The ADP3820 is a precision single cell Li-Ion battery charge controller that can be used with an external Power PMOS device to form a two-chip, low cost, low dropout linear battery charger. It is available in two voltage options to accommodate Li-Ion batteries with coke or graphite anodes. The ADP3820's high accuracy ( 1%) low shutdown current (1 A) and easy charge current programming make this device especially attractive as a battery charge controller. Charge current can be set by an external resistor. For example, 50 m of resistance can be used to set the charge current to 1 A. Additional features of this device include foldback current limit, overload recovery, and a gate-to-source voltage clamp to protect the external MOSFET. The proprietary circuit also minimizes the reverse leakage current from the battery if the input voltage of the charger is disconnected. This feature eliminates the need for an external serial blocking diode.