DC-DC converter with adaptive phase compensation controller

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.