Patent ID: 7880530

Claim:
A power supply circuit that boosts a given voltage to generate one or more power supply voltages, the power supply circuit comprising: a charge-pump control circuit including switching elements for generating a boost voltage by a charge-pump operation using charge stored in a flying capacitor; a soft-start circuit that prevents a rush current from flowing into the flying capacitor; and a power supply generation circuit that is connected with a stabilization capacitor and generates a power supply voltage using the boost voltage as a power; supply, after the power supply generation circuit has been turned ON in a state in which the charge-pump control circuit generates the boost voltage by the charge-pump operation, the switching elements being turned OFF, and the soft-start circuit generating the boost voltage by a charge-pump operation, and the soft-start circuit including switching elements provided in parallel with the switching elements of the charge-pump control circuit and having an on-resistance higher than those of the switching elements of the charge-pump control circuit.