CHARGE PUMP CIRCUIT, ITS DRIVE METHOD, AND VOLTAGE CONVERSION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To obtain a charge pump circuit that can improve booster efficiency. SOLUTION: In a first booster stage 1, an external power voltage Vcc is supplied via a first gate transistor T11. The first booster stage 11 is connected to a second one 12 via a second gate transistor T12. Also, the second booster stage 12 outputs an internal power supply voltage Vout via a third gate transistor T13. Each of other end of the first and second booster stages 11 and 12 is connected to each drive circuit 21. A bypass transistor TB is connected between the second and third gate transistors T12 and T13. The bypass transistor TB are turned on and off by the drive circuit 21 with the third gate transistor T13, thus carrying out single-stage booster pumping operation using a fist booster stage 1.