A digital controller that controls an output regulator includes controller sub-blocks that perform sub-functions of the digital controller, wherein at least one of the controller sub-blocks includes at least one of a delay line and a first comparator. A controller monitors output power states of the output regulator and controls flow of power to the at least one of the controller sub-blocks of the digital controller to reduce power consumption of the digital controller during selected ones of the output power states of the output regulator.