Patent ID: 7541859
Filing Date: 2009-06-02
Classification: H02M

Abstract:
1. A charge pump circuit comprising: an input terminal to which an input voltage is input; an output terminal from which an output voltage is output; a ground terminal; capacitor means having at least a first capacitor and a second capacitor; a first switch connected between said input terminal and one terminal of said first capacitor; a second switch connected between the other terminal of said first capacitor and one terminal of said second capacitor; a third switch connected between said input terminal and the other terminal of said second capacitor; a fourth switch connected between the one terminal of said first capacitor and the one terminal of said second capacitor; a fifth switch connected between the one terminal of said first capacitor and said output terminal; a sixth switch connected between the other terminal of said second capacitor and said ground terminal; a seventh switch connected between the other terminal of said first capacitor and the other terminal of said second capacitor; and a control circuit for controlling the ON/OFF operations of said respective switches, wherein said control circuit has: a 2Vi mode for alternately repeating a first state wherein said first capacitor and said second capacitor are connected in parallel and charged by said input voltage, and a second state wherein said first capacitor and said second capacitor are connected in parallel between said input and output terminals and discharged to the output side; and a 1.5Vi mode for alternately repeating a third state wherein said first capacitor and said second capacitor are connected in series and charged by said input voltage, and a fourth state wherein said first capacitor and said second capacitor are connected in parallel between said input and output terminals and discharged to the output side.