Patent ID: 7852139

Claim:
An apparatus for generating a plurality of internal voltages in a semiconductor integrated circuit, the apparatus comprising: a first voltage generating unit configured to generate a first internal voltage by detecting a feedback voltage level of the first internal voltage and performing a pumping operation based on the detected feedback voltage level to generate the first internal voltage; and a second voltage generating unit configured to generate a second internal voltage by detecting a feedback voltage level of the second internal voltage, performing level shifting on the detected feedback voltage level, receiving the first internal voltage, and generating the second internal voltage based on the level shifted feedback voltage signal and the received first internal voltage, wherein the second voltage generating unit includes: a second detecting unit configured to detect the level of the fed back second internal voltage to thereby generate a second detecting signal; a level shifter configured to control a voltage level of the second detecting signal when the second detecting signal is enabled to thereby generate a driving control signal; and a driving unit configured to receive the first internal voltage to control the level of the second internal voltage when the driving control signal is enabled, and to not receive the first internal voltage when the driving control signal is disabled.