Patent ID: 8102157

Claim:
A multi-output power supply device that converts a first input voltage input from an input terminal thereof to a plurality of voltages having predetermined different values, and outputs the voltages through a plurality of output terminals, respectively, said multi-output power supply device comprising: a first power supply circuit that generates a predetermined constant voltage from the first input voltage, and outputs the constant voltage through a first output terminal; and one or more second power supply circuits each including a charge pump circuit, said charge pump circuit using the output voltage of the first power supply circuit as a second input voltage, generating a predetermined constant voltage from the second input voltage, and outputting the predetermined constant voltage through a second output terminal, wherein each of the second power supply circuits changes a period of a charging and discharging cycle for charging and discharging a flying capacitor of the respective second power supply circuit according to an electric current output from the second output terminal, wherein each of the second power supply circuits includes a voltage conversion circuit that charges and discharges the flying capacitor according to a clock signal, converts the second input voltage, and outputs the converted second input voltage through the second output terminal, and a control circuit that controls voltage conversion in the voltage conversion circuit so that the voltage output from the second output terminal becomes the predetermined constant voltage, wherein the control circuit changes a frequency of a predetermined reference clock signal according to an electric current output from the second output terminal to generate the clock signal, and outputs the obtained clock signal to the voltage conversion circuit.