LM4844_07 Datasheet, PDF (1/26 Pages) National Semiconductor (TI) – Stereo 1.2W Audio Sub-System with 3D Enhancement

August 2007
LM4844
Stereo 1.2W Audio Sub-System with 3D Enhancement
General 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 am-
plifier delivering 33mW per channel into a 32Ω load.
It integrates the audio amplifiers, volume control, mixer, pow-
er 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 I²C 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 Specifications
Features
■ ^{Stereo speaker amplifier}
■ ^{Stereo OCL headphone amplifier}
■ ^{Independent Left, Right, and Mono volume controls}
■ ^{National 3D enhancement}
■ ^{I2C compatible interface}
■ ^{Ultra low shutdown current}
■ ^{Click and Pop Suppression circuit}
■ ^{10 distinct output modes}
Applications
■ ^{Cell Phones}
■ ^PDAs
■ ^{Portable Gaming Devices}
■ ^{Internet Appliances}
■ ^{Portable DVD, CD, AAC, and MP3 Players}
■ P_OUT, Stereo BTL, 8Ω, 3.3V,
1% THD+N
■ P_OUT HP, 32Ω, 3.3V,
1% THD+N
■ Shutdown Current, 3.3V
495mW (typ)
33mW (typ)
0.1μA (typ)
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation 201535
www.national.com