Voltage booster circuit, power supply circuit, and liquid crystal driver

摘要

A charge-pump circuit includes: MOS transistors connected in series and having one end to which a system ground power supply voltage is supplied; and first to fifth discharge transistors having one end connected to the system ground power supply voltage and the other end connected to the MOS transistors. The MOS transistors are implemented by a triple-well structure formed in a p-type semiconductor substrate. When a discharge operation is performed, the first to fifth discharge transistors are separately ON/OFF controlled, thereby preventing parasitic bipolar transistor elements from being Darlington-connected and preventing a current path from being formed.