Voltage regulator circuit having short-circuit protection circuit

摘要

A voltage regulator circuit includes a regulator circuit and a short-circuit protection circuit. The regulator circuit includes a first transistor and a first amplifier. The first amplifier outputs a gate voltage to a gate of the first transistor in response to a reference potential and a feedback potential such that the feedback potential coincides with the reference potential. The feedback potential is a fed back potential from the first transistor. The short-circuit protection circuit includes a second transistor, a first resistance, a second resistance and a second amplifier. The gate voltage is supplied to a gate of the second transistor. The first resistance connects a first terminal of the second transistor with a ground. The second resistance connects a second terminal of the second transistor with a power source. The second amplifier outputs a control voltage to the first amplifier in response to a bias potential and a potential of the first terminal to control the gate voltage.