Patent ID: 7742346

Claim:
A voltage booster, comprising: at least one first stage voltage pump, comprising a first pump circuit, wherein the first pump circuit transfers electronic charges from a supply voltage to a first node voltage; at least one second stage voltage pump, coupled to the first stage voltage pump, the second stage voltage pump comprising a second pump circuit, a third pump circuit, and an enabling circuit, wherein the enabling circuit controls on or off states of the third pump circuit according to an active signal, and the second pump circuit transfers electronic charges from the first node voltage to a second node voltage; and a switch, coupled to the second stage voltage pump; wherein when the third pump circuit is in normal operation, the third pump circuit transfers electronic charges from the second node voltage to an output voltage, and when the third pump circuit is turned off, the switch conducts the second node voltage as the output voltage, and the current of the output voltage is provided by the second pump circuit; and the first stage voltage pump further comprises: a first driving circuit, enhancing a first pulse signal and a second pulse signal and outputting the enhanced first pulse signal and the enhanced second pulse signal to the first pump circuit; a second driving circuit, enhancing a third pulse signal; and a first coupling element, coupling the third pulse signal enhanced by the second driving circuit to the first node voltage in order to boost the first node voltage.