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Stereo Analog Subsystem Includes Class G Headphone Amp for Extended Playback

Thu, 03/03/2011 - 9:03am
National Semiconductor recently announced what it asserts is the industry’s first stereo analog subsystem with integrated Class G headphone amplifier and automatic level control (ALC) for smartphones and feature phones.

The PowerWise LM49251’s Class G headphone amp dynamically reduces the supply voltage to lower power consumption and extend audio (MP3, movies, etc.) playback time. The subsystem combines a 1.4-W Class D speaker amplifier, 20-mW Class G headphone amplifier and ALC in a small 2.55 mm x 3.02 mm package

It is believed to offer the lowest power consumption in its class, consuming less than 7 mA of quiescent current at 3.3V for the loudspeaker and headphone. The LM49251’s ALC feature provides designers with a programmable output power limiter for speaker protection and clip level select.

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