Patent ID: 7709976

Claim:
A power supply system comprising: a first input for providing power from a first power source to a load, a second input for providing power from a second power source to the load, an input selector circuit coupled to the first input and the second input to select the first input or the second input, and a power regulator configured for operating in a buck-boost mode and having a single inductor device and a first transistor device for converting an input signal into a regulated output signal supplied to the load, the input selector circuit controlling the first transistor device to be activated if the first input is selected, and having a second transistor device controlled to be activated if the second input is selected, the first input being electrically connected directly to the first transistor device, the second input being electrically connected directly to the second transistor device, and the first and second transistor devices being electrically connected to the single inductor device.