Descriptions
The WS4518D 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 temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor.

FEATUREs
● Programmable Charge Current Up to 300mA
● Over-Temperature Protection
● Under Voltage Lockout Protection
● 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