Patent ID: 8134403
Filing Date: 2012-03-13
Classification: H02M,Y02B

Abstract:
1. A charge pump comprising: a flying capacitor configured to be switched between at least two states, wherein the flying capacitor is configured to provide the output voltage from an input voltage; a plurality of switching devices coupled in parallel between the input voltage and the flying capacitor, the plurality of switching devices configured to selectively provide a variable available drive current to the flying capacitor; a first comparator configured to compare the output voltage to a first reference voltage and to provide a first feedback signal using the comparison; a second comparator configured to compare the output voltage to a second reference voltage and to provide a second feedback signal using the comparison; a logic circuit configured to select at least one of the plurality of switching devices to provide the variable available drive current to the flying capacitor, wherein the logic circuit selects the at least one of the plurality of switching devices using the first and second feedback signals from the first and second comparators, wherein the variable available drive current is configured to vary depending on the selected at least one of the plurality of switching devices; and wherein the plurality of switching devices include binary devices having an ON state and an OFF state, the binary devices configured to provide a discrete magnitude of available drive current in the ON state and an insignificant magnitude of available drive current in the OFF state.