Patent ID: 8587283

Claim:
A voltage converter system to provide an output voltage, comprising: a switching voltage converter having an inductor and arranged to switch through said inductor first and second currents with duty cycles controlled by an error voltage to thereby maintain said output voltage; a first amplifier having an amplifier output that provides said error voltage in response to said output voltage and a reference voltage; a differential amplifier arranged to provide a ripple current to said first amplifier output in response to the difference between said error voltage and a clamp voltage; and a current comparator arranged to provide a skip signal to turn off said first and second currents in response to a selected first threshold of said ripple current, said current comparator arranged to retract said skip signal in response to a selected second threshold of said ripple current; wherein said current comparator includes: a first current mirror arranged to provide, at a comparison node, a mirror current proportional to said ripple current; a current sink, coupled to the comparison node to receive the mirror current proportional to said ripple current, the current sink including first and second current sink legs configured to provide respective first and second sink currents at the comparison node, at least one of the first and second sink currents being switchably isolatable from the comparison node; and a switch arranged to switchably isolate said second current sink leg of said current sink from said comparison node.