Patent attributes
A methodology and apparatus are disclosed for providing standby power during standby mode by applying a low frequency sampling clock signal to first and second comparators which are connected to compare an output voltage generated at an external capacitor to, respectively, a first higher voltage threshold and a second lower voltage threshold, where the first comparator generates an enable signal in response to the output voltage reaching the first higher voltage threshold for use in activating one or more switched regulator circuits to pump up the output voltage at the external capacitor to exceed the first higher voltage threshold, and where the second comparator generates an undervoltage signal in response to the output voltage reaching the second lower voltage threshold for use in reactivating the main regulator to pump up the output voltage at the external capacitor to exceed the first higher voltage threshold.
