Patent ID: 8618783

Claim:
A DC-DC converter for generating an output voltage from an input voltage, comprising: an output stage to output the output voltage generated based on the input voltage; an error amplifier having an input for receiving a feedback voltage in accordance with the output voltage, a first input for receiving a reference voltage and an output for generating an amplified voltage which drives the output stage, the amplified voltage corresponding to the difference between the feedback voltage and the reference voltage; a phase compensation circuit to adjust a phase of the feedback voltage; and a phase compensation controller to control a phase compensation component of the phase compensation circuit based on the input voltage and the output voltage, wherein the phase compensation circuit includes a variable capacitor having a transistor whose backgate is coupled to a second input of the error amplifier, wherein a capacitance of the variable capacitor is controlled based on a control voltage so as to become small when the control voltage becomes large and to become large when the control voltage becomes small, wherein the control voltage is generated by amplifying a voltage difference between the input voltage and the output voltage.