Optical pointing device including power supply voltage drop portion and power supply voltage boost portion, and power supply semiconductor device therefor

Abstract

An optical pointing device and a power supply semiconductor device therefore are provided. The optical pointing device includes at least one power supply voltage drop portion, wherein each of the power supply voltage drop portion comprises: a voltage-drop regulator for outputting a dropped power supply voltage; a first reference voltage generator for generating a first reference voltage; a first voltage division controller for outputting first and second drop voltage division control signals according to the moving velocity; a first voltage divider for outputting a first varied division voltage in response to the first and second drop voltage division control signals; a first comparator for comparing the level of the first varied division voltage with the level of the first reference voltage to output a first comparison output signal; and a first switch controller for dropping the output voltage of the voltage-drop regulator in response to the first comparison output signal.