Features Stereo speaker amplifier Stereo headphone amplifier Mono earpiece amplifier Mono Line Output for external handsfree carkit Independent Left, Right, and Mono volume controls National 3D enhancement I2C compatible interface Ultra low shutdown current Click and Pop Suppression circuit 16 distinct output modes Thermal Shutdown Protection Available in micro SMD and LLP packages Description The LM4857 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 8 load, a stereo headphone amplifier delivering 33mW per channel into a 32 load, a mono earpiece amplifier delivering 43mW into a 32 load, and a line output for an external powered handsfree speaker. It integrates the audio amplifiers, volume control, mixer, power management control, and National 3D enhancement all into a single package. In addition, the LM4857 routes and mixes the stereo and mono inputs into 16 distinct output modes. The LM4857 is controlled through an I2C compatible interface. Other features include an ultra-low current shutdown mode and thermal shutdown protection. Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external components. The LM4857 is available in a 30-bump ITL package and a 28-lead LLP package. Key Specification POUT, Stereo Loudspeakers, 4, 5V, 1% THD+N (LM4857SP) 1.6W (typ) POUT, Stereo Loudspeakers, 8, 5V, 1% THD+N 1.2W (typ) POUT, Stereo Headphones, 32, 5V, 1% THD+N 75mW (typ) POUT, Mono Earpiece, 32, 5V, 1% THD+N 100mW (typ) POUT, Stereo Loudspeakers, 8, 3.3V, 1% THD+N 495mW (typ) POUT, Stereo Headphones, 32, 3.3V, 1% THD+N 33mW (typ) POUT, Mono Earpiece, 32, 3.3V, 1% THD+N 43mW (typ) Shutdown Current 0.06µA (typ) Applications Cell Phones PDAs Portable Gaming Devices Internet Appliances Portable DVD/CD/AAC/MP3 players

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

Datasheets

Title		Size	Date	Other Language
	LM4857 Stereo 1.2W Audio Sub-system with 3D Enhancement	1814 Kbytes	8-Jun-05

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4857ITL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 496 MOUSER Worldwide 500 RS COMPONENTS Worldwide 248	$1.17 each at 1K+ pcs	reel of 250
LM4857SP/NOPB LM4857SP RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1000	$1.31 each at 1K+ pcs	reel of 1000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4857GRBD	LM4857ITLBD	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4857SPX	LM4857ITLX	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 LM4857.

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 LM4857 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
LM4857ITL/NOPB	9.584	MICRO SMD	30	1	260	Detail	Download	N/A	XVG I C2
LM4857SP/NOPB LM4857SP	51.318 51.605	LLP	28	1 1	260 260	Detail	Download	N/A	NS UZXYTT L4857SP

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 LM4857.

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 LM4857 is located at RoHS Status.

CAD Symbols and Models Download LM4857 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4857ITL	CS065	2	47473	43	0	5527000	1	1568301341
LM4857SP	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 LM4857.

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 LM4857 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4857GRBD	LM4857ITLBD	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4857SPX	LM4857ITLX	NATIONAL SEMICONDUCTOR	16 Nov 2008