,MAX6033AAUT25,datasheet,PDF
General DescriptionThe MAX6033 ultra-high-precision series voltage refer-ence features a low 7ppm/°C (max) temperature coeffi-cient and a low dropout voltage (200mV, max). Low temperature drift and low noise make the MAX6033ideal for use with high-resolution ADCs or DACs.This device uses bandgap technology for low-noise per-formance and excellent accuracy. Laser-trimmed, high-stability, thin-film resistors, and postpackage trimming guarantee excellent initial accuracy (±0.04%, max). The MAX6033 consumes only 40µA of supply current and sources up to 15mA. Series mode references save sys-tem power and use minimal external components com-pared to two-terminal shunt references.The MAX6033 is available in the miniature 6-pin SOT23package and is offered over the automotive tempera-ture range (-40°C to +125°C).ApplicationsPrecision Regulators A/D and D/A Converters Power Supplies Hard-Disk DrivesHigh-Accuracy Industrial and Process Control Hand-Held InstrumentsFeatureso Tiny 6-Pin SOT23 Packageo Ultra-Low Temperature Drift: 7ppm/°C (max)o ±0.04% Initial Accuracy o Stable with Capacitive Loadso Low 16µV P-P Noise (0.1Hz to 10Hz) (2.5V Output)o 15mA Output Source Current o Low 200mV Dropout Voltage o Low 40µA Quiescent Current o Wide 2.7V to 12.6V Supply Voltage o Excellent Load Regulation: 0.001mV/mAMAX6033Ultra-High-Precision SOT23 SeriesVoltage Reference________________________________________________________________Maxim Integrated Products 1Selector GuidePin ConfigurationOrdering InformationTypical Operating Circuit19-2300; Rev 2; 6/03For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Note:Two-number part suffix indicates output voltage option.SOT23 Package Top Marks appear at end of data sheet.M A X 6033Ultra-High-Precision SOT23 Series Voltage ReferenceABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS —V OUT = 2.500V(V IN = 5V, C OUT = 0.1µF, I OUT = 0, T A = T MIN to T MAX , unless otherwise specified. Typical values are at T A = +25°C.) (Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.IN to GND...............................................................-0.3V to +13V OUTF, OUTS to GND................................................-0.3V to +6V Continuous Power Dissipation (T A = +70°C)6-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mWOperating Temperature Range .........................-40°C to +125°C Storage Temperature Range.............................-65°C to +150°C Maximum Junction Temperature.....................................+150°C Lead Temperature (soldering, 10s).................................+300°CMAX6033Ultra-High-Precision SOT23 SeriesVoltage Reference_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS —V OUT = 3.000V(V IN = 5V, C OUT = 0.1µF, I OUT = 0, T A = T MIN to T MAX , unless otherwise specified. Typical values are at T A = +25°C.) (Note 1)ELECTRICAL CHARACTERISTICS —V OUT = 4.096VM A X 6033Ultra-High-Precision SOT23 Series Voltage ReferenceELECTRICAL CHARACTERISTICS —V OUT = 4.096V (continued)(V IN = 5V, C OUT = 0.1µF, I OUT = 0, T A = T MIN to T MAX , unless otherwise specified. Typical values are at T A = +25°C.) (Note 1)ELECTRICAL CHARACTERISTICS —V OUT = 5.000V(V = 5.5V, C = 0.1µF, I = 0, T = T to T , unless otherwise specified. Typical values are at T = +25°C.) (Note 1)MAX6033Ultra-High-Precision SOT23 SeriesVoltage Reference_______________________________________________________________________________________5ELECTRICAL CHARACTERISTICS —V OUT = 5.000V (continued)Typical Operating Characteristics(V IN = 5V, C OUT = 0.1µF, I OUT = 0, T A = +25°C, unless otherwise specified.) (Note 4)Note 2:Dropout Voltage is the minimum input voltage at which V OUT changes ≤0.1% from V OUT at V IN = 5V (V IN = 5.5V forV OUT = 5V).Note 3:Temperature Hysteresis is defined as the change in +25°C output voltage before and after cycling the devicefrom T MAX to T MIN .OUTPUT VOLTAGE vs.TEMPERATURE (V OUT = 2.5V)TEMPERATURE (°C)O U T P U T V OL T A G E (V )110956580-105203550-252.49822.49842.49862.49882.49902.49922.49942.49962.49982.50002.50022.50042.50062.50082.50102.4980-40125OUTPUT VOLTAGE vs.TEMPERATURE (V OUT = 5V)TEMPERATURE (°C)O U T P U T V O L T A G E (V )110956580-105203550-254.99824.99844.99864.99884.99904.99924.99944.99964.99985.00005.00025.00045.00065.00085.00104.9980-40125LOAD REGULATION (V OUT = 2.5V)OUTPUT CURRENT (mA)O U T P U T V O L T A G E (V )1816121424681002.49952.50002.50052.50102.50152.50202.50252.50302.50352.50402.4990-220M A X 6033Ultra-High-Precision SOT23 Series Voltage Reference 6_______________________________________________________________________________________Typical Operating Characteristics (continued)(V IN = 5V, C OUT = 0.1µF, I OUT = 0, T A = +25°C, unless otherwise specified.) (Note 4)LOAD REGULATION (V OUT = 5V)OUTPUT CURRENT (mA)O U T P U T V O L T A G E (V )1816024810126144.9995.0005.0015.0025.0035.0045.0055.0064.998-220DROPOUT VOLTAGE vs. OUTPUT CURRENT(V OUT = 2.5V)OUTPUT CURRENT (mA)D R O P O U T V O L T A GE (m V )181********6421002003004005006007000020DROPOUT VOLTAGE vs. OUTPUT CURRENT(V OUT = 5V)OUTPUT CURRENT (mA)D R O P O U T V O L T A GE (m V )18161214468102501001502002503003504004505005506000020POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (V OUT = 2.5V)FREQUENCY (kHz)0.0011101000.010.11000P S R R (d B )0-100-90-80-70-60-50-40-10-20-30-100-70-80-90-60-50-40-30-20-1000.0010.10.011101001000POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (V OUT = 5V)M A X 6033 t o c 08FREQUENCY (kHz)P S R R (d B )SUPPLY CURRENT vs. INPUT VOLTAGE(V OUT = 2.5V)INPUT VOLTAGE (V)S U P P L Y C U R R E N T (µA )121191034567812153045607590105120135150013SUPPLY CURRENT vs. INPUT VOLTAGE(V OUT = 5V)INPUT VOLTAGE (V)S U P P L Y C U R R E N T (µA )121191034567812204060801001201401601802002200130.1Hz TO 10Hz OUTPUT NOISE(V OUT = 2.5V)MAX6033 toc11V OUT 4µV/div 1s/div 0.1Hz TO 10Hz OUTPUT NOISE(V OUT = 5V)MAX6033 toc12V OUT 10µV/div1s/divMAX6033Ultra-High-Precision SOT23 SeriesVoltage Reference_______________________________________________________________________________________7LOAD TRANSIENT (V OUT = 2.5V)2.5V10mAI OUT10mA/divV OUT 50mV/div AC-COUPLED400µs/divV IN = 5V C OUT = 0.1µFLOAD TRANSIENT (V OUT = 2.5V)2.5V-100µA1mA 1ms/divI OUT 1mA/divV OUT 50mV/div AC-COUPLEDV IN = 5V C OUT = 0.1µFLOAD TRANSIENT (V OUT = 2.5V)MAX6033 toc152.5V10mAI OUT10mA/divV OUT 50mV/div AC-COUPLED400µs/divV IN = 5V C OUT = 10µFLOAD TRANSIENT (V OUT = 2.5V)MAX6033 toc162.5V-100µA1mAI OUT 1mA/divV OUT 20mV/div AC-COUPLED1ms/divV IN = 5V C OUT = 10µFLINE TRANSIENT (V OUT = 2.5V)MAX6033 toc175.5V2.5V4.5V VOUT 10mV/div AC-COUPLEDV IN500mV/div AC-COUPLED400µs/div C OUT = 0.1µFLINE TRANSIENT (VOUT = 5V)6.5V5V5.5VV OUT 10mV/div AC-COUPLEDV IN500mV/div AC-COUPLED1ms/divTypical Operating Characteristics (continued)(V IN = 5V, C OUT = 0.1µF, I OUT = 0, T A = +25°C, unless otherwise specified.) (Note 4)M A X 6033Ultra-High-Precision SOT23 Series Voltage Reference 8_______________________________________________________________________________________Typical Operating Characteristics (continued)(V IN = 5V, C OUT = 0.1µF, I OUT = 0, T A = +25°C, unless otherwise specified.) (Note 4)TURN-ON TRANSIENT (V OUT = 2.5V)5V2.5VV OUT 1V/divV IN 2V/div100µs/div0C OUT = 0.1µFTURN-ON TRANSIENT(V OUT = 5V)MAX6033 toc205.5V5VV OUT 2V/divV IN 2V/div400µs/divC OUT = 0.1µFTURN-ON TRANSIENT (V OUT = 2.5V)5V2.5VV OUT 1V/divV IN 2V/div2ms/divC OUT = 10µFTURN-ON TRANSIENT(V OUT = 5V)5.5V5VV OUT 2V/divV IN 2V/div2ms/divC OUT = 10µFNote 4:Many of the MAX6033 Typical Operating Characteristics are similar. The extremes of these characteristics are found in theMAX6033 (2.5V output) and the MAX6033 (5V output). The Typical Operating Characteristics of the remainder of the MAX6033 family typically lie between these two extremes and can be estimated based on their output voltages.LONG-TERM STABILITY vs. TIME(V OUT = 2.5V)TIME (HOURS)V O U T (V )9008006007002003004005001002.499952.500002.500052.500102.500152.500202.500252.500302.500352.500402.4999001000LONG-TERM STABILITY vs. TIME(V OUT= 5V)TIME (HOURS)V O U T (V )9008006007002003004005001005.00005.00015.00025.00035.00045.00055.00065.00075.00085.00094.999901000Applications InformationBypassing/Load CapacitanceFor the best line-transient performance, decouple the input with a 0.1µF ceramic capacitor as shown in the Typical Operating Circuit . Place the capacitor as close to I N as possible. When transient performance is less important, no capacitor is necessary.The MAX6033 family requires a minimum output