A structure and method are provided for converting unregulated DC voltages to regulated DC voltages using pulse frequency modulation (PFM) and a switched capacitor array capable of multiple gains, where gain selection is based on the output voltage. The selected gain is maintained at or above a minimum...http://www.google.ca/patents/US6055168?utm_source=gb-gplus-sharePatent US6055168 - Capacitor DC-DC converter with PFM and gain hopping
