Patent ID: 7250746

Claim:
A power supply switching regulator comprising: a common terminal; an input terminal for supplying a direct current input; an output terminal; a recirculation diode having a first terminal connected to the common terminal; an inductor having a first terminal connected to a second terminal of the recirculation diode and a second terminal connected to the output terminal; a capacitor having a first terminal connected to the output terminal and a second terminal connected to the common terminal; a switch connected between the input terminal and the first terminal of the inductor, said switch operable for switching between an ON state in which said direct current input is coupled to said inductor, and an OFF state in which said direct current input is isolated from said inductor; and a controller coupled to said switch and operable for controlling the amount of time said switch is in said ON state and the said OFF state such that the duration of time said switch is in said ON state is inversely proportional to the difference between the voltage at the input terminal and the voltage at the output terminal, and an amplifier having an inverting input coupled to said second terminal of said recirculation diode; a non-inverting input coupled to a first terminal of an offset voltage source; and an output coupled to said recirculation diode and to said controller, said first terminal of said recirculation diode being coupled to a second terminal of said offset voltage source.