Features Fully differential amplification Available in space-saving packages micro SMD, MSOP, and LLP Ultra low current shutdown mode Can drive capacitive loads up to 500pF Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions 2.2 - 5.5V operation No output coupling capacitors, snubber networks or bootstrap capacitors required Unity-gain stable External gain configuration capability Shutdown high or low selectivity High CMRR Description The LM4894 is a fully differential audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4894 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The LM4894 features a low-power consumption shutdown mode. To facilitate this, Shutdown may be enabled by either logic high or low depending on mode selection. Driving the shutdown mode pin either high or low enables the shutdown select pin to be driven in a likewise manner to enable Shutdown. Additionally, the LM4894 features an internal thermal shutdown protection mechanism. The LM4894 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4894 is unity-gain stable and can be configured by external gain-setting resistors. Key Specification ■  Improved PSRR at 217Hz 80dB(typ) ■   Power Output at 5.0V & 1% THD 1.0W(typ) ■   Power Output at 3.3V & 1% THD 400mW(typ) ■  Shutdown Current 0.1µA(typ) Applications Mobile phones PDAs Portable electronic devices

Also Recommended LM4898▲ Lm4898 Is An Upgraded Part, Lm4894 Is Not Recommended For New Designs LM4923▲ LM4923 Is An Upgraded Part, LM4894 Is Not Reccomended For New Designs

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

Datasheets

Title		Size	Date	Other Language
	LM4894 1 Watt Fully Differential Audio Power Amplifier With Shutdown Select	555 Kbytes	5-Oct-11

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4894MMX/NOPB LM4894MMX RoHS Status	MINI SOIC	Not recommended for new designs (as of 4-Aug-05) Lead Time: 8 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.86 each at 1K+ pcs	reel of 3500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4894IBP	LM4941TM	NATIONAL SEMICONDUCTOR	05 Mar 2008
LM4894IBPX	LM4941TMX	NATIONAL SEMICONDUCTOR	05 Mar 2008
LM4894ITL	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894ITLBD	LM4923LQBD	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894ITLX	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894ITP	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894ITPX	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894LD	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894LDBD	LM4923LQBD	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894LDX	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894MM	LM4923LQ	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 LM4894.

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 LM4894 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
LM4894MMX/NOPB LM4894MMX	29.841 30.002	MINI SOIC	10	1 1	260 260	Detail	Download	N/A	ZXTT G94

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 LM4894.

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 LM4894 is located at RoHS Status.

CAD Symbols and Models Download LM4894 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4894MMX	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 LM4894.

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 LM4894 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4894IBP	LM4941TM	NATIONAL SEMICONDUCTOR	05 Mar 2008
LM4894IBPX	LM4941TMX	NATIONAL SEMICONDUCTOR	05 Mar 2008
LM4894ITL	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894ITLBD	LM4923LQBD	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894ITLX	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894ITP	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894ITPX	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894LD	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894LDBD	LM4923LQBD	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894LDX	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4894MM	LM4923LQ	NATIONAL SEMICONDUCTOR	16 Nov 2008