Voltage regulator
View Patent ↗Provided is a voltage regulator for limiting a rush current from an output stage transistor. The voltage regulator includes an output current limiting circuit having a low detection current value and an output current limiting circuit having a high detection current value, and is structured so as to enable operation of the output current limiting circuit having a low detection current value during a time period from a state in which an overheat protection circuit detects overheat and an output current is stopped to a state in which an overheat protection is canceled and a predetermined time passes. Accordingly, after the overheat protection is cancelled, an excessive rush current can be limited.
1. A voltage regulator, comprising:
a first output current limiting circuit having a first detection current value;
a second output current limiting circuit having a second detection current value larger than the first detection current value;
an overheat protection circuit for detecting a temperature and outputting a detection signal indicating one of an overheated state and a normal state; and
a detection circuit for receiving an input of the detection signal of the overheat protection circuit and an input of a rising signal of an input voltage,
wherein the detection circuit enables operation of the first output current limiting circuit when the detection signal indicating the overheated state is input and during a time period from when the detection signal indicating the normal state is input to when a predetermined period of time passes.
2. A voltage regulator according to claim 1 , wherein the detection circuit enables operation of the first output current limiting circuit during a time period from when the rising signal of the input voltage is input to when the predetermined period of time passes.