capac-itance of 0.1µF for stability and is stable with capacitive loads (including the bypass capacitance) of up to 100µF. In applications where the load or the supply can experience step changes, a larger output capacitor reduces the amount of overshoot (undershoot) and improves the circuit ’s transient response. Place output capacitors as close to the device as possible.Supply CurrentThe quiescent supply current of the MAX6033 series reference is typically 40µA and is virtually independent of the supply voltage. In the MAX6033 family, the load current is drawn from the input only when required, so supply current is not wasted and efficiency is maxi-mized at all input voltages. This improved efficiency reduces power dissipation and extends battery life.When the supply voltage is below the minimum-speci-fied input voltage (as during turn-on), the devices can draw up to 150µA beyond the nominal supply current.The input voltage source must be capable of providing this current to ensure reliable turn-on.Output-Voltage HysteresisOutput voltage hysteresis is the change in the output voltage at T A = +25°C before and after the device is cycled over its entire operating temperature range.Hysteresis is caused by differential package stress appearing across the bandgap core transistors. The typical temperature hysteresis value is 150ppm.Turn-On TimeThese devices typically turn on and settle to within0.01% of their final value in >1µs. The turn-on time can increase up to 2ms with the device operating at the minimum dropout voltage and the maximum load.Precision Current SourceFigure 1 shows a typical circuit providing a precision current source. The OUTF output provides the bias cur-rent for the bipolar transistor. OUTS senses the voltage across the resistor and adjusts the current sourced by OUTF accordingly.High-Resolution DAC and Reference from Single SupplyFigure 2 shows a typical circuit providing both the power supply and reference for a high-resolution DAC.A MAX6033 with 2.5V output provides the reference voltage for the DAC.MAX6033Ultra-High-Precision SOT23 SeriesVoltage Reference_______________________________________________________________________________________9Figure 1. Precision Current SourceM A X 6033Ultra-High-Precision SOT23 Series Voltage Reference 10______________________________________________________________________________________Chip InformationTRANSISTOR COUNT: 656PROCESS: BiCMOSSOT23 Package Top MarksMAX6033Ultra-High-Precision SOT23 Series Voltage ReferenceMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embod ied in a Maxim prod uct. No circuit patent licenses areimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________11©2003 Maxim Integrated Products Printed USAis a registered trademark of Maxim Integrated Products.Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline informationgo to /packages .)美信代理商,MAXIM 代理,深圳市万瑞尔科技有限公司 +86-755-28269789 。
MAXIM MAX8725 说明书
____________________________________概述MAX8725评估板(EV kit) 是高精度、高效率的多化学类型电池充电器。
该评估板能够以高达3A的电流为三至四节串联的锂离子电池(Li+) 充电。
充电电流和输入电源电流通过板上电位器调节。
输出电压可设置为4.2V x 电池包中串联电池节数。
串联电池节数由跳线选择。
通过安装两个电阻，输出电压可在4V至4.4V x (串联电池节数)之间调节。
该评估板还提供用于监视AC适配器电流的输出，并可监视是否连接了AC适配器。
MAX8725通过控制两个外部p沟道MOSFET自动选择系统供电电源。
决定选择哪一路电源供电的依据是：是否连接了AC适配器。
____________________________________特性♦输入限流♦利用内部基准提供±0.5%的电压检测精度♦自动选择系统电源♦模拟输入控制充电电流和充电电压♦监视输出AC适配器电源电流AC适配器是否接通♦电池电压高达17.6V ♦+8V至+25V输入电压♦电池充电电流高达3A♦可为Li+、NiCd和NiMH电池充电♦表贴封装♦经过完全安装和测试评估板：MAX8725MAX8725评估板Maxim Integrated Products 119-0292; Rev 0; 5/05本文是Maxim正式英文资料的译文，Maxim不对翻译中存在的差异或由此产生的错误负责。
请注意译文中可能存在文字组织或翻译错误，如需确认任何词语的准确性，请参考Maxim提供的英文版资料。
索取免费样品和最新版的数据资料，请访问Maxim的主页：。
评估板：M A X 8725MAX8725评估板2_______________________________________________________________________________________评估板：MAX8725MAX8725评估板_______________________________________________________________________________________3________________________________快速入门所需设备在开始评估之前，需要准备以下设备：•为充电器提供输入电流的DC电源，该电源电压必须大于电池电压设置点，并具有足够大的额定电流•电压表•电池包或负载步骤MAX8725评估板是经过完全安装与测试的表贴电路板。
瑞特拉电子产品购买指南说明书
241For additional technical information visit Metric measurements for this product are exact, imperial measurements are rounded to the nearest whole numberUseful Cooling Capacity: 2400 - 5794 BTU (703 - 1697 W)Part No. with basic controller 3303.1042)3303.1142)3304.1043304.1143304.1443305.1043305.1143305.144Part No. with comfort controller 3303.5042)3303.5142)3304.5043304.5143304.5443305.5043305.5143305.544Voltage V , Hz230, 50/60115, 60230, 50/60115, 60400, 50/ 460, 60, 3~230, 50/60115, 60400, 50/ 460, 60, 3~Dimensions inches (mm)H x W x D24 x 11 x 12 (620 x 285 x 298)40 x 16 x 14 (1020 x 405 x 358)Useful cooling capacity Q KBTU (W)T i 131 T a 1312400 (703)3916 (1147)5794 (1697)Useful cooling capacity Q K to DIN 3168 BTU (W)T i 95 T a 951708/2083(500/610)1708 (500)3415/3620 (1000/1060)5123/5157 (1500/1510)T i 95 T a 122956/1195(280/350)956 (280)2698/2869 (790/840)4201/4269 (1230/1250)Rated current maximum 2.6/2.6 A 5.7 A 5.4/5.0 A 10.6/11.1 A 2.8/2.9 A 6.0/6.5 A 12.1/13.6 A 2.6/2.9 A Starting current 5.1/6.4 A 11.5 A 12.0/14.0 A 26.0/28.0 A 11.5/12.7 A 22.0/24.0 A 42.0/46.0 A 12.2/11.3 A Pre-fuse T 10.0 A 10.0 A 10.0 A 16.0 A 10.0 A 1)16.0 A 20.0 A 10.0 A 1)Power consumption Pel toDIN 3168T i 95 T a 95360/380 W 470 W 700/650 W 725/680 W 580/550 W 850/1000 W 880/1050 W 800/980 W T i 95 T a 122420/390 W500 W 750/710 W 780/750 W 660/680 W 1000/1160 W 1040/1200 W 960/1150 W Cooling coefficient j =Q K /PelT i 95 T a 95 1.4 1.7 1.8 1.7 1.9Refrigerant R134a, 6.0 oz (170 g)R134a, 17.6 oz (500 g)R134a, 21.1 oz (600 g)Maximum allowable operating pressure 406 psi (28 bar)363 psi (25 bar)Temperature and setting range Comfort Controller - 68 to 131° F (+20 to +55° C) / Basic Controller - 86 to 131° F (+30 to +55° C)Environmental ratings UL Type 4X (IP 66)Duty cycle 100%Type of connection Plug-in terminal strip Weight lb (kg)55.1 (25)108.2 (49)119.0 (54)110.2 (50)112.4 (51)123.5 (56)114.6 (52)Material Type 304 stainless steelAir displacement offans External circuit 203 cfm (345 m 3/h)530 cfm (900 m 3/h)530 cfm (900 m 3/h)Internal circuit 182 cfm (310 m 3/h)353 cfm (600 m 3/h)471 cfm (800 m 3/h)Temperature control Basic or comfort controller (factory setting 95° F [+35° C])Accessories PU Page Door-operated switch 14127.010–Master/slave cable for comfortcontroller13124.100–3124.100267RiDiag II including cables for comfortcontroller13159.100267Interface card for comfort controller 13124.200268Condensate hose 13301.6103301.6122731) Motor circuit breaker. 2)Internal condensate evaporator not included. Special voltages and technical modifications available on request.Wallmounted UL T ype 4X Air ConditionerCon guration:Fully wired ready for connection, including drilling template and assembly parts. With nano-coated condenser and integrated condensate evaporator.Protection Ratings:UL and cUL recognized, CSA UL Type 4XUL file: SA8250 Material:Type 304 stainless steel Note:Air conditioner with comfortcontroller may be integrated into a monitoring system with an optional interface card 3124.20 (RS 232, RS 485, RS 422 and PLC interface). See page 268. Made in the USA.000C o u r t e s y o f C M A /F l o d y n e /H y d r a d y n e ŀ M o t i o n C o n t r o l ŀ H y d r a u l i c ŀ P n e u m a t i c ŀ E l e c t r i c a l ŀ M e c h a n i c a l ŀ (800) 426-5480 ŀ w w w .c m a f h .c o242For additional technical information visit Metric measurements for this product are exact, imperial measurements are rounded to the nearest whole numberUseful Cooling Capacity: 8706 - 10525 BTU (2550 - 3083 W)Part No. with basic controller 3328.1043328.1143328.1443329.1043329.1143329.144Part No. with comfort controller 3328.5043328.5143328.5443329.5043329.5143329.544Rated operating voltage V , Hz 230, 50/60115, 50/60400, 50/460, 60, 3~230, 50/60115, 50/60400, 50/460, 60, 3~Dimensions inches (mm)H x W x D 65 x 16 x 15 (1650 x 405 x 388)Useful cooling capacity Q K BTU (W)T i 131 T a 1318706 (2550)10525 (3083)Useful cooling capacity Q K to DIN 3168 BTU (W)T i 95 T a 956860/8025 (2000/2350)8538/9392 (2500/2750)T i 95 T a 1224952/5772 (1450/1690)5464/5977 (1600/1750)Rated current max. 7.5 A/9.1 A 14.7 A/17.3 A 2.8 A/3.3 A 8.6 A/10.6 A 17.0 A/22.0 A 3.7 A/3.8 A Start-up current 22.0 A/26.0 A36.0 A/39.0 A6.8 A/7.8 A 21.0 A/21.0 A44.0 A/42.0 A6.8 A/7.6 A Pre-fuse T16.0 A25.0 A 10.0A/10.0 A 1)16.0 A 25.0 A 10.0 A/10.0 A 1)Power consumption Pel to DIN 3168 T i 95 T a 951025/1200 W 1085/1250 W 1050/1275 W 1450/1675 W 1500/1725 W 1425/1625 W T i 95 T a 1221250/1350 W1300/1410 W1275/1525 W1625/2000 W1675/2065 W1675/1975 