Patent ID: 8299764

Claim:
A controller integrated circuit for a switched mode regulator which converts an input voltage to an output voltage, comprising: a phase pin; a feedback pin; a modulation circuit which is configured to regulate the output voltage using the input voltage and output voltage level information, comprising: an error amplifier circuit coupled to said feedback pin providing an output voltage error indication; and a modulator receiving said output voltage error indication and providing at least one switch control signal for controlling an external switch circuit, comprising: a window circuit which develops first and second offset voltages based on said output voltage error indication; a transconductance circuit which develops a ripple voltage relative to said input voltage and said output voltage level information; a hysteretic comparator circuit which compares said ripple voltage with each of said first and second offset voltages and which provides first and second control signals indicative thereof; and a decoder circuit which receives said first and second control signals and which provides said first and second gate control signals; and a filter having an input coupled to the phase pin and an output providing said output voltage level information which approximates the output voltage based on voltage of said phase pin.