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 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 ■  POUT, Stereo BTL, 8Ω, 3.3V, 1% THD+N 495mW (typ) ■  POUT HP, 32Ω, 3.3V, 1% THD+N 33mW (typ) ■  Shutdown Current, 3.3V 0.1μA (typ) Applications Cell Phones PDAs Portable Gaming Devices Internet Appliances Portable DVD, CD, AAC, and MP3 Players

	Block Diagram click for larger image
Typical Performance click for larger image

Parameters Values Power @ 5V 8Ohms, 1% THD 1.2 Watt Speaker THD+N 0.05 % HP THD+N 0.05 % Speaker PSRR 71 dB HP PSRR 78 dB Speaker SNR Undefined dB Audio Mux Yes Audio Mode Control I2C Supply Range +2.7 - +5.5 V Temperature Min -40 deg C Temperature Max 85 deg C Mono Analog Inputs 1 Stereo Analog Inputs 1 Digital Audio Ports 0 Additional Audio Features National 3D Loudspeaker Type Class AB Loudspeaker Outputs 2 Headphone Type Virtual Ground AEC Q-100 Automotive Grade Undefined

Datasheets

Title		Size	Date	Other Language
	LM4844 Stereo 1.2W Audio Sub-System with 3D Enhancement	641 Kbytes	24-Aug-07

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4844TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 RS COMPONENTS Worldwide 96	$2.00 each at 1K+ pcs	reel of 250

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4844.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4844 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4844TLEVAL	LM4844TLEVAL Evaluation Board	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	CALL	N/A

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM4844TL/NOPB	9.584	MICRO SMD	30	1	260	Detail	Download	N/A	XYTT I GF3

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4844.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4844 is located at RoHS Status.

Design Tools

Title	Size	Date
Audio Amplifier Digital Control Interface Evaluation Board Software

CAD Symbols and Models Download LM4844 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4844TL	CS065	2	47473	43	0	5527000	1	1568301341

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4844.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4844 is located at RoHS Status.