Patent ID: 8717699

Claim:
A voltage booster comprising: an input for receiving an input voltage Vin; a first charging capacitor C 1 ; a second charging capacitor C 2 ; an output capacitor Cout; and control circuitry operable to charge the output capacitor Cout to four times Vin by: connecting C 1 in parallel with Vin to charge C 1 to Vin; after charging C 1 to Vin, connecting C 2 in parallel with Vin plus C 1 to charge C 2 to twice Vin; after charging C 2 to twice Vin, connecting C 1 in parallel with Vin to recharge C 1 to Vin; and after recharging C 1 , connecting Cout in parallel with Vin plus C 1 plus C 2 to charge Cout to four times Vin.