Patent ID: 8860391

Claim:
A DC-DC converter which converts an input voltage input from an input terminal to a predetermined voltage and outputs the converted voltage from an output terminal, the DC-DC converter comprising: an output control transistor that carries out operation corresponding to a control signal input to a control electrode and controls the output voltage; and an operation control circuit that has an error amplifying circuit for amplifying a voltage difference between a predetermined reference voltage and a feedback voltage generated by dividing the output voltage and outputting the amplified voltage, and controls operation of the output control transistor to cause the output voltage to constantly be the predetermined voltage based on an error voltage, the error voltage being the output voltage difference, wherein the error amplifying circuit comprises: an output circuit configured to output the error voltage and include an output transistor of a source follower connection; a series circuit configured to include a resistor for phase compensation and a capacitor for phase compensation and be connected between a control electrode of the output circuit and a grounding voltage terminal; and an amplifying circuit configured to be positioned on a side more distant from a side outputting the error voltage relative to the output circuit in the error amplifying circuit, and include a voltage generating element as a load of the amplifying circuit.