Patent ID: 6577110
Filing Date: 2003-06-10
Classification: H02M,Y02B

Abstract:
A circuit for generating a regulated output voltage comprising:an inductor having a first terminal and a second terminal; a first switch having a first terminal adapted to receive a first reference voltage, a second terminal in electrical communication with said first terminal of said inductor, and a control terminal for receiving a first pulse frequency modulated (PFM) control signal; a pulse generator having an output terminal in electrical communication with said control terminal of said first switch and an input terminal, said pulse generator providing said first PFM control signal at said output terminal, said first PFM control signal utilizing pulses having a logical HIGH value for a predetermined duration and separated by a logical LOW value of varying duration; and a rectifier circuit having a first control input terminal in electrical communication with said output terminal of said pulse generator, a second control input terminal in electrical communication with said second terminal of said first switch, and a third control input terminal adapted to receive a second reference voltage, said rectifier circuit applying said second reference voltage to said first inductor terminal in response to said first PFM control signal and a voltage difference between said second and third control input terminals of said rectifier circuit.