WCooling coefficient j = Q K /Pel T i 95 T a 951.72.31.92.0RefrigerantR134a, 31.7 oz (900 g)Maximum allowable operating pressure 406 psi (28 bar)Temperature and setting range Comfort Controller - 68 to 131° F (+20 to +55° C) / Basic Controller - 86 to 131° F (+30 to +55° C)Protection rating UL Type 4X (IP 66)Duty cycle 100%Type of connection Plug-in terminal stripWeight lb (kg)176.4 (80)191.8 (87)176.4 (80)183.0 (83)198.4 (90)183.0 (83)MaterialType 304 stainless steelAir displacement of fans External circuit 377 cfm (640 m 3/h)418 cfm (710 m 3/h)Internal circuit324 cfm (550 m 3/h)377 cfm (640 m 3/h)Temperature control Basic or comfort controller (factory setting 95° F [+35° C])Accessories PU Page Door-operated switch14127.010–Master/slave cable for comfort controller13124.100267RiDiag II including cables for comfort controller 13159.100267Interface card for comfort controller 13124.200268Condensate hose13301.6122731)Motor circuit breaker. Special voltages available on request. We reserve the right to make technical modifications.Wallmounted UL T ype 4X Air ConditionerCon guration:Fully wired ready for connection, including drilling template and assembly parts. With nano-coated condenser and integrated condensate evaporator.Protection Ratings: UL and cUL recognized UL Type 4X UL file: SA8250Material:Type 304 stainless steelNote:Air conditioner with comfortcontroller may be integrated into a monitoring system with an optional interface card 3124.200(RS 232, RS 485, RS 422 and PLC interface). See page 268. Made in the USA.C o u r t e s y o f C M A /F l o d y n e /H y d r a d y n e ŀ M o t i o n C o n t r o l ŀ H y d r a u l i c ŀ P n e u m a t i c ŀ E l e c t r i c a l ŀ M e c h a n i c a l ŀ (800) 426-5480 ŀ w w w .c m a f h .c o。
MAX3490EESA+T中文资料
General DescriptionDevices in the MAX3483E family (MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E) are ±15kV ESD-protected, +3.3V, low-power transceivers for RS-485 and RS-422 communications. Each device con-tains one driver and one receiver. The MAX3483E and MAX3488E feature slew-rate-limited drivers that minimize EMI and reduce reflections caused by improperly termi-nated cables, allowing error-free data transmission at data rates up to 250kbps. The partially slew-rate-limited MAX3486E transmits up to 2.5Mbps. The MAX3485E,MAX3490E, and MAX3491E transmit at up to 12Mbps.All devices feature enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge, and ±15kV using the Human Body Model.Drivers are short-circuit current limited and are protect-ed against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if both inputs are open circuit.The MAX3488E, MAX3490E, and MAX3491E feature full-duplex communication, while the MAX3483E,MAX3485E, and MAX3486E are designed for half-duplex communication.ApplicationsTelecommunicationsIndustrial-Control Local Area Networks Transceivers for EMI-Sensitive Applications Integrated Services Digital Networks Packet SwitchingFeatureso ESD Protection for RS-485 I/O Pins±15kV—Human Body Model±8kV—IEC 1000-4-2, Contact Discharge ±15kV—IEC 1000-4-2, Air-Gap Discharge o Operate from a Single +3.3V Supply—No Charge Pump Required o Interoperable with +5V Logic o Guaranteed 12Mbps Data Rate (MAX3485E/MAX3490E/MAX3491E)o Slew-Rate Limited for Errorless Data Transmission (MAX3483E/MAX3488E) o 2nA Low-Current Shutdown Mode(MAX3483E/MAX3485E/MAX3486E/MAX3491E)o -7V to +12V Common-Mode Input Voltage Range o Full-Duplex and Half-Duplex Versions Available o Industry-Standard 75176 Pinout (MAX3483E/MAX3485E/MAX3486E)o Current-Limiting and Thermal Shutdown for Driver Overload ProtectionMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers________________________________________________________________Maxim Integrated Products119-1474; Rev 0; 4/99Selector GuideOrdering InformationOrdering Information continued at end of data sheet.For free samples & the latest literature: , or phone 1-800-998-8800.For small orders, phone 1-800-835-8769.M A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceiversABSOLUTE MAXIMUM RATINGSDC ELECTRICAL CHARACTERISTICS(V = +3.3V ±0.3V, T = T to T , unless otherwise noted. Typical values are at T = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Supply Voltage (V CC ).............................................................+7V Control Input Voltage (RE , DE).................................-0.3V to +7V Driver Input Voltage (DI)...........................................-0.3V to +7V Driver Output Voltage (A, B, Y, Z).......................-7.5V to +12.5V Receiver Input Voltage (A, B)..............................-7.5V to +12.5V Receiver Output Voltage (RO)....................-0.3V to (V CC + 0.3V)Continuous Power Dissipation (T A = +70°C)8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C).....727mW14-Pin SO (derate 8.33mW/°C above +70°C)................667mW 14-Pin Plastic DIP (derate 10mW/°C above +70°C)......800mW Operating Temperature RangesMAX34_ _ EC_ _...................................................0°C to +70°C MAX34_ _ EE_ _.................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10sec).............................+300°CMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceiversDC ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.3V ±0.3V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)DRIVER SWITCHING CHARACTERISTICS—MAX3485E/MAX3490E/MAX3491E(V = +3.3V, T = +25°C.)DRIVER SWITCHING CHARACTERISTICS—MAX3486E(V = +3.3V, T = +25°C.)*MAX3488E and MAX3491E will be compliant to ±8kV per IEC 1000-4-2 Contact Discharge by September 1999.M A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers4_______________________________________________________________________________________DRIVER SWITCHING CHARACTERISTICS—MAX3483E/MAX3488E(V CC = +3.3V, T A = +25°C.)RECEIVER SWITCHING CHARACTERISTICS(V CC = +3.3V, T A = +25°C.)Note 1:∆V OD and ∆V OC are the changes in V OD and V OC , respectively, when the DI input changes state.Note 2:Measured on |t PLH (Y) - t PHL (Y)|and |t PLH (Z) - t PHL (Z)|.Note 3:The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns, thedevices are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the devices are guaranteed to have entered shutdown. See Low-Power Shutdown Mode section.MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers_______________________________________________________________________________________5Typical Operating Characteristics(V CC = +3.3V, T A = +25°C, unless otherwise noted.)252015105000.51.01.52.02.53.53.0OUTPUT CURRENT vs.RECEIVER OUTPUT LOW VOLTAGEM A X 3483E -01OUTPUT LOW VOLTAGE (V)O U T P U T C U R R E N T (m A )-20-18-16-14-12-10-8-6-4-2000.51.01.52.02.53.53.0OUTPUT CURRENT vs.RECEIVER OUTPUT HIGH VOLTAGEM A X 3483E -02OUTPUT HIGH VOLTAGE (V)O U T P U T C U R R E N T (m A )3.003.053.103.153.203.253.30-40-20020406010080RECEIVER OUTPUT HIGH VOLTAGEvs. TEMPERATURETEMPERATURE (°C)O U T P U T H I G H V O L T A G E (V )00.10.20.30.40.50.60.70.8-40-2020406010080RECEIVER OUTPUT LOW VOLTAGEvs. TEMPERATURETEMPERATURE (°C)O U T P U T L O W V O L T A G E (V )2505075100125150175024681012OUTPUT CURRENT vs.DRIVER OUTPUT LOW VOLTAGEM A X 3483E -07OUTPUT LOW VOLTAGE (V)O U T P U T C U R R E N T (m A )100908070605040302010000.5 1.0 1.5 2.0 2.5 3.53.0DRIVER OUTPUT CURRENT vs.DIFFERENTIAL OUTPUT VOLTAGEM A X 3483E -05DIFFERENTIAL OUTPUT VOLTAGE (V)O U T P U T C U R R E N T (m A )1.61.71.81.92.02.12.22.32.42.62.5-40-20020406010080DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURETEMPERATURE (°C)D I F FE R E N T I A L O U T P U T V O L T A G E (V )-100-80-60-40-20543210-7-6-3-4-5-2-1OUTPUT CURRENT vs.DRIVER OUTPUT HIGH VOLTAGEM A X 3483E -08OUTPUT HIGH VOLTAGE (V)O U T P U T C U R R E N T (m A )M A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers0.80.70.91.01.11.2-40-2020406010080SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (m A )Typical Operating Characteristics (continued)(V CC = +3.3V, T A = +25°C, unless otherwise noted.)0102030405060708010090-40-2020406010080SHUTDOWN CURRENT vs. TEMPERATUREM A X 3483E -10TEMPERATURE (°C)S H U T D O W N C U R R E N T (n A )Pin DescriptionMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers_______________________________________________________________________________________7Figure 2. MAX3488E/MAX3490E Pin Configuration and Typical Operating CircuitFigure 3. MAX3491E Pin Configuration and Typical Operating CircuitFigure 1. MAX3483E/MAX3485E/MAX3486E Pin Configuration and Typical Operating CircuitM