ME4055A 1A锂电池充电管理

3
BAT
4
VCC
5
STDBY
6
PROG
IBAT =
VPROG *1100 RPROG
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ME4055A
Block Diagram
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ME4055A
Absolute Maximum Ratings
Parameter Input supply voltage : VCC PROG pin voltage BAT pin voltage pin voltage pin voltage BAT pin current PROG pin current Maximum junction temperature Operating ambient temperature :Topa Storage temperature :Tstr Soldering temperature and time Rating -0.3～8 -0.3～VCC+0.3 -0.3～7 -0.3～10 -0.3～10 800 1200 145 -40～85 -65～125 +260（Recommended 10S） Unit V V V V V mA μA ℃ ℃ ℃ ℃
Pin Configuration
CHRG 1 GND 2
6 PROG 5 STDBY 4 VCC
BAT 3
封装形式：SOT23-5
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ME4055A
Pin Assignment
ME4055AM6G Pin Num. 1 2 Symbol Open-Drain charge status output CHRG GND pin is pulled low by an internal switch, When the battery is being charged, the otherwise, pin is in high impedance state. Ground Battery connection Pin Connect the positive terminal of the battery to this pin. Dropping BAT pin’s current to less than 2μA when IC in disable mode or in sleep mode. BAT pin provides charge current to the battery and provides regulation voltage of 4.2V. Positive input supply voltage Provides power to the internal circuit. When VCC drops to within 80mV of the BAT pin voltage, the ME4055 enters low power sleep mode, dropping IBAT to less than 2μA. Charge terminated status output STDBY is pulled low by an internal switch to indicate a battery charge terminated; this means Charge termination. Otherwise STDBY pin is in high impedance state. Constant Charge Current Setting and Charge Current Monitor Pin The charge current is programmed by connecting a resistor RPROG from this pin to GND. When in precharge mode, the PROG pin’s voltage is regulated to 0.1V. When charging in constant-current mode this pin’s voltage is regulated to 1V. In all modes during charging, the voltage on this pin can be used to measure the charge current using the following formula: Function
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions.
BATTERY VOLTAGE(V)
ME4055
GND 1μF PROG 5 600mA 4.2V 1.65K Li-Ion BATTERY
200 1பைடு நூலகம்0 0 0
2
θ
JA=130℃/W
RPROG=1.65K CHARGE TA=25℃ TERMINATED 0.25 0.5 0.75 1.0 1.25 1.5 1.75 TIME(HOURS)
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ME4055A
Electrical Characteristics
Symbol VCC Parameter Input supply voltage ● ●Charge mode, RPROG=1.1KΩ ●Standby mode(charge end) ICC -IBAT static current ●Shutdown mode（RPROG not connected, VCC<VBAT, or VCC<VUV） 0℃≤TA≤85℃ ●RPROG=2.2KΩ, current mode BAT pin current (The condition of current mode is VBAT=3.9V) ●RPROG=1.1KΩ,current mode ●Standby mode: VBAT=4.2V Shutdown mode, RPROG not connected Sleep mode, VCC=0V ●VBAT<VTRIKL, RPROG=1.1KΩ RPROG=1.1KΩ, VBAT rising RPROG=1.1KΩ ● VCC from low to high ● VCC from low to high VCC from high to low ●RPROG=2.2KΩ ●RPROG=1.1KΩ ●RPROG=1.1KΩ, current mode =5mA VFLOAT -VRECHRG Condition Min 4.0 4.158 450 950 0 120 2.8 150 3.5 150 100 50 60 120 0.9 120 IBAT=0 to IBAT=1100V/RPROG VBAT from high to low IBAT below ICHG/10 0.8 0.8 Typ. 5.0 150 55 55 4.2 500 1000 -2.5 ± 1 -1 130 2.9 200 3.7 200 140 80 70 130 1.0 0.3 180 110 650 20 1.8 1.8 2.0 Max 8.0 500 100 100 4.242 550 1050 -6 ± 2 -2 140 3.0 250 3.9 300 180 110 80 140 1.1 0.6 240 4 4 Unit V μA μA μA V mA mA μA μA μA mA V mV V mV mV mA V V mV ℃ mΩ μS mS mS μA
ME4055A
800mA Lithium Ion Battery Linear Charger ME4055A
General Description
ME4055A is a complete constant-current/constant voltage linear charger for single cell lithium-ion batteries. Furthermore the ME4055A is specifically designed to work within USB power specifications. No external sense resistor is needed and no blocking diode is required due to the internal PMOSFET architecture .Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient
terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed the ME4055A automatically enters a low current state dropping the battery drain current to less than 2μA.The ME4055A can be put into shutdown mode reducing the supply current to 55μA. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status.
Features
●Protection of battery cell reverse connection ●No MOSFET sense resistor or blocking diode required ●Complete Linear Charger in ThinSOT Package for Single Cell Lithium-Ion Batteries ●Constant-Current/Constant-Voltage operation with thermal regulation to maximize Rate Without risk of overheating. ● Preset 4.2V charge voltage with ± 1% accuracy ● Automatic Recharge ●Charges Single Cell Li-Ion Batteries Directly from USB Port ●C/10 charge termination ● 55μA supply current in shutdown ● 2.9V trickle current charge threshold ● Soft-Start limits inrush current ●Charge Status Output Pin ●Available in SOT23-6 Package
temperature .The charge voltage is fixed at 4.2V,and the charge current can be programmed externally with a single resistor. The ME4055A automatically
600mA Single Cell Li-Ion Charger
VIN 4.5V TO 6.5V
Typical charge cycle（750mAh batter）
700
CHARGE CURRENT(mA)
4
VCC BAT 3
600 500 400 300
4.75 CONSTANT CURRENT CONSTANT 4.5 CONSTANT VOLTAGAE POWER 4.25 4.0 VCC=5V 3.75 3.5 3.25 3.0 2.0
Applications
●Cellular Telephones, PDAs, MP3 Players ●Charging Docks and Cradles ●Bluetooth Applications
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ME4055A
Selection Guide
Typical
Application