Patent ID: 7276885

Claim:
A power management unit, comprising: a first regulator control circuit that is arranged to provide a first output voltage, wherein the first regulator control circuit performs regulation based, in part, on a difference between a first feedback signal and a first reference voltage; a second regulator control circuit that is arranged to provide a second output voltage, wherein the second regulator control circuit performs regulation based, in part, on a difference between a second feedback signal and a second reference voltage; a first plurality of resistive elements that is arranged to receive a first reference current, and further arranged to provide the first reference voltage based, in part, on the first reference current; a first plurality of switch circuits coupled to the first plurality of resistive elements, wherein the switch circuits of the first plurality of switch circuits are arranged to open and close responsive to a first switch control signal; a first state machine that is arranged to provide the first switch control signal as a multi-bit digital signal having a value that changes over time during a power-up sequence such that a total equivalent resistance of the first plurality of resistive elements increases in a time-controlled manner during the power-up sequence; a second plurality of resistive elements that is arranged to receive a second reference current, and further arranged to provide the second reference voltage based, in part, on the second reference current; and a second plurality of switch circuits coupled to the second plurality of resistive elements, wherein the switch circuits of the second plurality of switch circuits are arranged to open and close responsive to a second switch control signal.