A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers8_______________________________________________________________________________________Figure 4. Driver V OD and V OC Figure 7. Driver Differential Output Delay and Transition TimesFigure 6. Receiver V OH and V OLFigure 5. Driver V OD with Varying Common-Mode VoltageMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers_______________________________________________________________________________________9Figure 8. Driver Propagation TimesFigure 9. Driver Enable and Disable Times (t PZH , t PSH , t PHZ )Figure 10. Driver Enable and Disable Times (t PZL , t PSL , t PLZ )M A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers10______________________________________________________________________________________Figure 11. Receiver Propagation DelayFigure 12. Receiver Enable and Disable TimesNote 4: The input pulse is supplied by a generator with the following characteristics: f = 250kHz, 50% duty cycle, t r ≤6.0ns, Z O = 50Ω.Note 5: C L includes probe and stray capacitance._____________________Function TablesDevices with Receiver/Driver Enable(MAX3483E/MAX3485E/MAX3486E/MAX3491E)Table 1. Transmitting* B and A outputs are Z and Y, respectively, for full-duplex part (MAX3491E).X = Don’t care; High-Z = High impedanceTable 2. Receiving* DE is a “don’t care” (x) for the full-duplex part (MAX3491E).X = Don’t care; High-Z = High impedanceDevices without Receiver/Driver Enable(MAX3488E/MAX3490E)Table 3. TransmittingTable 4. Receiving___________Applications InformationThe MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E are low-power transceivers for RS-485 and RS-422 communications. The MAX3483E and MAX3488E can transmit and receive at data rates up to 250kbps, the MAX3486E at up to 2.5Mbps, and the MAX3485E/MAX3490E/MAX3491E at up to 12Mbps. The MAX3488E/MAX3490E/MAX3491E are full-duplex trans-ceivers, while the MAX3483E/MAX3485E/MAX3486E are half-duplex. Driver Enable (DE) and Receiver Enable (RE ) pins are included on the MAX3483E/MAX3485E/MAX3486E/MAX3491E. When disabled, the driver and receiver outputs are high impedance.Reduced EMI and Reflections (MAX3483E/MAX3486E/MAX3488E)The MAX3483E/MAX3488E are slew-rate limited, mini-mizing EMI and reducing reflections caused by improp-erly terminated cables. Figure 13 shows the driver output waveform of a MAX3485E/MAX3490E/MAX3491E transmitting a 125kHz signal, as well as the Fourier analysis of that waveform. High-frequency harmonics with large amplitudes are evident. Figure 14 shows the same information, but for the slew-rate-limited MAX3483E/MAX3488E transmitting the same signal. The high-frequency harmonics have much lower amplitudes,and the potential for EMI is significantly reduced.Low-Power Shutdown Mode(MAX3483E/MAX3485E/MAX3486E/MAX3491E)A low-power shutdown mode is initiated by bringing both RE high and DE low. The devices will not shut down unless both the driver and receiver are disabled (high impedance). In shutdown, the devices typically draw only 2nA of supply current.For these devices, the t PSH and t PSL enable times assume the part was in the low-power shutdown mode;the t PZH and t PZL enable times assume the receiver or driver was disabled, but the part was not shut down.MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers______________________________________________________________________________________11INPUTS OUTPUT A, B RO ≥+0.2V 1≤-0.2V 0Inputs Open1INPUT OUTPUTS DI Z Y 101015MHz 500kHz/div 05MHz500kHz/div Figure 13. Driver Output Waveform and FFT Plot of MAX3485E/MAX3490E/MAX3491E Transmitting a 125kHz Signal Figure 14. Driver Output Waveform and FFT Plot of MAX3483E/ MAX3488E Transmitting a 125kHz SignalM A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers12______________________________________________________________________________________Figure 17. MAX3483E/MAX3488E Driver Propagation Delay Figure 19. MAX3483E/MAX3488E System Differential Voltage at 125kHz Driving 4000 Feet of Cable Figure 20. MAX3485E/MAX3490E/MAX3491E System Differential Voltage at 125kHz Driving 4000 Feet of CableDriver-Output Protection Excessive output current and power dissipation caused by faults or by bus contention are prevented by two mechanisms. A foldback current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see Typical Operating Characteristics). In addition, a thermal shut-down circuit forces the driver outputs into a high-imped-ance state if the die temperature rises excessively.Propagation Delay Figures 15–18 show the typical propagation delays. Skew time is simply the difference between the low-to-high and high-to-low propagation delay. Small driver/receiver skew times help maintain a symmetrical mark-space ratio (50% duty cycle).The receiver skew time, |t PRLH- t PRHL|, is under 10ns (20ns for the MAX3483E/MAX3488E). The driver skew times are 8ns for the MAX3485E/MAX3490E/MAX3491E, 12ns for the MAX3486E, and typically under 50ns for the MAX3483E/MAX3488E.Line Length vs. Data Rate The RS-485/RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet, see Figure 21 for an example of a line repeater.Figures 19 and 20 show the system differential voltage for parts driving 4000 feet of 26AWG twisted-pair wire at 125kHz into 120Ωloads.For faster data rate transmission, please consult the fac-tory.±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX3483E family of devices have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup or damage.ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits:1)±15kV using the Human Body Model2)±8kV using the Contact-Discharge method specifiedin IEC 1000-4-23)±15kV using IEC 1000-4-2’s Air-Gap method.ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results.Human Body Model Figure 22a shows the Human Body Model and Figure 22b shows the current waveform it generates when dis-charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of inter-est, which is then discharged into the test device through a 1.5kΩresistor.IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifi-cally refer to integrated circuits. The MAX3483E family of devices helps you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2, without the need for additional ESD-protection components.The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD with-stand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 23a shows the IEC 1000-4-2 model, and Figure 23b shows the current waveform for the ±8kV IEC 1000-4-2, Level 4 ESD contact-discharge test.Figure 21. Line Repeater for MAX3488E/MAX3490E/MAX3491EMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers ______________________________________________________________________________________13M A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491EThe air-gap test involves approaching the device with a charged probe. The contact-discharge method connects the probe to the device before the probe is energized.Machine ModelThe Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resis-tance. Its objective is to emulate the stress caused when I/O pins are contacted by handling equipment during test and assembly. Of course, all pins require this protection, not just RS-485 inputs and outputs.Typical ApplicationsThe MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figures 24 and 25 show typical net-work applications circuits. These parts can also be used as line repeaters, with cable lengths longer than 4000 feet, as shown in Figure 21.To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. The slew-rate-limited MAX3483E/MAX3488E and the partially slew-rate-limited MAX3486E are more tolerant of imperfect termination.3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers14______________________________________________________________________________________Figure 22a. Human Body ESD Test ModelFigure 22b. Human Body Current WaveformFigure 23a. IEC 1000-4-2 ESD Test ModelFigure 23b. IEC 1000-4-2 ESD Generator Current WaveformMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers______________________________________________________________________________________15Figure 25. MAX3488E/MAX3490E/MAX3491E Full-Duplex RS-485 NetworkFigure 24. MAX3483E/MAX3485E/MAX3486E Typical RS-485 NetworkM A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceiversTRANSISTOR COUNT: 761Chip InformationOrdering Information (continued)Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.16____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©1999 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.。
MAX490ECUA-T中文资料
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at .
