Patent ID: 7592793
Filing Date: 2009-09-22
Classification: G05F

Abstract:
1. A voltage regulator comprising: a switch coupled to a voltage source for providing a supply voltage; an input detection circuit coupled to the voltage source to generate a control signal in response to the voltage level of the voltage source; an output detection circuit coupled to the supply voltage to generate a first enable signal and a second enable signal in response to the voltage level of the supply voltage; and a regulator coupled to the supply voltage to generate a regulated output voltage; wherein the control signal is coupled to the switch to turn off the switch once the voltage level of the voltage source is higher than a threshold voltage, the first enable signal is further coupled to the switch to switch off the switch when the voltage level of the supply voltage is higher than an output-over-voltage threshold, the second enable signal is utilized to turn off the regulator once the voltage level of the supply voltage is lower than an output-under-voltage threshold.