Patent ID: 7834601

Claim:
A regulator circuit for generating an output voltage from an input voltage, the regulator circuit comprising: a pulse width modulation circuit for generating a first pulse signal having a duty cycle that is in accordance with the output voltage; a drive circuit for generating the output voltage from the input voltage in response to the first pulse signal provided from the pulse width modulation circuit; a feed forward circuit for controlling the pulse width modulation circuit to generate the first pulse signal having a duty cycle that maintains the output voltage at a desired level before the pulse width modulation circuit provides the first pulse signal to the drive circuit; and a pulse frequency modulation circuit, connected to the drive circuit, for generating a second pulse signal having a substantially constant duty cycle that is in accordance with the output voltage, wherein the drive circuit generates the output voltage from the input voltage in response to one of the first pulse signal and the second pulse signal, and the pulse width modulation circuit generates the first pulse signal with the feed forward circuit when the pulse frequency modulation circuit is operating.