WS4508E-5/TR

WS4508E WS4508E 600mA, Single Li-ion Battery Charger Http//:www.sh-willsemi.com Descriptions The WS4508E is a complete constant-current / constant voltage linear charger for single cell Lithium-Ion batteries. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die SOT-23-5L temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed CHGb 1 externally with a single resistor. 5 PROG GND 2 The WS4508E automatically terminates the charge cycle when the charge current drops to 1/10 the BAT 3 programmed value after the final float voltage is 4 VCC reached. Pin configuration (Top view) When the input supply (wall adapter or USB supply) is removed, the WS4508E automatically enters a low current state, dropping the battery drain current to less 5 than 0.5uA. The WS4508E can be put into shutdown 4 mode, reducing supply current to 45uA (Typ.). 4508 The WS4508E is available in a small package with YYWW SOT-23-5L. Standard product is Pb-Free. 1 Features 2 3  Programmable Charge Current Up to 600mA 4508 = Device Code  Over-Temperature Protection YY = Year  Under Voltage Lockout Protection WW = Week  Automatic Recharge Threshold 4.05V(Typ.)  Charge Status Output Pin  2.9V Trickle Charge Threshold  Soft-Start Limits Inrush Current Applications  Wireless phone  MP3/MP4 Player  Bluetooth device Will Semiconductor Ltd. Order information Device Package Shipping WS4508E-5/TR SOT-23-5L 3000/Reel&Tape 1 Jun, 2014 - Rev. 1.2 WS4508E Typical applications VIO VCHG 680K 1 CHGb 1K 2 PROG 1 uP 5 2 2K WS4508E Li-ion Battery 2K WS4508E GND GND 3 3 PROG 5 CHGb VCC BAT 4 Li-ion Battery VCC BAT 4 VCHG 10uF 10uF Typical applications W/T LED indicate Typical applications W/T microprocessor detect Pin descriptions Pin Number Pin Name 1 CHGb Function Open-Drain Charge Status Output. When the battery is charging, the CHGb pin is pulled low. When the charge cycle is completed or VCC is removed, the CHGb is forced high impedance. 2 GND Ground 3 BAT Charge Current Output. Provides charge current to the battery and regulates the final float voltage to 4.2V. 4 VCC 5 PROG Power Supply Charge current setting, charge current monitor and shutdown pin. The charging current is given by IBAT= (1/RPROG)*1000. The chip will be shutdown when PROG pin floating Block Diagram VCC 165°C TDIE 1X TA 1000X 5uA BAT MA R1 VA CA SHDNb R2 REF 1.2V C1 1V R3 R4 0.1V C2 CHGb To BAT 2.9V R5 3uA Vcc C3 PROG GND Will Semiconductor Ltd. 2 Jun, 2014 - Rev. 1.2 WS4508E Absolute Maximum ratings Parameter Symbol Rating Unit Supply Voltage VCC -0.3~8 V PROG Voltage VPROG -0.3~VCC V BAT Voltage VBAT -0.3~8 V CHGb Voltage VCHGb -0.3~VCC V BAT Pin Current IBAT 600 mA Power Dissipation – Note1 Pd 0.5 W Power Dissipation – Note2 Pd 0.3 W 150 o -45~85 o -65~125 o 260 o Junction Temperature Operation Temperature Storage Temperature Tj Top Tsg Lead Temperature (Soldering 10s) C C C C Thermal resistance characteristics Symbol Parameter Max. RJA1 Thermal Resistance, Junction to Ambient – Note1 RJA2 Thermal Resistance, Junction to Ambient – Note2 Unit 125 O C/W 415 O C/W Note1: Surface mounted on FR4 Board using 1 in sq pad size, 2oz Cu. Note2: Surface mounted on FR4 board using the minimum recommended pad size, 2oz Cu. Will Semiconductor Ltd. 3 Jun, 2014 - Rev. 1.2 WS4508E o Electronics Characteristics (VCC=5V, Ta=25 C, unless otherwise noted) Symbol Parameter Condition Typ. Max. Unit RPROG=2kΩ 650 2000 uA RPROG=10kΩ 240 2000 uA ISPLYCHRG Charge Mode Supply Current IBATCHRG Charge Mode Battery Current VPROGCHRG PROG Pin Voltage ISPLYSTBY Standby Mode Supply Current Charge Terminated IBATSTBY Standby Mode Battery Current Charge Terminated ISPLYASD Shutdown Mode Supply Current VCC