Combined LDO regulator and battery charger

Details Combined LDO regulator and battery charger Combined LDO regulator and battery charger

2004-05-21

2008-12-02

Laxton, Gary L (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

C324S416000, C323S371000

Reexamination Certificate

active

07459886

ABSTRACT:
A method and circuit for simultaneously charging a battery and providing supply voltage to a load. The circuit includes a low-drop-out voltage (LDO) regulator and a constant-current, constant-voltage (CC-CV) regulator. In one embodiment, CC-CV regulator provides a control voltage to the LDO regulator generated by a voltage-controlled current source. As charge voltage approaches battery termination voltage, the control voltage is reduced regulating LDO regulator output to provide constant voltage while decreasing charge current to the battery. In another embodiment, a slow response amplifier and a current mirror in the CC-CV regulator provide a smooth and stable charging current to the battery that is decreased as battery charge approaches a full charge level, while maintaining constant supply voltage to the load. In a further embodiment, an externally programmable amplifier in the CC-CV regulator may enable use of the circuit with varying power sources.

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