Features Output Short Circuit Protection Thermal Shutdown Stereo filterless Class D operation Selectable OCL/CC Headphone Drivers RF Suppression I 2C Control Interface 32-step digital volume control Independent Speaker and Headphone Gain Settings Minimum external components Click and Pop suppression Micro-power shutdown Available in space-saving 25 bump µSMD package Description The LM4949 is a fully integrated audio subsystem designed for stereo cell phone applications. The LM4949 combines a 2.5W stereo Class D amplifier plus a separate 190mW stereo headphone amplifier, volume control, and input mixer into a single device. The filterless class D amplifiers deliver 1.19W/channel into an 8Ω load with <1% THD+N from a 5V supply. The headphone amplifier features National’s Output Capacitor-less (OCL) architecture that eliminates the output coupling capacitors required by traditional headphone amplifiers. Additionally, the headphone amplifiers can be configured with capacitively coupled (CC)loads, or used to drive an external headphone amplifier. When configured for an external amplifier, the VDD/2 output (VOC) controls the external amplifier’s shutdown input. For improved noise immunity, the LM4949 features fully differential left, right and mono inputs. The three inputs can be mixed/multiplexed to either the speaker or headphone amplifiers. The left and right inputs can be used as separate single-ended inputs, mixing multiple stereo audio sources. The mixer, volume control, and device mode select are controlled through an I 2C compatible interface. Output short circuit and thermal shutdown protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. Key Specification ■  Efficiency VDD = 3.6V, 400mW  into 8Ω 86.5% ■  Efficiency VDD = 5V, 1W into 8Ω 87.4% ■  Quiescent Power Supply Current   @ 3.6V 9.36mA ■  Power Output at VDD = 5V    Speaker:   RL = 4Ω, THD+N ≤ 1%   RL = 8Ω, THD+N ≤ 1%   RL = 4Ω, THD+N ≤ 10% 2W 1.19W 2.5W  Headphone:   RL = 16Ω, THD+N ≤ 1%   RL = 32Ω, THD+N ≤ 1% 153mW 89mW ■  Shutdown Current 0.1μA Applications Mobile phones PDAs Laptops

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance click for larger image

Parameters Values Power @ 5V 8Ohms, 1% THD 1.19 Watt Speaker THD+N 0.02 % HP THD+N 0.01 % Speaker PSRR 73 dB HP PSRR 75 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 2 Digital Audio Ports 0 Loudspeaker Type Class D Loudspeaker Outputs 2 Headphone Type Virtual Ground

Datasheets

Title		Size	Date	Other Language
	LM4949 Stereo Class D Audio Subsystem with OCL Headphone Amplifier	984 Kbytes	13-Mar-07

Application Notes

Title		Size	Date	Other Language
	AN-1567: Application Note 1567 LM4949 Demonstration Board	3533 Kbytes	18-Jul-07	中文

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4949TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 643 MOUSER Worldwide 500 RS COMPONENTS Worldwide 244	$1.12 each at 1K+ pcs	reel of 250
LM4949TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.12 each at 1K+ pcs	reel of 3000

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 LM4949.

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 LM4949 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4949TLEVAL	Stereo Class D Audio Subsystem with OCL Headphone Amplifier	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	$325.00 each	1
The LM4949 is an integrated stereo subsystem with filterless stereo Class D speaker amplifiers and selectable output low noise headphone amplifier in a 25-bump micro SMD package. The LM4949 is designed to meet the demands of mobile phones and other portable communication devices. It is capable of delivering 1.19W of average power into stereo 8 ohm loads and 89 milliwatts of average power to a32 ohm load with less than 1% distortion (THD+N) from a 5V DC power supply. The LM4949TLEVAL is an evaluation board designed to ease evaluation and effort during the development of a circuit using the LM4949TL. The evaluation board comes with an I2C card and cable. It is an easy-to-use stand-alone board that requires power and GND, an I2C control signal, aninput signal and anoutput load. Software for the product can be downloaded from http://audio.national.com Features: Tiny micro SMD Very low iddq (13all outputs on at 5V) High output power (2W into 4ohms at 5V) 73dB PSRR 217Hz for speaker outputs 75dB PSRR 217Hz for headphone outputs 0.02% THD+N at 600mW for speaker outputs 0.02% THD+N at 50mW for OCL headphone outputs Applications: Mobile phones Portable devices, such as PMPs, GPS Contents: Fully Assembled LM4949TL Evaluation Board I2C interface card and cable Instructions for where to locate and download the datasheet Please note: Go to http://audio.national.com for more information on using the LM4949TL evaluation kit. Resources: Eval Board Digital Control Software

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
LM4949TL/NOPB	8.485	MICRO SMD	25	1	260	Detail	Download	N/A	XYTT I GH3
LM4949TLX/NOPB	8.485	MICRO SMD	25	1	260	Detail	Download	N/A	XYTT I GH3

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 LM4949.

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 LM4949 is located at RoHS Status.

Design Tools

Title	Size	Date
Audio Amplifier Digital Control Interface Evaluation Board Software

CAD Symbols and Models Download LM4949 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4949TL	CMOS7	0	21301	0	0	1584000	3	449464325
LM4949TLX	CMOS7	0	21301	0	0	1584000	3	449464325

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 LM4949.

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 LM4949 is located at RoHS Status.