Patent ID: 7511564

Claim:
A voltage-booster power supply circuit comprising: a semiconductor integrated circuit operating in a first mode and a second mode; and an external circuitry connected to said semiconductor integrated circuit, wherein said semiconductor integrated circuit has: a first charge pump circuit and a second charge pump circuit each of which boosts a first voltage by using a capacitor to generate a second voltage in response to a control signal; and a selection circuit configured to output a first control signal and a second control signal as said control signal, which are out-of-phase with each other, respectively to said first charge pump circuit and said second charge pump circuit in said first mode, and to output an in-phase control signal as said control signal to said first charge pump circuit and said second charge pump circuit in said second mode, wherein in a case of said first mode, said external circuitry is provided with a first pumping capacitor and a second pumping capacitor that are connected as said capacitor to said first charge pump circuit and said second charge pump circuit, respectively, wherein in a case of said second mode, said external circuitry is provided with a common pumping capacitor that is connected as said capacitor to said first charge pump circuit and said second charge pump circuit in common.