Patent ID: 7075359

Claim:
A two phase internal voltage generator, comprising a first phase internal voltage generator for providing a first internal voltage source upon receiving an external voltage source, wherein the first phase internal voltage generator comprising: a comparator, for comparing a reference voltage and a feedback voltage, outputting a control voltage; a power transistor, wherein the gate terminal of the power transistor couples to the control voltage, the first source/drain terminal of the power transistor couples to the external voltage source, and the second source/drain terminal of the power transistor couples to the first internal voltage source; a first resistor, having a first terminal and a second terminal, wherein the first terminal couples to the second source/drain terminal of the power transistor; and a second resistor, having a first terminal and a second terminal, wherein the first terminal couples to the second terminal of the first resistor so as to provide the feedback voltage, and the second terminal is grounded; and a second phase internal voltage generator for providing a second internal voltage source, the second phase internal voltage generator consumes relatively lower power than the first phase internal voltage generator; wherein as the second internal voltage source that is provided by the second phase internal voltage generator is steadied, the first internal voltage source that is supplied by the first phase internal voltage generator is cut off thereby; wherein the second phase internal voltage generator is turned on substantially immediately after the first internal voltage source is provided.