Patent ID: 7330020
Filing Date: 2008-02-12
Classification: H02M

Abstract:
1. A voltage regulation unit for receiving a driving voltage outputted from a charge pump and regulating the driving voltage, the voltage regulation unit comprising: a current mapping unit, which comprises a master current end and a slave current end, for receiving the driving voltage and generating a first current signal and a second current signal at the master current end and the slave current end according to the driving voltage, respectively; a Zener diode having a negative end coupled to the master current end and a positive end for receiving a constant voltage, the Zener diode receiving the first current signal and controlling a voltage level of the driving voltage to be substantially equal to a predetermined voltage level to regulate the driving voltage; and a biasing unit for receiving the second current signal, judging whether the voltage level of the driving voltage reaches the predetermined voltage level according to the second current signal, and generating a control signal according to the second current signal, wherein the control signal is fed back to the charge pump to control the charge pump to generate the driving voltage.