Features Passes FCC Class B Radiated Emissions with 20 inches of cable E 2S System Reduces EMI while Preserving Audio Quality and Efficiency Output Short Circuit Protection with Auto-Recovery No output filter required Internally Configured Gain (6dB) Low power shutdown mode Minimum external components "Click and pop" suppression Micro-power shutdown Available in space-saving microSMD package Description The LM48311 is a single supply, high efficiency, mono, 2.6W, filterless switching audio amplifier. The LM48311 features National’s Enhanced Emissions Suppression (E 2S) system, that features a unique patent-pending ultra low EMI, spread spectrum, PWM architecture, that significantly reduces RF emissions while preserving audio quality and efficiency. The E 2S system improves battery life, reduces external component count, board area consumption, system cost, and simplifying design. The LM48311 is designed to meet the demands of portable multimedia devices. Operating from a single 5V supply, the device is capable of delivering 2.6W of continuous output power to a 4Ω load with less than 10% THD+N. Flexible power supply requirements allow operation from 2.4V to 5.5V. The LM48311 features both a spread spectrum modulation scheme, and an advanced, patented edge rate control (ERC) architecture that significantly reduces emissions, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency (η = 88%). The LM48311 features high efficiency compared to conventional Class AB amplifiers, and other low EMI Class D amplifiers. When driving and 8Ω speaker from a 5V supply, the device operates with 88% efficiency at PO = 1W. The gain of the LM48311 is internally set to 6dB, further reducing external component count. A low power shutdown mode reduces supply current consumption to 0.01µA. Advanced output short circuit protection with auto-recovery prevents the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. Key Specification ■   Efficiency at 3.6V, 400mW into 8Ω 85% (typ) ■   Efficiency at 5V, 1W into 8Ω 88% (typ) ■  Quiescent Power Supply Current at 5V 3.1mA ■  Power Output at VDD = 5V, RL = 4Ω   THD+N ≤ 10%   THD+N ≤ 1% 2.6W (typ) 2.1W (typ) ■  Power Output at VDD = 5V, RL = 8Ω   THD+N ≤ 10%   THD+N ≤ 1% 1.6W (typ) 1.3W (typ) ■  Shutdown current 0.01μA (typ) Applications Mobile phones PDAs Laptops

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

Parameters Values Power@ 4Ohms, 1% THD 2.1 Watt Power@ 8Ohms, 1% THD 1.3 Watt Power@ 4Ohms, 10% THD 2.6 Watt Power@ 8Ohms, 10% THD 1.6 Watt THD 0.3 % PSRR 76 dB SNR 97 dB Channels 1 Channels THD Conditions PO = 200mW, RL = 8Ω, f = 1kHz PSRR Conditions VRIPPLE = 200mVP-P Sine,Inputs AC GND, CIN = 1μF, fRIPPLE = 1kHz SNR Conditions PO = 1W User Supply 5 Volt Shut down Yes Mono/Stereo Mono Shutdown Type Low Supply Range +2.4 - +5.5 V Temperature Min -40 deg C Temperature Max 85 deg C Automotive No PowerWise Yes

Datasheets

Title		Size	Date	Other Language
	LM48311 Ultra-Low EMI, Filterless, 2.6W, Mono, Class D Audio Power Amplifier with E2S	480 Kbytes	17-Mar-10

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48311TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.60 each at 1K+ pcs	reel of 250
LM48311TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.60 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 LM48311.

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 LM48311 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48311TLBD	evaluation board	Full production	Contact your distributor	CALL	N/A

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
LM48311TL/NOPB	2.887	MICRO SMD	9	1	260	Detail	Download	N/A	XVG I N1
LM48311TLX/NOPB	2.887	MICRO SMD	9	1	260	Detail	Download	N/A	XVG I N1

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 LM48311.

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 LM48311 is located at RoHS Status.

CAD Symbols and Models Download LM48311 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM48311TL	CMOS7	0	21301	0	0	1584000	3	449464325
LM48311TLX	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 LM48311.

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 LM48311 is located at RoHS Status.