元器件交易网
MAX481E/MAX483E/MAX485E/MAX487E–MAX491E/MAX1487E
19-0410; Rev 4; 10/03
±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers
Ordering Information
PART MAX481ECPA MAX481ECSA MAX481EEPA MAX481EESA MAX483ECPA MAX483ECSA MAX483EEPA MAX483EESA
TEMP RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C
These transceivers draw as little as 120µA supply current when unloaded or when fully loaded with disabled drivers (see Selector Guide). Additionally, the MAX481E, MAX483E, and MAX487E have a low-current shutdown mode in which they consume only 0.5µA. All parts operate from a single +5V supply.
LA1806中文资料
元器件交易网
LA1806
Opearating Conditions at Ta =25°C
Parameter Recommended supply voltage Operating voltage range
2.4
3.9
5.4 %
2.7
%
9.5 14.5 mA
29
54
97 mV
78 126 193 mV
17
21
dB
50
55
dB
0.45 1.2 %
0.6 1.5 %
16
24
32 dBµ
Note : For further details, refer to the separate catalog of the LA1805.
. FM main distortion (0.8% → 0.45%) . AM detection output (approximately 5 dB increased)
The constants on five external parts are changed as LA1811
Package Dimensions
元器件交易网
Ordering number: EN3210A
Monolithic Linear IC
LA1806
AM/FM-IF/MPX Tuner System for Radio-Cassette Recorders, Music Centers
Overview
The LA1806 is a characteristics-improved version of the LA1811, with the same pin assignment and package as those of
MAX1589EZT180-T中文资料
1.8V, 2.5V, and 3.0V) o Tiny 6-Pin Thin SOT23 Package (<1.1mm High) o Thin 6-Pin TDFN Package (<0.8mm High)
6-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) ....727mW 6-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW
Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ..................................................... +150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER Input Voltage Input Undervoltage Lockout
Output Voltage Accuracy
Maximum Output Current Current Limit
MAX2321EUP+T中文资料
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
MAX2321EUP+
-40°C to +85°C
20 TSSOP-EP*
+Indicates lead-free package.
*EP = Exposed pad. Ordering Information continued at end of data sheet.
Pin Configurations
MAX2327
DESCRIPTION Dual-band, dual VCO inputs, and dual IF outputs MAX2320 with LO doubler
PCS band, single mode with optional frequency doubler
Cellular band, dual IF outputs MAX2320 with LO divider
E1UAA20-16.257M中文资料(ECLIPTEK)中文数据手册「EasyDatasheet - 矽搜」
E1U列•符合RoHS（无铅）•HC-49 / US短包•AT或BT切提供•电阻焊接密封•紧公差/稳定性•磁带和卷轴,绝缘片,和自定义引线长度可供选择NOTES H 2.50L 11.18W 4.70水晶_____________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________________________________________________________________________________电气特性频率范围频率公差/稳定性在工作温度范围温度范围工作温度范围老化（25°C）存储温度范围并联电容绝缘电阻驱动电平负载电容（C)3.579545MHz为50.000MHz为±50ppm /±100ppm（标准）,±30ppm/为±50ppm（AT切割只）,±15ppm/±30ppm（AT切割只）,±15ppm/±20ppm（AT切割只）,或±10ppm/±15ppm（AT切割专用）0°C到70°C,-20°C至70°C（AT切割只）,或-40°C至85°C（AT切割专用）±5ppm/年最大-40°C至125°C7pF最大500兆欧最低在100V1 mWatt最大18pF之（标准）,自定义C 10pF,或串联谐振等效串联电阻（ESR）,运作模式（MODE）,切频率范围3.579545MHz到4.999MHz5.000MHz到5.999MHz6.000MHz到7.999MHz8.000MHz到8.999MHz9.000MHz到9.999MHz10.000MHz到14.999MHz ESR (Ω)200最大150最大120最大90马克斯80马克斯70马克斯模式/剪切基本/ AT基本/ AT基本/ AT基本/ AT基本/ AT基本/ AT频率范围15.000MHz到15.999MHz16.000MHz到23.999MHz24.000MHz到30.000MHz24.000MHz到40.000MHz24.576MHz为29.999MHz30.000MHz到50.000MHzESR (Ω)60马克斯50马克斯40马克斯40马克斯150最大100最大模式/剪切基本/ AT基本/ AT基本/ AT基本/ BT三次泛音/ AT三次泛音/ AT.ECLIPTEK CORP.CRYSTAL E1U HC-49/US Short CR4111/07零件编码指南E1U A A 18 - 20.000M - I2 TR频率公差/稳定性A =±50PPM 25°C时,±0℃至100ppm70℃B =±50PPM,在25°C,±100ppm-20℃至70℃C =±50PPM,在25°C,±100ppm温度范围为-40°C至85°CD =±30ppm25°C时,±0℃50PPM至70℃E =±30ppm25°C时,为±50ppm -20℃至70℃F =±30ppm25°C时,为±50ppm -40°C至85°CG =±15ppm25°C时,±0℃为30ppm至70℃H =±15ppm25°C时,±30ppm-20℃至70℃J =±15ppm25°C时,±30ppm温度范围为-40°C至85°C K =±15ppm25°C时,±0℃为20ppm至70℃L =±15ppm25°C时,±20ppm-20℃至70℃M =±15ppm25°C时,±20ppm温度范围为-40°C至85°C N =±10ppm25°C时,±0℃为15ppm至70℃P =±10ppm25°C时,±15ppm-20℃至70℃包装选择空白=散装,A =盘,TR =卷带式可选项空白=无（标准）CX =自定义引线长度I2 =绝缘子标签频率负载电容S =系列X X = X X pF（自定义）动作模式/水晶切割A =基本/ A TB =三次泛音/ A TD =基本/ BT外形尺寸ALL DIM ENSIONS IN M ILLIM ET ERS 卷带尺寸ALL DIM ENSIONS IN M ILLIM ET ERS环境/机械特性PARAMET ER SPECIFICAT ION 标记规格1000 Pieces per ReelCompliant to EIA-468B精细泄漏测试总泄漏测试铅完整铅端接机械冲击耐焊接热抗溶剂可焊性温度循环振荡M IL-STD-883,方法1014,条件AM IL-STD-883,方法1014,条件CM IL-STD-883 2004方法锡2微米 - 6微米M IL-STD-202,方法213,条件CM IL-STD-202,方法210M IL-STD-202,方法215M IL-STD-883,2002年法M IL-STD-883,法1010M IL-STD-883,方法2007,条件A1号线：电子X X.X X X中号Frequency in MHz(5 Digits Maximum + Decimal).ECLIPTEK CORP.CRYSTAL E1U HC-49/US Short CR4111/07。
MAXIM MAX2130 数据手册
General DescriptionThe MAX2130 broadband, low-distortion, low-noise,two-output amplifier performs preamp, loop-out, and buffer functions in TV tuner applications. The device integrates functions typically achieved with discrete components into the space-saving 8-pin µMAX-EP package. The MAX2130 provides a gain of +15dB with a noise figure less than 3.2dB over the 44MHz to 878MHz frequency range. The MAX2130 features an externally adjustable bias control, set with a single resistor, that allows the user to meet minimum linearity requirements while reducing current consumption. The device operates from a +5V single supply and only requires 93mA of supply current when nominally biased.________________________ApplicationsDVB-T Digital Broadcast Receivers Digital/Terrestrial TV Tuners Set-Top Boxes Cable Modems Analog TV TunersFeatures♦+5V Single-Supply Operation♦44MHz to 878MHz Operating Frequency Range ♦Guaranteed 7.4dB (min) Input Return Loss Over Frequency Range ♦LNA Performance at I CC = 93mA (R BIAS = 15k Ω)15dB Gain2.8dB Noise Figure +17.5dBm Input IP3+27dBm Input IP2+2.7dBm Input 1dB Compression Point ♦Loop-Out Amplifier Performance at I CC = 93mA (R BIAS = 15k Ω)8.7dB Gain4.2dB Noise Figure +17dBm Input IP3+29dBm Input IP2-0.5dBm Input 1dB Compression Point ♦Programmable Linearity vs. Supply CurrentMAX2130________________________________________________________________Maxim Integrated Products 1Typical Application CircuitOrdering Information*Exposed paddlePin Configuration appears at end of data sheet.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .M A X 2130Broadband, Two-Output, Low-Noise Amplifier for TV Tuner Applications 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSDC ELECTRICAL CHARACTERISTICSAC ELECTRICAL CHARACTERISTICS(MAX2130 EV kit, V CC = +4.75V to +5.25V, R BIAS = 15k Ω±1%, f IN= 500MHz, Z O = 75Ω. Typical values are at V CC = +5V,T A = +25°C, unless otherwise noted.) (Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC to GND..............................................................-0.3V to +6V BIAS, OUT2 to GND.....................................-0.3 to (V CC + 0.3V)IN Input Power................................................................+15dBm OUT1 to GND...........................................................