HX1102 900mA降压芯片

Digital cameras and MP3
Palmtop computers / PDAs
The HX1102 converters are available in the
Cellular phones Wireless handsets and DSL modems PC cards
industry standard SOT-23-5 power packages (or upon request).
and synchronous power MOSFET switches.
பைடு நூலகம்
VIN (Pin 4): Main Supply Pin. It must be closely decoupled to GND, Pin 2, with a 10µF or greater
ceramic capacitor.
ISW = -100mA When connected to ext. components VIN=EN=3.6 V, IOUT=100mA VIN=2.5V~5.5V
0.39 93 0.03 0.3
VLOADREG VOUT Load Regulation
0.33
EFFI = [(Output Voltage × Output Current) / (Input Voltage × Input Current)] × 100%
V V nA %/V MHz
µA µA
A
Ω Ω
%
%/V %
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4
Typical Performance Characteristics
HX1102
Output Noise 100mV/DIV AC COUPLED
VIN=3.6V VOUT=1.8V ILOAD=0mA
Output Noise 10mV/DIV AC COUPLED
VIN = 3V, VFB = 0.5V or VOUT = 90%, Duty Cycle < 35%
0.95 1.1
RPFET RDS(ON) of P-Channel FET
ISW = 100mA
0.3
RNFET
＊
EFFI
RDS(ON) of N-Channel FET Efficiency
∆VOUT VOUT Line Regulation
℃ ～ ℃ ISW ………………………………………………………………………………………………………..1.3A
Operating Temperature Range ……………………………………………………...- 40
+ 85
℃ Lead Temperature (Soldering 10 sec.) ………………………………………………………..+ 300
VIN=3.6V VOUT=1.8V ILOAD=200mA
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2ms/DIV
200ns/DIV
5
Application Information
PIN ASSIGNMENT
HX1102
EN (Pin 1): En Control Input. Forcing this pin above 1.5V enables the part. Forcing this pin below 0.3V
VFB (Pin 5) (HX1102): Feedback Pin. Receive the feedback voltage from an external resistive divider
across the output. In the adjustable version, the output voltage is set by a resistive divider according to the following formula: VOUT = 0.6V • [1 + (R1/R2)].
1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept short, direct and wide.
closely as possible? This capacitor provides the AC current to the internal power MOSFETs.
PCB LAYOUT GUIDELINES
When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the HX1102. These items are also illustrated graphically in Figure 1. Check the following in your layout:
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1
Typical Applications
ADJUSTABLE OUTPUT VOLTAGE
HX1102
Model HX1102
Pin Assignment
VOUT (V)
Adjustable Output Voltage
（ ） VOUT = 0.6V • [1 + (R1/R2)]
1.75 1.80 1.85
V
VIN
Input Voltage Range
VFB
Regulated Voltage
℃ TA = 25
2.5
5.5
0.5880 0.6 0.6120
IFB
∆VFB
Feedback Current VREF
VIN=2.5V~5.5V
±30 0.03 0.4
FOSC Oscillator Frequency
can shuts down the device. In shutdown, all functions are disabled drawing <1µA supply current. Do not leave EN floating.
GND (Pin 2): Ground Pin.
SW (Pin 3): Switch Node Connection to Inductor. This pin connects to the drains of the internal main
Mark F3F9
5
4
1
2
3
SOT-23-5
PIN NUMBER SOT-23- 5
1 2
PIN NAME
VIN GND
3
EN
4
VFB
5
SW
FUNCTION
Input Ground ON/OFF Control (High Enable)
Feedback Pin
Switch Output
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3. Does the (+) plate of CIN connects to VIN as
and load transient response
3 under an input voltage range from 2.5V to 5.5V.
Low quiescent current: 160µA
5 尚 This feature makes the HX1102 suitable for
Low Switch on Resistance RDS(ON), Internal0 亿 single Li-Lon battery-powered applications. 100%
Switch: 0.35Ω
： ～ Output voltage 5.5V 0.6V
9 微 duty cycle capability extends battery life in 6 电 portable devices, while the quiescent current is
2. Does the VFB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be connected between the (+) plate of COUT and ground.
Short-Circuit protection
2华
Shutdown quiescent current: < 1µA
8 The internal synchronous switch is desired to
Low profile SOT-23-5 package (lead-free 6 increase efficiency without an external Schottky
packaging is now available)
diode. The 1.2 MHz fixed switching frequency
allows the using of tiny, low profile inductors and
Application
ceramic capacitors, which minimized overall solution footprint.
VFB = 0.6V or VOUT = 100%
0.8
1
1.25
IQ
Quiescent Current
VFB = 0.5V or VOUT = 90%, ILOAD = 0A
160
IS
Shutdown Current
VEN = 0V, VIN = 4.2V
0.1
1
IPK
Peak Inductor Current
2
HX1102
Absolute Maximum Ratings
Power Dissipation………………………………………………………………………Internally limited
～ VIN …………………………………………………………………………………………..- 0.3 V + 6 V ～ VON/OFF ……………………………………………..……………………...……- 0.3 V (VIN + 0.3) V ～ VSW …………………………………………………………………………………- 0.3 V (VIN + 0.3) V ～ VFB……………………………………………………………………………………….....- 0.3 V + 6 V
Automatic PWM/PFM mode switching 8 子 160µA with no load, and drops to < 1µA in
No Schottky diode required 1.2MHz fixed frequency switching
5 李 shutdown.
℃ ～ ℃ Storage Temperature Range ……………………………………………………….- 65
+ 150
℃ Junction Temperature ……………………………………………………………………………+ 125
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3
Electrical Characteristics
℃ Operating Conditions: TA=25 , VIN=3.6V unless otherwise specified.
HX1102
SYMBOL
PARAMETER
VOUT
Output Voltage
CONDITIONS I OUT = 100mA, R1/R2=2
MIN TYP MAX UNITS
HXH1X1110022
900mA Synchronous Buck DC/DC Converter
Features
Description
Up to 95% Efficiency
The HX1102 is high efficiency synchronous,
Current mode operation for excellent line 1 PWM step-down DC/DC converters working
Portable media players
Order Information
①② HX1102 –
:
Symbol
① ②
Description Denotes Output voltage: A : Adjustable Output Denotes Package Types: E: SOT-23-5