Patent ID: 7751857

Claim:
A voltage supply device, comprising: a voltage divider operable to generate a voltage equal to a predetermined proportion of a voltage at an output terminal of the voltage supply device; a reference generator operable to draw current from a source and generate a substantially stable reference voltage using the current; a comparator operable to compare the voltage generated by the voltage divider with the reference voltage and to adjust the voltage at an output node of the voltage supply device based on a difference between the voltage generated by the voltage divider and the output voltages; a transistor coupled to the source, wherein current drawn from the source flows from a collector of the transistor when the transistor is biased; and a capacitor coupled to the collector of the transistor, wherein a voltage across the capacitor increases while current flows to the capacitor from the collector of the transistor; and wherein the comparator is further operable to bias the transistor when the voltage generated by the voltage divider is less than the reference voltage.