Overcurrent limitation and output short-circuit protection circuit, voltage regulator using overcurrent limitation and output short-circuit protection circuit, and electronic equipment

摘要

A disclosed overcurrent protection and output short-circuit protection circuit has a proportional output current generation unit and a first current voltage conversion unit provided in series between a first power supply terminal and an output terminal. Furthermore, the overcurrent protection and output short-circuit protection circuit has a control unit that operates based on a difference between a voltage generated at the first current voltage conversion unit and that generated at a second current voltage conversion unit provided between the first power supply terminal and a second power supply terminal. A current flowing to the second current voltage conversion unit is changed by one or more switching elements in a stepwise manner based on the output voltages of the output transistor when supplying the current, thereby changing the voltages generated at both ends of the second current voltage conversion unit.