Patent ID: 8598854

Claim:
A regulator comprising: a charge pump adapted to provide a first voltage; a master source follower adapted to receive the first voltage at a gate of the master source follower; a source of the master source follower adapted to provide an output voltage for the regulator; the master source follower being configured to operate in a first mode where the output voltage is substantially constant and to operate in a second mode where the output voltage substantially follows a second voltage at a drain of the master source follower; and a feedback circuit configured to receive a feedback voltage from the master source follower and to selectively activate and deactivate the charge pump in response to the feedback voltage; wherein the master source follower is configured to operate in the first mode when the first voltage minus the second voltage is less than a threshold voltage of the master source follower, and to operate in the second mode when the first voltage minus the second voltage is greater than the threshold voltage of the master source follower.