Patent ID: 8525496

Claim:
A DC-DC converter comprising: an output terminal which outputs an output voltage; a first MOS transistor of a first conductivity type connected at a first end thereof to a first voltage line, a first voltage being applied to the first voltage line; a second MOS transistor of a second conductivity type connected at a first end thereof to a second end of the first MOS transistor and connected at a second end thereof to a second voltage line, a second voltage being applied to the first voltage line and being different from the first voltage; a third MOS transistor of the first conductivity type connected at a first end thereof to the first voltage line; a fourth MOS transistor of the second conductivity type connected at a first end thereof to a second end of the third MOS transistor and connected at a second end thereof to the second voltage line; a first inductor connected between the second end of the first MOS transistor and the output terminal; a second inductor connected between the second end of the third MOS transistor and the output terminal; a first capacitor connected between a gate of the second MOS transistor and the second end of the third MOS transistor; a second capacitor connected between a gate of the fourth MOS transistor and the second end of the first MOS transistor; a third capacitor connected at a first end thereof to the second end of the first MOS transistor and connected at a second end to the second end of the third MOS transistor; a first resistor connected at a first end to the gate of the second MOS transistor; a second resistor connected at a first end thereof to the gate of the fourth MOS transistor; and a first bias adjustment circuit which compares the output voltage with a preset first reference voltage and which applies a first bias voltage to a second end of the first resistor and a second end of the second resistor to make the output voltage equal to the first reference voltage.