Voltage regulator and method of controlling voltage regulator

A method of controlling a voltage regulator which includes a current source configured to drive a differential amplifier circuit, a first input transistor, and a second input transistor, the first input transistor being a PMOS transistor containing a source connected to a current source output terminal of the current source via a tail connection point and containing a gate to which a reference voltage is input, the second input transistor being a PMOS transistor containing a source connected to the tail connection point and containing a gate connected to an output terminal, the voltage regulator being configured to control, if a short circuit occurs between the output terminal configured to output a predetermined output voltage and a ground, a gate-source voltage of each of the first input transistor and the second input transistor in the differential amplifier circuit configured to control the predetermined output voltage the method comprising:

• preparing a voltage controller including at least one of a first voltage control circuit which is interposed between the tail connection point and the gate of the first input transistor and is configured to control a voltage at the tail connection point based on a voltage at the gate of the first input transistor, a second voltage control circuit which contains a first port connected to the gate of the first input transistor, a second port connected to a grounding point, and a third port connected to the gate of the second input transistor and is configured to control the voltage at the gate of the first input transistor based on a voltage at the gate of the second input transistor, a third voltage control circuit which is interposed between the tail connection point and the gate of the second input transistor and is configured to control the voltage at the tail connection point based on the voltage at the gate of the second input transistor, and a fourth voltage control circuit which contains a first port connected to the gate of the second input transistor, a second port connected to the grounding point, and a third port connected to the gate of the first input transistor and is configured to control the voltage at the gate of the second input transistor based on the voltage at the gate of the first input transistor;
• and
• performing a voltage control by the voltage controller, the voltage control including at least one of controlling a voltage at the tail connection point based on a voltage at the gate of the first input transistor, controlling the voltage at the gate of the first input transistor based on a voltage at the gate of the second input transistor, controlling the voltage at the tail connection point based on the voltage at the gate of the second input transistor, and controlling the voltage at the gate of the second input transistor based on a voltage at the gate of the second input transistor.