Patent ID: 8593120
Filing Date: 2013-11-26
Classification: G05F

Abstract:
1. A voltage regulator comprising: a reference voltage circuit which outputs a reference voltage; an output transistor; a first differential amplifier circuit which amplifies and outputs a difference between the reference voltage and a divided voltage obtained by dividing a voltage output from the output transistor and controls a gate of the output transistor; an inrush current protection circuit which controls a gate voltage of the output transistor to prevent an inrush current; and an output voltage detection circuit which controls the inrush current protection circuit, wherein the inrush current protection circuit comprises: a constant-current circuit having one end thereof connected to a power supply terminal; a first transistor having a source thereof connected to the other end of the constant-current circuit and a gate thereof controlled by the output voltage detection circuit; a capacitor having one end thereof connected to a drain of the first transistor and the other end thereof connected to the gate of the output transistor; a second transistor having a gate thereof connected to the source of the first transistor and a source thereof connected to the power supply terminal; and a third transistor having a drain thereof connected to the gate of the output transistor, a source thereof connected to a drain of the second transistor and a gate thereof controlled by the output voltage detection circuit.