Features • Pop & click circuitry eliminates noise during turn-on and turn-off transitions • Low, 2µA (max) shutdown current • Low, 12mA (typ) quiescent current • 12Vp-p mono BTL output, load = 2µF + 30, VDD = 3V • Short circuit protection • Unity-gain stable • External gain configuration capability Description The LM4802B integrates a Boost Converter with an Audio Power Amplifier to drive Ceramic Speakers in portable applications. When powered by a 3V supply, it is capable of forcing 12Vp-p across a 2µF + 30 bridge-tied-load (BTL) with less than 1% THD+N. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4802B does not require bootstrap capacitors, or snubber circuits. Therefore it is ideally suited for portable applications requiring high output voltage and minimal size. The LM4802B features a low-power consumption shutdown mode. Additionally, the LM4802B features an internal thermal shutdown protection mechanism. The LM4802B contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4802B is unity-gain stable. Its gain is set by external resistors. Key Specification Quiescent Power Supply Current 12mA (typ) BTL Voltage Swing (2µF + 30 load, 1% THD+N, VDD = 3V) 12Vp-p (typ) Shutdown Current 2µA (max) Applications • Cellphone • PDA

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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
	LM4802B Boomer ® Audio Power Amplifier Series Audio Power Amplifier with Boost Converter to Drive Ceramic Speakers	1224 Kbytes	28-Mar-05

Featured Application Notes

Title		Size	Date	Other Language
	AN-1645: Application Note 1645 LM4702 Driving a MOSFET Output Stage	655 Kbytes	24-May-07	中文
	AN-1490: Application Note 1490 LM4702 Power Amplifier	1033 Kbytes	26-May-06	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1645: Application Note 1645 LM4702 Driving a MOSFET Output Stage	655 Kbytes	24-May-07	中文
	AN-1490: Application Note 1490 LM4702 Power Amplifier	1033 Kbytes	26-May-06	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4802BLQ	CS065	2	38968	52	0	4402000	1	1249079519
LM4802BLQX	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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