Features
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Stereo speaker amplifier
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Stereo OCL headphone amplifier
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Independent Left, Right, and Mono volume controls
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National 3D enhancement
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I
2C compatible interface
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Ultra low shutdown current
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Click and Pop Suppression circuit
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10 distinct output modes
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Description The LM4844 is an integrated audio sub-system designed for stereo cell phone applications. Operating on a 3.3V supply, it combines
a stereo speaker amplifier delivering 495mW per channel into an 8Ω load and a stereo OCL headphone amplifier delivering 33mW
per channel into a 32Ω load.
It integrates the audio amplifiers, volume control, mixer, power management control, and National 3D enhancement all into
a single package. In addition, the LM4844 routes and mixes the stereo and mono inputs into 10 distinct output modes. The
LM4844 is controlled through an I
2C compatible interface.
Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external
components.
The LM4844 is available in a very small 2.5mm x 2.9mm 30-bump micro SMD (TL) package.
Key Specification
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POUT, Stereo BTL, 8Ω, 3.3V,
1% THD+N
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495mW (typ)
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POUT HP, 32Ω, 3.3V,
1% THD+N
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33mW (typ)
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Shutdown Current, 3.3V
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0.1μA (typ)
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Applications
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Cell Phones
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PDAs
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Portable Gaming Devices
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Internet Appliances
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Portable DVD, CD, AAC, and MP3 Players
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