-0.3V to +6V OUT2 Short-Circuit Duration......................................Continuous Continuous Power Dissipation (T A = +70°C)8-Pin µMAX-EP (derate 15.4mW/°C above +70°C)........1.2WOperating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CESD SENSITIVE DEVICEMAX2130Broadband, Two-Output, Low-Noise Amplifier for TV Tuner Applications_______________________________________________________________________________________38891908992939495969798-4010-15356085SUPPLY CURRENT vs. TEMPERATUREM A X 2130 t o c 01TEMPERATURE (°C)S U P P L Y C U R R E N T (m A )506070809010011012013010.015.012.517.520.022.525.0SUPPLY CURRENT vs. R BIASM A X 2130 t o c 02R BIAS (k Ω)S U P P L Y C U R R E N T (m A )71098111213141516174002006008001000GAIN vs. FREQUENCYR BIAS = 10k ΩFREQUENCY (MHz)G A I N (d B )AC ELECTRICAL CHARACTERISTICS (continued)(MAX2130 EV kit, V CC = +4.75V to +5.25V, R BIAS = 15k Ω±1%, f IN= 500MHz, Z O = 75Ω. Typical values are at V CC = +5V,Note 2:Specifications are guaranteed over the operating frequency range.Note 3:Operation possible with V CC = +3.5V. See Typical Operating Characteristics .Note 4:Two tones at 500MHz and 506MHz, -20dBm per tone.Note 5:Two tones at 500MHz and 550MHz, -20dBm per tone.Note 6:Output load has worst-case 6dB return loss.Typical Operating Characteristics(MAX2130 EV kit, V CC = +5V, R BIAS = 15k Ω±1%, T A = +25°C, unless otherwise noted.)M A X 2130Broadband, Two-Output, Low-Noise Amplifier for TV Tuner Applications 4_______________________________________________________________________________________Typical Operating Characteristics (continued)(MAX2130 EV kit, V CC = +5V, R BIAS = 15k Ω±1%, T A = +25°C, unless otherwise noted.)710981112131415161704002006008001000GAIN vs. FREQUENCYR BIAS = 15k ΩFREQUENCY (MHz)G A I N (d B )710981112131415161704002006008001000GAIN vs. FREQUENCYR BIAS = 25k ΩFREQUENCY (MHz)G A I N (d B )0132454002006008001000LNA NOISE FIGURE vs. FREQUENCYFREQUENCY (MHz)N O I S E F I G U R E (d B )02143564002006008001000LOOP-OUT AMPLIFIER NOISE FIGURE vs. FREQUENCYFREQUENCY (MHz)N O I S E F I G U R E (d B )1.51.00.52.02.53.03.54.04.55.010.015.012.517.520.022.525.0NOISE FIGURE vs. R BIASR BIAS (k Ω)N O IS E F I G U R E (d B )-5-2-3-4-1012345-4010-15356085INPUT P1dB vs. TEMPERATURETEMPERATURE (°C)I N P U TP 1d B (d B m )-5-3-40-1-2321410.015.012.517.520.022.525.0INPUT P1dB vs. R BIASR BIAS (k Ω)IN P U T P 1d B (d B m )2528272629303132333435-4010-15356085INPUT IP2 vs. TEMPERATURETEMPERATURE (°C)I N PU T I P 2 (d B m )1525203530404510152025R BIAS (k Ω)I N P U T I P 2 (d B m )LNAINPUT IP2 vs. R BIASMAX2130Broadband, Two-Output, Low-Noise Amplifier for TV Tuner Applications_______________________________________________________________________________________515.015.516.016.517.017.518.018.519.0-40-1510356085INPUT IP3 vs. TEMPERATURETEMPERATURE (°C)I N P U T I P 3 (d B m )101216141820R BIAS (k Ω)I N P U T I P 3 (d B m )10201525LNAINPUT IP3 vs. R BIAS101216141820R BIAS (k Ω)I N P U T I P 3 (d B m )10201525LOOP-OUT AMPLIFIER INPUT IP3 vs. R BIAS-60-40-50-20-30-1004002006008001000ISOLATION vs. FREQUENCYFREQUENCY (MHz)I S O L A T I O N (d B )15525203530404002006008001000IN PORTRETURN LOSS vs. FREQUENCYFREQUENCY (MHz)R E T U R N L O S S (d B)102015105004002006008001000OUT1 PORTRETURN LOSS vs. FREQUENCYFREQUENCY (MHz)R E T U R N L O S S (d B )015105202530354045504002006008001000OUT2 PORTRETURN LOSS vs. FREQUENCYFREQUENCY (MHz)R E T U R N L O S S (d B )202535304045R BIAS (k Ω)I N P U T I P 2 (d B m )10201525LOOP-OUT AMPLIFIER INPUT IP2 vs. R BIASTypical Operating Characteristics (continued)(MAX2130 EV kit, V CC = +5V, R BIAS = 15k Ω±1%, T A = +25°C, unless otherwise noted.)M A X 2130Broadband, Two-Output, Low-Noise Amplifier for TV Tuner Applications 6_______________________________________________________________________________________Detailed DescriptionThe MAX2130 is a broadband, high-gain, low-distortion low-noise amplifier (LNA) with two outputs intended for operation over the 44MHz to 878MHz frequency range.The device operates from a +5V supply and features externally adjustable bias control circuitry that allows minimum linearity requirements to be met while reduc-ing current consumption.InputThe IN port is a broadband 75Ωinput that provides a guaranteed minimum input return loss of 7.4dB (allow-ing for 2:1 VSWR at output) across the 44MHz to 878MHz frequency range. AC-couple the IN port with a 0.1µF DC-blocking capacitor.OutputsThe OUT1 port is a broadband, 75Ω, open-collector output for the LNA. It requires a pullup inductor to V CC for proper biasing, as well as a 0.1µF DC-blocking capacitor. See the Applications Information section for proper inductor selection.The OUT2 port is a broadband, 75Ωoutput for the loop-out amplifier. The loop-out amplifier is internally biased and does not require a pullup inductor. AC-couple the OUT2 port with a 0.1µF DC-blocking capacitor.Bias CircuitryThe linearity and supply current for both amplifiers are externally programmable with a single resistor, R BIAS ,from BIAS to G ND. A nominal resistor value of 15k Ωsets an input IP3 of +17.5dBm, an input IP2 of +27dBm, and a supply current of 93mA. Decrease theresistor value to improve linearity at the cost of increased supply current. Increase the resistor value to decrease supply current and degrade linearity. Use resistor values greater than 10k Ω. G ain is not signifi-cantly affected by the R BIAS value.Applications InformationInductor SelectionThe OUT1 port of the LNA requires a pull-up inductor to V CC for proper biasing. The exact value of the inductor is not important as long as it has broadband imped-ance >150Ω(<500Ω) at 10MHz across the 44MHz to 878MHz frequency band. Table 1 is a list of recom-mended inductors.Table 1. OUT1 Pullup InductorDynamic Linearity AdjustmentThe LNA and loop-out amplifier linearity can be dynam-ically adjusted by varying the amount of current sourced by the BIAS port. The BIAS port is internally biased to 1.2V. A resistor, R BIAS , connected from BIAS to ground sets the bias current. An additional resistor,R ADJ , placed from the BIAS port to an external voltage source, such as a digital-to-analog converter (DAC),varies the current sourced by the BIAS port. Choosing R ADJ = R BIAS = 20k Ωand varying the voltage of the DAC from ground to 2.4V effectively varies the resis-tance seen from the BIAS port from 10k Ωto an open circuit. See Typical Application Circuit .The DAC output voltage, V ADJ , required to set an equiv-alent resistance to ground, R EQ , seen by the BIAS port,can be calculated with the following equation:V ADJ = 2.4V - (R BIAS ✕V BIAS ) / R EQwhere R ADJ = R BIAS , V BIAS = 1.2V, R EQ ≥10k Ω.Power-Supply BypassingProper voltage-supply bypassing is essential for high-frequency circuit stability. Bypass the V CC pin with a 1000pF capacitor in parallel with a 47pF capacitor,located as close to the V CC pin as possible. Refer to the MAX2130 EV kit for additional information.MAX2130Broadband, Two-Output, Low-Noise Amplifier for TV Tuner Applications_______________________________________________________________________________________7Pin ConfigurationChip InformationTRANSISTOR COUNT: 167M A X 2130Broadband, Two-Output, Low-Noise Amplifier for TV Tuner Applications Maxi m cannot assume responsi bi li ty for use of any ci rcui try other than ci rcui try enti rely embodi ed i n a Maxi m product. No ci rcui t patent li censes are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2003 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.8L , μM A X , E X P P A D .E P SPackage Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to /packages .)。
