ME4055AM6G

ME4055A 800mA Lithium Ion Battery Linear Charger ME4055A General Description Features 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 ●Protection of battery cell reverse connection ●No MOSFET sense resistor or blocking diode required ●Complete Linear Charger in Thin SOT Package for Single Cell Lithium-Ion Batteries blocking diode is required due to the internal ●Constant- Current/Constant- Voltage operation with PMOSFET architecture .Thermal feedback regulates thermal regulation to maximize Rate Without risk the charge current to limit the die temperature during of overheating. high power operation or high ambient ● Preset 4.2V charge voltage with ±1% accuracy temperature .The charge voltage is fixed at 4.2V,and ● Automatic Recharge the charge current can be programmed externally with ●Charges Single Cell Li-Ion Batteries Directly from a single resistor. The ME4055A automatically USB Port terminates the charge cycle when the charge current ●C/10 charge termination drops to 1/10th the programmed value after the final ● 55μA supply current in shutdown float voltage is reached. ● 2.9V trickle current charge threshold When the input supply (wall adapter or USB supply) ● Soft-Start limits inrush current is removed the ME4055A automatically enters a low ●Charge Status Output Pin current state dropping the battery drain current to less ●Available in SOT23-6 Package than 2μA.The ME4055A can be put into shutdown mode reducing the supply current to 55μA. Other features include charge current monitor, Applications undervoltage lockout, automatic recharge and a ●Cellular Telephones, PDAs, MP3 Players status. ●Charging Docks and Cradles ●Bluetooth Applications V06 www.microne.com.cn Page 1 of 17 ME4055A Selection Guide Typical charge cycle（750mAh batter 600mA Single Cell Li-Ion Charger VIN 4.5V TO 6.5V BAT ME4055A GND 1μF 600mA PROG 4.2V Li-Ion 1.65K BATTERY 4.75 CONSTANT CURRENT 600 CONSTANT 500 POWER CONSTANT 4.5 VOLTAGAE 4.25 400 4.0 300 VCC=5V 3.75 200 θ 3.5 100 RPROG=1.65K CHARGE TA=25℃ TERMINATED 0 0 JA=130℃/W 3.25 0.25 0.5 0.75 1.0 1.25 1.5 1.75 3.0 2.0 TIME(HOURS) Pin Configuration CHRG 1 6 PROG GND 2 5 STDBY BAT 3 4 VCC Package type：SOT23-6 V06 www.microne.com.cn Page 2 of 17 BATTERY VOLTAGE(V) VCC CHARGE CURRENT(mA) 700 ME4055A Pin Assignment ME4055AM6G Pin Num. Symbol Function 1 CHRG Open-Drain charge status output When the battery is being charged, the pin is pulled low by an internal switch, otherwise, pin is in high impedance state. 2 GND Ground BAT 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. VCC Positive input supply voltage Provides power to the internal circuit. When VCC drops to within 80mV of the BAT pin voltage, the ME4055A enters low power sleep mode, dropping IBAT to less than 2μA. 3 4 5 6 STDBY PROG 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: V06 IBAT = www.microne.com.cn VPROG *1100 RPROG Page 3 of 17 ME4055A Block Diagram V06 www.microne.com.cn Page 4 of 17 ME4055A Absolute Maximum Ratings Parameter Rating Unit Input supply voltage : VCC -0.3～6.5 V PROG pin voltage -0.3～VCC+0.3 V BAT pin voltage -0.3～6.5 V pin voltage -0.3～6.5 V pin voltage -0.3～6.5 V BAT pin current 800 mA PROG pin current 1200 μA Maximum junction temperature 145 ℃ Operating ambient temperature :Topa -40～85 ℃ Storage temperature :Tstr -65～125 ℃ Soldering temperature and time +260（Recommended 10S） ℃ 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. V06 www.microne.com.cn Page 5 of 17 ME4055A Electrical Characteristics Symbol Parameter Condition ICC -IBAT VFLOAT static current Max Unit 4.0 5.0 6.5 V ●Charge mode, RPROG=1.1KΩ - 150 500 μA ●Standby mode(charge end) - 55 100 μA ●Shutdown mode （ RPROG not connected, VCC