High voltage generating circuit and method for generating a signal maintaining high voltage and current characteristics therewith

摘要

A high voltage generating circuit includes a charge pump unit for generating a high voltage by pumping or precharging an external source voltage in accordance with externally generated first and second clock signals and first and second high voltage clock signals, a voltage control unit for generating a voltage control signal in accordance with a high voltage signal output from the charge pump unit and an externally generated enable signal, controlling the high voltage signal of the charge pump unit to a predetermined voltage level, and outputting a final output signal to an external memory cell, and a high voltage clock generating unit for level-shifting the first and second clock signals output from an external clock generator in accordance with the voltage control signal output from the voltage control unit and the externally generated enable signal, and outputting the first and second high voltage clock signals to the charge pump unit. The circuit decreases an unnecessary power consumption by maintaining a regular output voltage without regard to the variation of the external source voltage when generating a high voltage and a high current which are required to program or erase a flash memory.