Patent ID: 9287779
Filing Date: 2016-03-15
CPC Classification: H02M

Claim Text:
1. A buck switching regulator circuit comprising: a first switching transistor having an input terminal to receive an input voltage and an output terminal coupled to an output node through an inductor; a ramp generator to produce a ramp signal having a period; and a comparator to receive the ramp signal and an error signal, and in accordance therewith, produce a modulation signal, wherein, in a first mode of operation, the ramp signal increases to intersect the error signal, and in accordance therewith, changes a state of the first switching transistor during each period of the ramp signal, and in a second mode of operation, the error signal increases above a maximum value of the ramp signal, and in accordance therewith, the first switching transistor is turned on for a period of time greater than one or more full periods of the ramp signal, and wherein the first switching transistor remains turned on when the error signal is greater than a maximum value of the ramp signal, wherein a current through the inductor to the output node increases continuously across multiple periods of the ramp signal when the error signal is above the maximum value of the ramp signal.