Patent ID: 7705579

Claim:
A circuit for regulation, comprising: a buck regulator controller, wherein the buck regulator controller is arranged to provide a first switch control signal to control a first switch to control an inductor current, and further arranged to provide a synchronous switch control signal to control a synchronous switch, wherein the buck regulator controller includes: an unloading event detection circuit that is arranged to assert an unload event signal if an unloading event is detected; an inductor current detection circuit that is arranged to assert an inductor current detection signal if the inductor current is approximately zero; and a synchronous switch control logic circuit that is arranged to provide the synchronous switch control signal, wherein the synchronous switch control logic circuit is arranged to provide the synchronous switch control signal such that: if the unload event signal is asserted, and the inductor current detection signal is not asserted, the synchronous switch control logic circuit blocks the synchronous switch from turning on; and such that the synchronous switch control logic circuit stops blocking the synchronous switch from turning on if the inductor current detection signal is asserted.