Features • Available in space-saving LLP package • Ultra low current shutdown mode • BTL output can drive capacitive loads • 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 • Unity-gain stable • External gain configuration capability Description The LM4992 is a stereo audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt, per channel, of continuous average power to an 8 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 LM4992 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 LM4992 features independent shutdown control for each channel and a low-power consumption shutdown mode, which is achieved by driving both shutdown pins with logic low. Additionally, the LM4992 features an internal thermal shutdown protection mechanism. The LM4992 contains advanced pop & click circuitry which eliminates noise which would otherwise occur during turn-on and turn-off transitions. The LM4992 is unity-gain stable and can be configured by external gain-setting resistors. Key Specification Improved PSRR at 217Hz & 1KHz 64dB (1KHz) Stereo Output Power at 5.0V, 1% THD, 8 1.07W (typ) Stereo Output Power at 3.3V, 1% THD, 8 420mW (typ) Shutdown Current, Vdd = 3.3V 0.2µA (typ) Applications • Mobile Phones • PDAs • Portable electronic devices

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

Title		Size	Date	Other Language
	LM4992 Boomer ® Audio Power Amplifier Series 420mW Stereo Cell Phone Audio Amplifier	576 Kbytes	20-Feb-04

Featured Application Notes

Title		Size	Date	Other Language
	AN-1452: Application Note 1452 LM4985 Evaluation Board User's Guide	1190 Kbytes	26-May-06

More Application Notes

Title		Size	Date	Other Language
	AN-1452: Application Note 1452 LM4985 Evaluation Board User's Guide	1190 Kbytes	26-May-06

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4992SD	CMOS7	0	18406	0	0	1089000	4	309006723
LM4992SDX	CMOS7	0	18406	0	0	1089000	4	309006723

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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