Patent ID: 7489109

Claim:
An integrated battery charger and system regulator, comprising: a converter having a first terminal coupled to an input node for receiving an input voltage, a second terminal coupled to a system node, and a control terminal for controlling said converter to convert said input voltage to a system voltage on said system node; a regulator device having a control terminal and first and second terminals forming a controlled current path coupled in a charge path of a rechargeable battery, said first terminal coupled to said system node; a current sensing device that senses charge current of said charge path; and a controller, coupled to said current sensing device, said converter control input and said regulator device control terminal, that controls said converter to regulate said system voltage between minimum and maximum voltage levels and that operates in a plurality of modes, including a trickle charging mode for controlling said regulator device to maintain said system node at said minimum voltage level, a current charging mode for regulating said charge current, and a voltage control mode for maintaining said system node at said maximum voltage level.