Patent ID: 7649403

Claim:
An internal voltage generating circuit for stably supplying a high voltage, comprising: a supply driving control unit for receiving a driving signal and generating a supply driving control signal in response to the received driving signal, wherein the supply driving control unit is controlled by the received driving signal; a pumping control signal generating unit for receiving the driving signal and outputting pumping control signals in response to only the received driving signal during an active mode, wherein the pumping control signal generating unit is controlled by only the received driving signal; and a charge pump unit for generating a high voltage being higher than an external voltage in response to the pumping control signals outputted from the pumping control signal generating unit and the supply driving control signal generated from the supply driving control unit, wherein the supply driving control unit includes: an output control signal generator for outputting its input signal as the output control signal for controlling an output time point of the charge pump unit; and a level shifter for shifting a level of the output control signal of the output control signal generator to output the supply driving control signal swing between a high voltage and a ground voltage, wherein the supply driving control signal of the supply driving control unit is not inputted to the pumping control signal generating unit, wherein the pumping control signal generating unit includes: a first delay unit for inverting and delaying an input signal to output a first delay signal: a second delay unit for delaying the first delay signal to output a second delay signal: a third delay unit for inverting and delaying the first delay signal to output a third delay signal: and a signal generating unit for generating the plurality of pumping control signals for controlling a driving of the charge pump unit through a logic combination of the first to the third delay signals, wherein the first delay unit is an inverter chain configured with three inverters. the second delay unit is an inverter chain configured with six inverters. and the third delay unit is an inverter chain configured with five inverters.