Patent ID: 8063619

Claim:
An information handling system comprising: plural components operable to process information; a chipset interfaced with the plural components and operable to coordinate interactions of the plural components; a power supply operable to provide power to the plural components and the chipset; and a voltage regulator controller interfaced with the power supply and operable to supply power to the chipset, the voltage regulator controller having first and second phases, the first phase interfaced with a first power rail to provide power to the chipset in a first power state, the second phase interfaced with a second power rail to provide power to the chipset in a second power state; a switch disposed between the first and second power rails, the switch operable to interface the first and second power rails in the second power state and disconnect the first and second power rails in the first power state; a first voltage sense associated with the first power rail and interfaced with the voltage regulator controller; and a second voltage sense associate with the second power rail and interfaced with the voltage regulator controller; wherein the voltage regulator controller uses the first voltage sense to control output of the first phase in the first power state and combines the first and second voltage senses to control output of the first and second phases in the second power state.