Patent ID: 7663427

Claim:
A charge pump type booster circuit generating a positive or negative boosted output voltage by switching booster paths one by one, the charge pump type booster circuit comprising: a plurality of booster paths, each of the plurality of booster paths including at least one booster capacitor, wherein a number of the booster capacitor at each of the plurality of booster paths is different between one booster path and another booster path, wherein the plurality of booster paths includes: a first booster path outputting a first output voltage obtained by boosting an input voltage, the first booster path including at least a first booster capacitor and a third booster capacitor; and a second booster path outputting a second output voltage obtained by boosting the input voltage, the second booster path including at least a second booster capacitor, wherein the first booster path further comprises a first switch group including: a first switch unit between a first power supply potential and the first booster capacitor; a second switch unit between the first booster capacitor and the third booster capacitor; and a third switch unit between the third booster capacitor and an output terminal.