Patent ID: 6753721
Filing Date: 2004-06-22
Classification: G05F

Abstract:
An internal step-down power supply circuit, comprising:an internal step-down power-supply output node that outputs an internal step-down power supply potential; a driver that adjusts an external power-supply potential and outputs the adjusted external power-supply potential to the internal step-down power-supply output node; a divider circuit that divides a voltage developed at the internal step-down power-supply output node and outputs outputting a divided voltage therefrom; and a differential amplifier that compares the voltage outputted from the divider circuit and a reference voltage and that outputs a voltage equivalent to twice a predetermined gain, the differential amplifier setting a conductance of each of first transistors that feed a current in response to the reference voltage to twice or more a conductance of each of second transistors that feed a current in response to the voltage outputted from the divider circuit.