LM4844 datasheet

Stereo 1.2W Audio Sub-System with 3D Enhancement
LM4844 datasheet
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.


Features


• Stereo speaker amplifier
• Stereo OCL headphone amplifier
• Independent Left, Right, and Mono volume controls
• National 3D enhancement
• I 2C 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

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LM4755 datasheet

Description

The LM4755 is a stereo audio amplifier capable of delivering 11W per channel of continuous average output power to a 4Ω load or 7W per channel into 8Ω using a single 24V supply at 10% THD+N. The internal mute circuit and pre-set gain resistors provide for a very economical design solution.

Output power specifications at both 20V and 24V supplies and low external component count offer high value to consumer electronic manufacturers for stereo TV and compact stereo applications. The LM4755 is specifically designed for single supply operation.
 
Features


• Drives 4Ω and 8Ω loads
• Integrated mute function
• Internal Gain Resistors
• Minimal external components needed
• Single supply operation
• Internal current limiting and thermal protection
• Compact 9-lead TO-220 package
• Wide supply range 9V - 40V
 
 
Key Specification


• Output power at 10% THD with 1kHz into 4Ω at VCC = 24V:  11W (typ)

• Output power at 10% THD with 1kHz into 8Ω at VCC = 24V:  7W (typ)

• Closed loop gain: 34dB (typ)

• PO at 10% THD+N @ 1kHz into 4Ω single-ended TO-263 package at VCC=12V: 2.5W (typ)

• PO at 10% THD+N @ 1kHz into 8Ω bridged TO-263 package at VCC=12V: 5W (typ)
 
Applications


• Stereos TVs
• Compact stereos
• Mini component stereos
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