ME4056SPG

ME4056 1A Lithium Ion Battery Linear Charger ME4056 General Description Features ME4056 is a complete constant-current/constant voltage ●Protection of battery cell reverse connection linear charger for single cell lithium-ion batteries. With a ● Programmable charge current up to 1A thermally // enhanced 8-PIN SOP package on the bottom ●No MOSFET sense resistor or blocking diode and low external component count make the ME4056 ideally suited for portable applications. Furthermore the required ●Complete linear Charger in SOP8 Package for ME4056 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 single Cell Lithium-Ion Batteries. ●Constant-Current/Constant-Voltage with thermal regulation to maximize Rate PMOSFET Typical charge battery） Without risk of cycle（1000mAh overheating. architecture .Thermal feedback regulates the charge current to limit the die temperature during high power operation ● Preset 4.2V (ME4056A is 4.34V) charge voltage with ±1% accuracy operation or high ambient temperature .The charge voltage is fixed at 4.2V (ME4056A is 4.34V),and the charge current ● Automatic Recharge can be programmed externally with a single resistor. The ● Two Status Indication for Charge status, no ME4056 automatically terminates the charge cycle when th battery and battery failure indicators the charge current drops to 1/10 the programmed value ● C/10 charge termination after the final float voltage is reached. ● 55μA supply current in shutdown When the input supply (wall adapter or USB supply) is removed the ME4056 automatically enters a low current state dropping the battery drain current to less than 2μA.The ME4056 can be put into shutdown mode reducing the supply current to 55μA. ● 2.9V trickle current charge threshold ● Soft-Start limits inrush current ● Battery Temperature Sensing ● Available in SOP8-PP package Typical charge cycle（1000mAh battery） Other features include Battery temperature monitor, under-voltage lockout, automatic recharge and two status pins to indicate charge and charge termination. Applications ●Cellular Telephones ●Digital Still Cameras ●MP3 Players ●Bluetooth Applications ●Portable Devices ●USB Bus-Powered Chargers V05 www.microne.com.cn Page 1 of 19 ME4056 Pin Configuration Pin Assignment Pin Num. Symbol Function 1 VCC Positive input supply voltage Provides power to the internal circuit. When VCC drops to within 80mV of the BAT pin voltage, the ME4056 enters low power sleep mode, dropping IBAT to less than 2μA. 2 GND Ground 3 PROG 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: 4 5 TEMP Temperature sense input Connecting TEMP pin to NTC thermistor’s output in Lithium ion battery pack. If TEMP pin’s voltage is below 45% or above 80% of supply voltage VCC, this means that battery’s temperature is too low or too high, charging is suspended. The temperature sense function can be disabled by grounding the TEMP pin. CE Chip enable input A high input will put the device in the normal operating mode. Pulling the CE pin to low level will put the ME4056 into disable mode. The CE pin can be driven by TTL or CMOS logic level. 6 7 8 V05 BAT 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. Charge terminated status output is pulled low by an internal switch to indicate a battery charge terminated; this means Charge termination. Otherwise pin is in high impedance state. 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 or 4.3V www.microne.com.cn Page 2 of 19 ME4056 Block Diagram V05 www.microne.com.cn Page 3 of 19 ME4056 Absolute Maximum Ratings Parameter Rating Unit Input supply voltage : VCC -0.3～8 V PROG pin voltage -0.3～VCC+0.3 V BAT pin voltage -0.3～7 V TEMP pin voltage -0.3～10 V pin voltage -0.3～10 V pin voltage -0.3～10 V CE pin voltage -0.3～10 V BAT pin current 1200 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. V05 www.microne.com.cn Page 4 of 19 ME4056 Electrical Characteristics (ME4056) Symbol VCC ICC -IBAT VFLOAL IBAT Parameter Condition Min Typ. Max Unit 4.0 5.0 8.0 V ●Charge mode, RPROG=1.3KΩ - 150 500 μA ●Standby mode(charge end) - 55 100 μA ●Shutdown mode（RPROG not connected, VCC