Features Input mux control and two separate inputs per channel Stereo headphone amplifier mode "Click and pop" suppression circuitry Thermal shutdown protection circuitry PCB area-saving micro SMD and thin micro SMD packages TSSOP and exposed-DAP TSSOP and LLP packages Description The LM4873 is a dual bridge-connected audio power amplifier which, when connected to a 5V supply, will deliver 2.1W to a 4 load or 2.4W to a 3 load with less than 1.0% THD+N. In addition, the headphone input pin allows the amplifiers to operate in single-ended mode when driving stereo headphones. A MUX control pin allows selection between the two stereo sets of amplifier inputs. The MUX control can also be used to select two different closed-loop responses. Boomer audio power amplifiers were designed specifically to provide high quality output power from a surface mount package while requiring few external components. To simplify audio system design, the LM4873 combines dual bridge speaker amplifiers and stereo headphone amplifiers on one chip. The LM4873 features an externally controlled, low-power consumption shutdown mode, a stereo headphone amplifier mode, and thermal shutdown protection. It also utilizes circuitry to reduce "clicks and pops" during device turn-on. Key Specification PO at 1% THD+N   LM4873LQ, 3, 4 loads 2.4W(typ), 2.1W(typ) LM4873MTE-1, 3, 4 loads 2.4W(typ), 2.1W(typ) LM4873IBL, 8 load 1.1W(typ) LM4873MTE, 4 1.9W(typ) LM4873, 8 1.1W(typ) Single-ended mode THD+N at 75mW into 32 0.5%(max) Shutdown current 0.7µA(typ) Supply voltage range 2V to 5.5V Applications Multimedia monitors Portable and desktop computers Portable audio systems

Datasheets

Title		Size	Date	Other Language
	LM4873 Dual 2.1W Audio Amplifier Plus Stereo Headphone Function	963 Kbytes	4-Oct-02	日本語

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4873MTEX/NOPB LM4873MTEX RoHS Status	TSSOP EXP PAD	Full production Lead Time: 8 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.40 each at 1K+ pcs	reel of 2500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4873IBLX	LM4857ITLX	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4873LQBD	LM4990ITLBD	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4873MT	LM4873MTEX	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4873MTE	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM4873MTE-1	LM4873MTE	NATIONAL SEMICONDUCTOR	06 Mar 2007
LM4873MTEX-1	LM4873MTEX	NATIONAL SEMICONDUCTOR	06 Mar 2007
LM4873MTX	LM4873MTEX	NATIONAL SEMICONDUCTOR	16 Nov 2008

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 LM4873.

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 LM4873 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM4873MTEX/NOPB LM4873MTEX	73.061 73.592	TSSOP EXP PAD	20	1 1	260 260	Detail	Download	N/A	NSUZXYTT LM4873 MTE

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 LM4873.

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 LM4873 is located at RoHS Status.

CAD Symbols and Models Download LM4873 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4873MTEX	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 LM4873.

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 LM4873 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4873IBLX	LM4857ITLX	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4873LQBD	LM4990ITLBD	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4873MT	LM4873MTEX	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4873MTE	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM4873MTE-1	LM4873MTE	NATIONAL SEMICONDUCTOR	06 Mar 2007
LM4873MTEX-1	LM4873MTEX	NATIONAL SEMICONDUCTOR	06 Mar 2007
LM4873MTX	LM4873MTEX	NATIONAL SEMICONDUCTOR	16 Nov 2008