Constant voltage generating circuit and constant voltage generating method for generating a constant voltage with respect to a variable power supply voltage without using a regulator

摘要

Disclosed herein are a constant voltage generating circuit and a constant voltage generating method. According to an embodiment of the present invention, the constant voltage generating circuit includes a voltage distribution unit performing voltage drop on a variable input power, a reference voltage and register bit generation unit outputting a band gap reference voltage and register bit, a comparison control unit comparing an input voltage dropped in the voltage distribution unit and the band gap reference voltage output from the reference voltage and register bit generation unit, and controlling the reference voltage and register bit generation unit or a constant voltage generation unit in accordance with the compared result, and a constant voltage generation unit receiving the variable input power by an operation of a switch corresponding to the register bit to thereby output a constant voltage, in accordance with the control of the comparison control unit.

主权项

1. A constant voltage generating circuit, comprising:
a voltage distribution unit performing voltage drop on a variable input power in accordance with a preset ratio; a reference voltage and register bit generation unit outputting a band gap reference voltage and a register bit in accordance with an output of a controller of a comparison control unit; the comparison control unit comparing an output of the voltage distribution unit and the band gap reference voltage output from the reference voltage and register bit generation unit, and controlling the reference voltage and register bit generation unit or a constant voltage generation unit in accordance with the compared result; and the constant voltage generation unit receiving the variable input power by an operation of a switch corresponding to the register bit to thereby output a constant voltage, in accordance with the output of the controller of the comparison control unit.