| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress the variation in output of an inverting charge pump circuit. Ž<P>SOLUTION: A charge pump circuit 100 inverts the polarity of the input voltage Vdd and outputs the polarity-inverted voltage. A first switch SW1 and a third switch SW3 are provided in a first path for charging a flying capacitor Cf with the input voltage Vdd. A second switch SW2 and a fourth switch SW4 are provided in a second path for transferring electric charges accumulated in the flying capacitor Cf to an output capacitor Co. A control circuit 10 alternately switches the switches SW1 and SW3 provided in the first path and the switches SW2 and SW4 provided in the second path on and off. The control circuit 10 changes the on-time of at least one of the switches SW1 to SW4 according to the output voltage Vss at one end P4 of the output capacitor Co. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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