| 摘要 |
PROBLEM TO BE SOLVED: To provide a charge pump circuit as a high voltage side switch of low noise and high efficiency which can be easily integrated in an integrated circuit together with an MOS gate control power device. SOLUTION: This charge pump circuit consists of the following; a power MOSFET 32 supplying a power supply voltage Vcc to a connected load when it is turned on, a charge pump circuit 40 which outputs a voltage higher than the power supply voltage Vcc to the gate of a power MOSFET 32 and makes it turn on, and a constant current source 53 which is connected between the charge pump circuit 40 and a connection node 52 and makes the reference potential of the charge pump circuit to float. |
