Overcurrent protection circuit, semiconductor device and voltage regulator

A voltage regulator, comprising:

• an output transistor which outputs a predetermined output voltage to an output terminal;
• an error amplifier circuit which amplifies and outputs a difference between a divided voltage obtained by dividing the output voltage and a reference voltage, and controls a gate of the output transistor;
• and
• an overcurrent protection circuit,
• wherein the overcurrent protection circuit includes a first transistor which allows a current proportional to an output current flowing through the output transistor to flow,
• a constant current circuit which allows a reference current to flow;
• a comparison circuit which compares the current flowing through the first transistor and the reference current, and
• a control circuit which controls a bias current of the error amplifier circuit by a signal outputted from the comparison circuit.