Patent ID: 7397677

Claim:
A charge pump circuit, comprising: an error amplifier that is operable to provide an error signal that is based, in part, on at least one of an output voltage or a load current; an adjustable resistance circuit that is operable such that a resistance across the adjustable resistance circuit is approximately proportional to the error signal, wherein the adjustable resistance circuit is arranged such that the error amplifier drives the adjustable resistance circuit; and a plurality of switch circuits that is operable to enable: during a sample phase, coupling a flying capacitor in series with the adjustable resistance circuit, wherein the plurality of switch circuits includes: a first switch circuit that is coupled to a first flying capacitor node; a second switch circuit; a third switch circuit that is coupled to a second flying capacitor node, wherein the charge pump circuit is arranged to operate with the flying capacitor coupled between the first flying capacitor node and the second flying capacitor node; a fourth switch circuit that is coupled between the second flying capacitor node and a third flying capacitor node; a fifth switch circuit that is coupled to the third flying capacitor node; a sixth switch circuit that is coupled to a fourth flying capacitor node, wherein the charge pump circuit controller is arranged to operate with a second flying capacitor between the third flying capacitor node and the fourth flying capacitor node; and a seventh switch circuit that is coupled between the fourth flying capacitor node and an output node.