Patent ID: 7459886

Claim:
A circuit for charging a battery and providing a supply voltage to a load, comprising: a voltage regulator that is arranged to receive an input power signal from a power source, a feedback signal, and a control signal, wherein the voltage regulator is further arranged to provide a regulated output signal to the load in response to the feedback signal and in response to the control signal, wherein the feedback signal is based, at least in part, on the regulated output signal; and a constant current, constant voltage (CC-CV) current regulator that is arranged to provide a charging signal to the battery, and to provide the control signal to the voltage regulator such that a current of the charging signal is maintained at a substantially constant value during a constant current mode and is reduced in response to a battery charge status during a constant voltage mode, wherein the voltage regulator and the CC-CV current regulator are arranged such that the regulated output signal and the charging signal to the battery are simultaneously provided during the constant current mode, wherein the regulated output signal and the charging signal are separate signals, and wherein the voltage regulator is arranged such that the a voltage of the regulated output signal is maintained at a substantially constant value independent of the value of the current of the charging signal.