Patent ID: 8541993

Claim:
A DC-DC converter comprising: an inductor operably connected between a first node and an output node; a high side switch operably connected between a high side supply input node and the first node; a low side switch operably connected between a low side supply input node and the first node; switch control circuitry operable to control the turn on of said high side switch based on a comparison of at least a first signal indicative of the current flow in the inductor with a second signal indicative of a difference between the voltage at the output node and a target voltage; said switch control circuitry being operable such that said low side switch may be turned off before said comparison indicates that the high side switch should be turned on; wherein the switch control circuitry comprises emulation circuitry for emulating the change in inductor current during a period when both the high side and low side switches are turned off.