VOLTAGE REGULATOR

摘要

To provide a voltage regulator capable of using as a capacitor of a phase compensation circuit, a capacitor large in capacitance value per unit area and thin in oxidation film thickness. A voltage limitation circuit that limits so that a voltage applied across a capacitor of a phase compensation circuit does not reach a predetermined value or greater is provided in parallel with the capacitor.

主权项

1. A voltage regulator comprising:
a differential amplifier circuit that is inputted with a reference voltage and a feedback voltage obtained by dividing an output voltage of the voltage regulator and outputs a control voltage obtained by amplifying a difference between the reference voltage and the feedback voltage; a source-grounded amplifier circuit that has an input terminal to which an output terminal of the differential amplifier circuit is connected and amplifies the control voltage; a phase compensation circuit provided between the input terminal of the source-grounded amplifier circuit and an output terminal thereof; an output transistor that has a gate to which the output terminal of the source-grounded amplifier circuit is connected and controls the output voltage of the voltage regulator; and a voltage limitation circuit that is connected in parallel with a capacitor configuring the phase compensation circuit and controls a voltage applied across the capacitor so as not to be a predetermined voltage or greater.