Patent ID: 8314648

Claim:
A charge-pumping power supply circuit for boosting an input supply voltage from outside, comprising: a booster section including a first main boosting capacitor and a first input-side and a first output-side switching elements connected with a first terminal of the first main boosting capacitor, for boosting a voltage supplied to the first main boosting capacitor via the first input-side switching element and outputting a boosted voltage as a boosted supply voltage via the first output-side switching element; and a booster control section for causing the first input-side and the first output-side switching elements to turn on and off oppositely to each other, the booster control section including a first control-boosting switching element provided by an N-channel transistor of a positive threshold voltage; a first control-boosting capacitor having a first terminal connected with the control terminal of the first output-side switching element, as well as with the first terminal of the first main boosting capacitor via the first control-boosting switching element; wherein each of the first input-side and the first output-side switching elements is provided by an N-channel transistor of a positive threshold voltage, and wherein the booster control section boosts the boosted voltage supplied from the first main boosting capacitor to the first control-boosting capacitor via the first control-boosting switching element, thereby supplying the control terminal of the first output-side switching element with a voltage which is higher than the boosted voltage by at least the threshold voltage of the first output-side switching element, when turning on the first output-side switching element.