Patent ID: 7714661

Claim:
A charge pump enabled stereo headphone system comprising the following formed on a single integrated circuit: a positive power supply with respect to ground originating external to said single integrated circuit; a charge pump coupled to said positive power supply and operable to provide, internal to said single integrated circuit, a negative power supply with respect to ground substantially equal in magnitude to a quanta of said positive power supply; a first headphone amplifier powered by both said positive power supply and said negative power supply, said first headphone amplifier having a first audio input driven by a first audio signal provided external to said single integrated circuit, and a first audio output suitable for driving a stereo headphone with no output capacitor needed for DC blocking; a second headphone amplifier powered by both said positive power supply and said negative power supply, said second headphone amplifier having a second audio input driven by a second audio signal provided external to said single integrated circuit, and a second audio output suitable for driving said stereo headphone with no output capacitor needed for DC blocking; wherein said first and said second headphone amplifiers operate at 3.3 volts.