Features • Available in space-saving packages: LLP, micro SMD, MSOP, and SOIC • Ultra low current shutdown mode • BTL output can drive capacitive loads up to 500pF • Improved pop & click circuitry eliminates noise during turn-on and turn-off transitions • 2.2 - 5.5V operation • No output coupling capacitors, snubber networks or bootstrap capacitors required • Thermal shutdown protection • Unity-gain stable • External gain configuration capability • Headphone amplifier mode Description The LM4892 is an 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 8 BTL load with less than 1% distortion (THD+N) from a 5VDC power supply. Switching between bridged speaker mode and headphone (single-ended) mode is accomplished using the headphone sense pin. Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external components. The LM4892 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 LM4892 features a low-power consumption shutdown mode, which is achieved by driving the shutdown pin with logic low. Additionally, the LM4892 features an internal thermal shutdown protection mechanism. The LM4892 contains advanced pop & click circuitry which eliminates noise which would otherwise occur during turn-on and turn-off transitions. The LM4892 is unity-gain stable and can be configured by external gain-setting resistors. Key Specification PSRR at 217Hz, VDD = 5V, 8 Load 62dB (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

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

Datasheets

Title		Size	Date	Other Language
	LM4892 Boomer ® Audio Power Amplifier Series 1 Watt Audio Power Amplifier with Headphone Sense	1037 Kbytes	10-Oct-02

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4892M	CS065	2	38968	52	0	4402000	1	1249079519
LM4892MM	CS065	2	38968	52	0	4402000	1	1249079519
LM4892MMX	CS065	2	38968	52	0	4402000	1	1249079519
LM4892MX	CS065	2	38968	52	0	4402000	1	1249079519

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.

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A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4892IBP	NONE	NATIONAL SEMICONDUCTOR	04 May 2006
LM4892ITP	LM4991	National Semiconductor	30 Nov 2009
LM4892ITPX	LM4990ITLX	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM4892M	LM4991	National Semiconductor	30 Nov 2009
LM4892MM	LM4991	National Semiconductor	30 Nov 2009
LM4892MMX	LM4991	National Semiconductor	30 Nov 2009
LM4892MX	LM4991	National Semiconductor	30 Nov 2009