1. A voltage regulator circuit connected to a voltage booster for generating a high voltage VPP and having an output terminal for delivering a regulated output voltage VPPi, the voltage regulator comprising: first means for receiving the high voltage VPP to produce a sufficiently constant voltage V 1 ; and second means including a driver, which is coupled between the high voltage and the output terminal, wherein the second means clamps the high voltage into the regulated output voltage which is such a voltage (V 1 &plus;Vth) that the sufficiently constant voltage V 1 is summed with a threshold voltage Vth of the driver.