Features 1.1W (typ) output power with 8 mono BTL load 115mW (typ) output power with stereo 32 BTL loads SPI programmable 32 step digital volume control Eight distinct output modes micro-SMD and LLP surface mount packaging "Click and Pop" suppression circuitry Thermal shutdown protection Low shutdown current (0.1uA, typ) Description The LM4855 is an audio power amplifier system capable of delivering 1.1W (typ) of continuous average power into a mono 8 bridged-tied load (BTL) with 1% THD+N and 115mW (typ) per channel of continuous average power into stereo 32 BTL loads with 0.5% THD+N, using a 5V power supply. The LM4855 features a 32 step digital volume control and eight distinct output modes. The digital volume control and output modes are programmed through a three-wire SPI serial control interface, that allows flexibility in routing and mixing audio channels. The LM4855 is designed for cellular phone, PDA, and other portable handheld applications. It delivers high quality output power from a surface-mount package and requires only six external components. The industry leading micro SMD package only utilizes 2mm x 2.3mm of PCB space, making the LM4855 the most space efficient audio sub system available today. Key Specification THD+N at 1kHz, 1.1W into 8 BTL 1.0% (typ) THD+N at 1kHz, 115mW into 32 BTL 0.5% (typ) Single Supply Operation 2.6 to 5.0V Applications Moblie Phones PDAs

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

Datasheets

Title		Size	Date	Other Language
	LM4855 Integrated Audio Amplifier System	1116 Kbytes	13-Nov-02

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4855ITL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 14 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.40 each at 1K+ pcs	reel of 250
LM4855LQ/NOPB LM4855LQ RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.50 each at 1K+ pcs	reel of 1000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4855IBL	NONE	NATIONAL SEMICONDUCTOR	05 Mar 2008
LM4855IBLX	NONE	NATIONAL SEMICONDUCTOR	05 Mar 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 LM4855.

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 LM4855 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
LM4855ITL/NOPB	5.708	MICRO SMD	18	1	260	Detail	Download	N/A	XYVG I A9
LM4855LQ/NOPB LM4855LQ	46.834 47.008	LLP	24	3 1	260 235	Detail	Download	N/A	NS UZXYTT L4855LQ

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 LM4855.

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 LM4855 is located at RoHS Status.

Design Tools

Title	Size	Date
Audio Amplifier Digital Control Interface Evaluation Board Software

CAD Symbols and Models Download LM4855 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4855ITL	CS065	2	47473	43	0	5527000	1	1568301341
LM4855LQ	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 LM4855.

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 LM4855 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4855IBL	NONE	NATIONAL SEMICONDUCTOR	05 Mar 2008
LM4855IBLX	NONE	NATIONAL SEMICONDUCTOR	05 Mar 2008