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

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

Parameters Values Power@ 8Ohms, 1% THD 1.25 Watt Power@ 8Ohms, 10% THD 1.54 Watt THD 0.04 % PSRR 95 dB SNR 108 dB CMRR 70 dB Channels 1 Channels Supply Range +2.4 - +5.5 V THD Conditions Pout = 700mW, f = 1kHz PSRR Conditions Vripple = 200mVpp, f = 217Hz SNR Conditions Pout = 1W, f=1kHz User Supply 5 Volt Temperature Min -40 deg C Temperature Max 85 deg C Automotive Yes PowerWise Yes

Datasheets

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

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4941SD/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 RS COMPONENTS Worldwide 975	$0.36 each at 1K+ pcs	reel of 1000
LM4941TM/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 12 weeks	Distributor Region Qty AVNET-EM Worldwide 1500 DIGI-KEY Worldwide 0 MOUSER Worldwide 500 RS COMPONENTS Worldwide 250	$0.31 each at 1K+ pcs	reel of 250
LM4941TMX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.31 each at 1K+ pcs	reel of 3000

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 LM4941.

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 LM4941 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4941SDBD/NOPB	LM4941SD Evaluation Board	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0	$150.00 each	1
The LM4941 is a W class AB fully differential audio amplifier in a tiny leadless leadframe package. The LM4941 is designed to meet the demands of portable devices. It is capable of delivering 1.25 Watts of average power to an 8 ohm load with less than 1% distortion (THD+N) from a 5V DC power supply. The LM4941SDBD is an evaluation board designed to ease evaluation and effort during the development of a circuit using the LM4941SD. It is an easy-to-use stand-alone board that requires power and GND, a differential input signal and an output load. Features: Tiny 1.25 x 1.25 mm 0.4mm pitch micro SMD package Very low iddq (1.7mA at 5V) PSRR 95dB at 217Hz CMRR 70dB at 217Hz SNR 108dB THD+N 0.04% (Pout = 700mW) Applications: Mobile phones PDAs Portable electronic devices and accessories Contents: Fully Assembled LM4941SD Evaluation Board Instructions for where to locate and download the datasheet

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4941TMBD	1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown	Full production	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1	$150.00 each	1
The LM4941 is a W class AB fully differential audio amplifier in a tiny 0.4mm pitch micro SMD package. The LM4941 is designed to meet the demands of mobile phones and other portable communication devices. It is capable of delivering 1.25 Watts of average power to an 8 ohm load with less than 1% distortion (THD+N) from a 5V DC power supply. The LM4941TMBD is an evaluation board designed to ease evaluation and effort during the development of a circuit using the LM4941TM. It is an easy-to-use stand-alone board that requires power and GND, a differential input signal and an output load. Features: Tiny 1.25 x 1.25 mm 0.4mm pitch micro SMD package Very low iddq (1.7mA at 5V) PSRR 95dB at 217Hz CMRR 70dB at 217Hz SNR 108dB THD+N 0.04% (Pout = 700mW) Applications: Mobile phones PDAs Portable electronic devices and accessories Contents: Fully Assembled LM4941TM Evaluation Board Instructions for where to locate and download the datasheet ***Please note: application information and board layout can be found in the LM4941TM datasheet

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM4941SD/NOPB	17.85	LLP	8	1	260	Detail	Download	N/A	XYTT 4941
LM4941TM/NOPB	1.997	MICRO SMD	9	1	260	Detail	Download	N/A	XVG I H6
LM4941TMX/NOPB	1.997	MICRO SMD	9	1	260	Detail	Download	N/A	XVG I H6

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 LM4941.

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 LM4941 is located at RoHS Status.

CAD Symbols and Models Download LM4941 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4941SD	CMOS7	0	21301	0	0	1584000	3	449464325
LM4941TM	CMOS7	0	21301	0	0	1584000	3	449464325
LM4941TMX	CMOS7	0	21301	0	0	1584000	3	449464325

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 LM4941.

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 LM4941 is located at RoHS Status.