Patent ID: 7233462
Filing Date: 2007-06-19
Classification: G05F,H02H

Abstract:
1. A voltage regulator, comprising: a dividing resistance circuit for dividing an output voltage of the voltage regulator; a reference voltage circuit; an error amplifier for comparing a voltage of the dividing resistance circuit with a voltage of the reference voltage circuit; an output transistor for controlling the output voltage of the voltage regulator while receiving an output of the error amplifier; and an overcurrent protection circuit comprising a first transistor having a gate connected to a gate of the output transistor, a resistor connected to a drain of the first transistor, an output voltage detecting transistor having a gate connected to an output terminal of the dividing resistance circuit, a current mirror circuit having an input terminal connected to the drain of the output voltage detecting transistor, a second transistor having a gate connected to the drain of the first transistor and a drain connected to an output terminal of the current mirror circuit, and a third transistor having a gate connected to the output terminal of the current mirror circuit and a drain connected to the gate of the output transistor.