Voltage-dropping power unit for semiconductor memory device

Abstract

A voltage dropping power unit is provided which is capable of reducing power consumption in the voltage dropping power unit while a semiconductor memory device is placed in a quiescent state. The voltage dropping power unit is provided with a voltage control circuit to supply a dropped voltage controlled depending on a control voltage to the semiconductor memory device, a reference circuit to generate a reference voltage used to produce a control voltage and a differential circuit to make the dropped voltage equal to the reference voltage irrespective of a level of a voltage output from the voltage control circuit. The reference circuit has a voltage dividing resistor used to produce a reference voltage and a switching device used to form a short-circuit across the voltage dividing resistor.

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