Adaptive multi-mode system

A control system controls an output regulator, which converts an input voltage to a regulated output. The output regulator includes a power stage that generates a power output from the input voltage and an output filter that filters the power output to generate the regulated output. The control system comprises a digital controller, which is responsive to a sense signal corresponding to the regulated output, that generates a drive signal to control the power stage. The digital controller includes and selects between at least three operating modes. A selected one of the operating modes generates the drive signal.