Voltage regulator

A voltage regulator, comprising:

• an output transistor having a source connected to a first power supply terminal;
• an output terminal from which a voltage at a drain of the output transistor is output, and connected to a power supply input terminal of an external load,;
• a first voltage divider circuit having a first resistor and a second resistor connected in series between the drain of the output transistor and a second power supply terminal via a first node;
• a load voltage monitoring terminal to which a voltage at the power supply input terminal of the external load is input;
• a second voltage divider circuit having a third resistor and a fourth resistor connected in series between the load voltage monitoring terminal and the second power supply terminal via a second node;
• a fifth resistor and a first switching transistor connected in series between the first node and the second power supply terminal;
• and
• a first comparator connected between the first power supply terminal and the second power supply terminal, and is configured to:
• compare a voltage at the first node and a voltage at the second node to each other;
• and
• output a signal for turning on the first switching transistor when the voltage at the second node falls below the voltage at the first node by a first predetermined voltage amount or more,
• a ratio between a resistance value of the first resistor and a resistance value of the second resistor being the same as a ratio between a resistance value of the third resistor and a resistance value of the fourth resistor, and
• a voltage at a gate of the output transistor being reduced so that a voltage at the output terminal is raised when the voltage at the first node falls below a reference voltage.