Patent ID: 8008902
Filing Date: 2011-08-30
Classification: H02M,Y02B

Abstract:
1. A buck switching voltage regulator circuit, comprising: a comparison circuit for providing a first indication when a voltage of an output of the buck switching voltage regulator circuit does not exceed a first threshold magnitude and providing a second indication when the voltage of the output of the buck switching regulator circuit exceeds a second threshold magnitude, wherein the second threshold magnitude is greater than the first threshold magnitude; an inductive storage element; a switching circuit for coupling the inductive storage element between an input of the buck switching voltage regulator circuit and the output of the buck switching voltage regulator circuit in response to the first indication, and coupling the inductive storage element between the output of the buck switching voltage regulator circuit and a return path of the output of the buck switching voltage regulator circuit in response to the second indication; and a control circuit for generating the first threshold magnitude and the second threshold magnitude, such that the first threshold magnitude increases with increases in an output current provided by the output of the buck switching voltage regulator circuit to a load and decreases with decreases in the output current, and wherein the control circuit calculates an indication of the output current and sets the first threshold magnitude in conformity therewith.