Features • Improved RF suppression, by up to 20dB over previous designs in selected applications • Fully differential amplification • Available in space-saving micro SMD package • Ultra low current shutdown mode • Can drive capacitive loads up to 100pF • Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions • 2.4 - 5.5V operation • No output coupling capacitors, snubber networks or bootstrap capacitors required Description The LM4941 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 1.25 watts of continuous average power to a 8Ω load with less than 1% distortion (THD+N) from a 5VDC power supply. The LM4941 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other small form factor applications where minimal PCB space is a primary requirement. The LM4941 also features proprietary internal circuitry that suppresses the coupling of RF signals into the chip. This is important because certain types of RF signals (such as GSM) can couple into audio amplifiers in such a way that part of the signal is heard through the speaker. The RF suppression circuitry in the LM4941 makes it well-suited for portable applications in which strong RF signals generated by an antenna from or a cellular phone or other portable electronic device may couple audibly into the amplifier. Other features include a low-power consumption shutdown mode, internal thermal shutdown protection, and advanced pop & click circuitry. Key Specification ■  Improved PSRR at 217Hz 95dB (typ) ■  Power Output, VDD = 5.0V,  RL = 8Ω, 1% THD+N 1.25W (typ) ■  Power Output, VDD = 3.0V,  RL = 8Ω, 1% THD+N 430mW (typ) ■  Shutdown Current 0.1µA (typ) Applications • Mobile phones • PDAs • Portable electronic devices

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Datasheet

Title		Size	Date	Other Language
	LM4941  1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown	381 Kbytes	9-Mar-07

Featured Application Notes

Title		Size	Date	Other Language
	AN-1609: Application Note 1609 LM49370 Demonstration Board Guide	4417 Kbytes	9-May-07	中文
	AN-1591: Application Note 1591 The LM49370 PCM/I 2 S Bridge	737 Kbytes	17-Jul-07	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1567: Application Note 1567 LM4949 Demonstration Board	3533 Kbytes	18-Jul-07	中文
	AN-1496: Application Note 1496 Noise, TDMA Noise, and Suppression Techniques	85 Kbytes	28-Apr-08	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4941TM	CMOS7	0	18406	0	0	1089000	4	309006723
LM4941TMX	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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