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General DescriptionThe MAX1806 low-dropout linear regulator operates from a +2.25V to +5.5V supply and delivers a guaran-teed 500mA load current with low 175mV dropout. The high-accuracy (±1%) output voltage is preset at an internally trimmed voltage (see Selector Guide ) or can be adjusted from +0.8V to +4.5V with an external resis-tive-divider.An internal PMOS pass transistor allows low 210µA supply current, making this device ideal for portable equipment such as personal digital assistants (PDAs),cellular phones, cordless phones, and other equip-ment, including base stations and docking stations.Other features include an active-low, power-OK output that indicates when the output is out of regulation, a 0.02µA shutdown mode, short-circuit protection, and thermal shutdown protection. The MAX1806 comes in a miniature 1.3W, 8-pin power-µMAX package with a metal pad on the underside of the package.ApplicationsNotebook ComputersCellular and Cordless Telephones PDAsPalmtop Computers Base Stations USB Hubs Docking StationsFeatureso Guaranteed 500mA Output Current o Output Down to 0.8Vo Low 175mV Dropout at 500mAo ±1% Output Voltage AccuracyPreset at 0.8V, 1.5V, 1.8V, 2.5V, or 3.3V Adjustable from 0.8V to 4.5V o Power-OK Outputo Low 210µA Ground Current o 0.02µA Shutdown Current o Thermal Overload Protection o Output Current Limito Tiny 1.3W, 8-Pin Power-µMAX PackageMAX1806500mA, Low-Voltage Linear Regulator in µMAX________________________________________________________________Maxim Integrated Products 1Pin ConfigurationOrdering InformationTypical Operating Circuit19-2018; Rev 0; 4/01For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .M A X 1806500mA, Low-Voltage Linear Regulator in µMAX 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V IN = V OUT(SETPOINT)+ 500mV or V IN = +2.25V whichever is greater, SET = GND, SHDN = IN, T A = 0°C to +85°C , unless otherwise noted. Typical values are at T= +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.IN, SHDN , POK, SET to GND...................................-0.3V to +6V OUT to GND ................................................-0.3V to (V IN + 0.3V)Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (T A = +70°C)8-Pin Power-µMAX (derate 17mW/°C above +70°C).......1.3WOperating Temperature.......................................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX1806500mA, Low-Voltage Linear Regulator in µMAX_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V IN = V OUT(SETPOINT)+ 500mV or V IN = +2.25V whichever is greater, SET = GND, SHDN = IN, T A = 0°C to +85°C , unless otherwiseELECTRICAL CHARACTERISTICS(V IN = V OUT(SETPOINT)+ 500mV or V IN = +2.25V whichever is greater, SET = GND, SHDN = IN, T A = -40°C to +85°C , unless other-wise noted. Typical values are at T A = +25°C.) (Note 2)M A X 1806500mA, Low-Voltage Linear Regulator in µMAX 4_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS (continued)(V IN = V OUT(SETPOINT)+ 500mV or V IN = +2.25V whichever is greater, SET = GND, SHDN = IN, T A = -40°C to +85°C , unless other-wise noted. Typical values are at T A = +25°C.) (Note 2)For 2.25V ≤V OUT ≤4.0V, dropout voltage limits are linearly interpolated from the values listed. For V OUT < 4.0V, dropout voltage limit is equal to the value for V OUT = 4.0V.Note 2:Specifications to -40°C are guaranteed by design, not production tested.Typical Operating Characteristics(MAX1806EUA33, V IN = V OUT + 500mV, SHDN = IN, C IN = 1µF, C OUT = 10µF, T A = +25°C, unless otherwise noted.)1.00.52.01.53.02.53.51.52.53.02.0 3.54.0 4.55.0 5.5OUTPUT VOLTAGE vs. INPUT VOLTAGEINPUT VOLTAGE (V)O U T P U T V O L T A G E (V )6.03.253.263.283.273.303.313.293.320200300100400500600700800OUTPUT VOLTAGE vs. LOAD CURRENTM A X 1806 t o c 02LOAD CURRENT (mA)O U T P U T V O L T A G E (V)3.283.303.293.323.313.333.34-4010-15356085OUTPUT VOLTAGE vs. TEMPERATURETEMPERATURE (°C)O U T P U T V O L T A G E (V )010050200150250300350400200300100400500600700800DROPOUT VOLTAGE vs. LOAD CURRENTLOAD CURRENT (mA)D R O P O U T V O L T A GE (m V )0.140.160.180.200.220.240.260.282.02.53.03.54.04.5DROPOUT VOLTAGE vs.OUTPUT VOLTAGEM A X 1806 t o c 05OUTPUT VOLTAGE (V)D R O P O U T V O L T A GE (V )0100501502002503003504004505005506002.03.04.05.06.0GROUND-PIN CURRENT vs.INPUT VOLTAGEINPUT VOLTAGE (V)G R O U N D -P I N C U R R E N T (µA )3.52.54.55.5MAX1806500mA, Low-Voltage Linear Regulator in µMAX_______________________________________________________________________________________5Typical Operating Characteristics (continued)(MAX1806EUA33, V IN = V OUT + 500mV, SHDN = IN, C IN = 1µF, C OUT = 10µF, T A = +25°C, unless otherwise noted.)100200150300250350400450500200300100400500600700800GROUND-PIN CURRENT vs.LOAD CURRENTLOAD CURRENT (A)G R O U N D -P I N C U R R E N T (µA )150160180170190200-4010-15356085GROUND-PIN CURRENT vs.TEMPERATURETEMPERATURE (°C)G R O U N D -P I N C U R R E N T (µA )-600.010.11101001000-50-40-30-20-100POWER-SUPPLY REJECTION RATIOvs. FREQUENCYFREQUENCY (kHz)P S R R (d B )100.0010.111001000OUTPUT SPECTRAL NOISE DENSITYvs. FREQUENCY0.010.11FREQUENCY (kHz)O U T P U T S P E C T R A L N O I S E D E N S I T Y (µV /√H z )10OUTPUT NOISE DC TO 1MHzMAX1806 toc1120ms/divV OUT 1mV/divV OUT = 3.3VR OUT = 66Ω (50mA)0.01200100400600800700REGION OF STABLE C OUT ESRvs. LOAD CURRENT0.1110100FREQUENCY (kHz)R E G I O N O F C O U T E S R300500LOAD-TRANSIENT RESPONSE10µs/divI OUT200mA/divV OUT 20mV/divV IN = V OUT + 500mV C IN = 10µFR OUT = 660Ω TO 6.6Ω (5mA TO 500mA)M A X 1806500mA, Low-Voltage Linear Regulator in µMAX 6_______________________________________________________________________________________Regulator Input. Supply voltage can range from +2.25V to +5.5V. Bypass with a 1Capacitor Selection and Regulation Stability Open-Drain, Active-Low Power-OK Output. POK remains low while the output voltage (V POK threshold. Connect a 100k Ω pullup resistor from POK to OUT.Active-Low Shutdown Input. A logic low at output is low. Connect SHDN to IN for normal operation.Ground. This pin and the exposed pad also function as a heatsink. Solder both to a large pad or to the circuit-board ground plane to maximize power dissipation.Voltage-Setting Input. Connect SET to GND for preset output. Connect an external resistive voltage-divider from OUT to SET to set the output voltage between 0.8V and 4.5V. The SET regulation voltage is 800mV.LINE-TRANSIENT RESPONSEMAX1806 toc15200µs/divV IN 1V/div 6V 3VV OUT 10mV/divSHUTDOWN WAVEFORM20µs/div2V 3V 00V OUT 1V/div R OUT = 6.6Ω (500mA)V 1V/div Typical Operating Characteristics (continued)(MAX1806EUA33, V IN = V OUT + 500mV, SHDN = IN, C IN = 1µF, C OUT = 10µF, T A = +25°C, unless otherwise noted.)LOAD-TRANSIENT RESPONSENEAR DROPOUT10µs/divI OUT200mA/divV OUT 50mV/divV IN = V OUT + 100mV C IN = 10µFR OUT = 660Ω TO6.6Ω (5mA TO 500mA)POK WAVEFORM200µs/divV IN 2V/div V OUT 2V/div 5V 000V POK 2V/div R OUT = 66Ω (50mA)MAX1806500mA, Low-Voltage Linear Regulator in µMAX_______________________________________________________________________________________7Detailed DescriptionThe MAX1806 is a low-dropout, low-quiescent-current linear regulator. The device supplies loads up to 500mA and is available with preset output voltages. As illustrated in Figure 1, the MAX1806 includes a 0.8V ref-erence, error amplifier, P-channel pass transistor, and internal feedback voltage-divider.The reference is connected to the error amplifier, which compares it with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled lower, which allows more current to pass to the output increasing the output voltage. If the feedback voltage is too high, the pass-transistor gate is pulled up, allowing less current to pass to the output.The output voltage is fed back through either an inter-nal resistive voltage-divider connected to OUT or an external resistor network connected to SET. The dual-mode comparator examines V SET and selects the feed-back path. If V SET is below 35mV, the internal feedback path is used, and the output is regulated to the factory-preset voltage. Additional blocks include an output cur-rent limiter, thermal sensor, and shutdown logic.Internal P-Channel Pass TransistorThe MAX1806 features a 0.4ΩP-channel MOSFET pass transistor. Unlike similar designs using PNP pass tran-sistors, P-channel MOSFETs require no base drive,which reduces operating current. PNP-based regula-tors also waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents under large loads. The MAX1806 does not suf-fer from these problems.Output Voltage SelectionThe MAX1806’s dual-mode operation allows operation in either a preset voltage mode or an adjustable mode.Connect SET to GND to select the preset output volt-age. The two-digit part number suffix identifies the out-put voltage (see Selector Guide ). For example, the MAX1806EUA33 has a preset 3.3V output voltage. The output voltage may also be adjusted by connecting a voltage-divider from OUT to SET (Figure 2). Select R2 in the 25k Ωto 100k Ωrange. Calculate R1 with the follow-ing equation:R1 = R2 [(V OUT / V SET ) - 1]where V SET = 0.8V, and V OUT may range from 0.8V to 4.5V.ShutdownDrive SHDN low to enter shutdown. During shutdown,the output is disconnected from the input, and supplycurrent drops to 0.02µA. When in shutdown, POK pulls low. The capacitance and load at OUT determine the rate at which V OUT decays. SHDN can be pulled as high as +6V, regardless of the input and output voltage.Power-OK OutputThe POK output pulls low when OUT is less than 93% of the nominal regulation voltage. Once OUT exceeds 93% of the nominal voltage, POK goes high imped-ance. POK is an open-drain N-channel output. To obtain a logic voltage output, connect a pullup resistor from POK to OUT. A 100k Ωresistor works well for most applications. POK can be used to signal a microcon-troller (µC), or drive an external LED to indicate power failure. When the MAX1806 is shutdown, POK is held low independent of the output voltage. If unused, leave POK grounded or unconnected.Current LimitThe MAX1806 monitors and controls the pass transis-tor ’s gate voltage, limiting the output current to 1.4A (typ). The output can be shorted to ground for an indefi-nite period of time without damaging the part.Thermal Overload ProtectionThermal overload protection limits total power dissipa-tion in the MAX1806. When the junction temperature exceeds T J = +170°C, a thermal sensor turns off the pass transistor, allowing the device to cool. The thermal sensor turns the pass transistor on again after the junc-tion temperature cools by 20°C, resulting in a pulsed output during continuous thermal overload conditions.Thermal overload protection protects the MAX1806 in the event of fault conditions. For continuous operation,do not exceed the absolute maximum junction-temper-ature rating of T J = +150°C.Operating Region and Power DissipationThe MAX1806’s maximum power dissipation depends on the thermal resistance of the IC package and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The power dissipated in the device is P = I OUT ✕(V IN -V OUT ). The maximum allowed power dissipation is 1.3W or:PMAX = (T J(MAX)- T A ) / (θJC + θCA )where T J - T A is the temperature difference between the MAX1806 die junction and the surrounding air, θJC is the thermal resistance from the junction to the case,and θCA is the thermal resistance from the case through the PC board, copper traces, and other materi-als to the surrounding air. The MAX1806 package fea-tures an exposed thermal pad on its underside. This pad lowers the package ’s thermal resistance by provid-M A X 1806500mA, Low-Voltage Linear Regulator in µMAX 8_______________________________________________________________________________________ing a direct heat conduction path from the die to the PC board. Connect the exposed backside pad and GND to the system ground using a large pad or ground plane,or multiple vias to the ground plane layer.The MAX1806 delivers up to 0.5A(RMS) and operates with input voltages up to 5.5V, but not simultaneously.High output currents can only be sustained when input-output differential is within the limits outlined.Applications InformationCapacitor Selection and RegulatorStabilityConnect a 1µF capacitor between IN and ground and a 10µF low equivalent series resistance (ESR) capacitor between OUT and ground. The input capacitor (C IN )lowers the source impedance of the input supply.Reduce noise and improve load-transient response,stability, and power-supply rejection by using largeroutput capacitors. The output capacitor ’s (C OUT ) ESR affects stability and output noise. Use output capacitors with an ESR of 0.1Ωor less to ensure stability and opti-mum transient response. Surface-mount ceramic capacitors have very low ESR and are commonly avail-able in values up to 10µF. Connect C IN and C OUT as close to the MAX1806 as possible.Noise, PSRR, and Transient ResponseThe MAX1806 is designed to operate with low dropout voltages and low quiescent currents, while still main-taining good noise, transient response, and AC rejec-tion. See the Typical Operating Characteristics for a plot of Power-Supply Rejection Ratio (PSRR) vs. Freq-uency. When operating from noisy sources, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive-filtering techniques. The MAX1806 load-transientFigure 1. Functional DiagramMAX1806500mA, Low-Voltage Linear Regulator in µMAX_______________________________________________________________________________________9response graphs (see Typical Operating Characteris-tics ) show two components of the output response: a DC shift from the output impedance due to the load current change, and the transient response. A typical transient overshoot for a step change in the load cur-rent from 5mA to 500mA is 40mV. Increasing the output capacitor ’s value and decreasing the ESR attenuates the overshoot.Input-Output (Dropout) VoltageA regulator ’s minimum input-to-output voltage differen-tial (dropout voltage) determines the lowest usable sup-ply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage.Because the MAX1806 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source on-resistance (R DS(ON)) multiplied by the load current (see Typical Operating Characteristics ):V DROPOUT = V IN - V OUT = R DS(ON)✕I OUTChip InformationTRANSISTOR COUNT: 949Figure 2. Adjustable Output Using External Feedback ResistorsFigure 3. Power Operating Regions: Maximum Output Current vs. Supply VoltageM A X 1806500mA, Low-Voltage Linear Regulator in µMAX Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.10____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2001 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.Package Information。