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 Improved Audio Quality Minimum external components Five Logic Selectable Gain Settings (0, 3, 6, 9, 12dB) Low Power Shutdown Mode Click and Pop suppression Available in space-saving microSMD package Description The LM48312 is a single supply, high efficiency, mono, 2.6W, filterless switching audio amplifier. The LM48312 features National’s Enhanced Emissions Suppression (E 2S) system, that features a unique patented 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, and system cost, simplifying design. The LM48312 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 LM48312 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 LM48312 features high efficiency compared to conventional Class AB amplifiers, and other low EMI Class D amplifiers. When driving an 8Ω speaker from a 5V supply, the device operates with 88% efficiency at PO = 1W. The LM48312 features five gain settings, selected through a single logic input, further reducing solution size. 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 84% (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 .027 % PSRR 71 dB SNR 95 dB Channels 1 Channels THD Conditions PO = 200mW, RL = 8Ω, f = 1kHz PSRR Conditions VRIPPLE = 200mVP-P Sine,Inputs AC GND, AV = 0dB, SNR Conditions PO = 1W User Supply 3.6 Volt Shut down Yes Mono/Stereo Mono Shutdown Type High Supply Range +2.5 - +5.5 V Temperature Min -40 deg C Temperature Max 85 deg C Automotive No PowerWise No

Datasheets

Title		Size	Date	Other Language
	LM48312 2.6W, Ultra-Low EMI, Filterless, Mono Class D Audio Power Amplifier with E2S	934 Kbytes	13-May-10

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48312TLE/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 12 weeks	Distributor Region Qty DIGI-KEY Worldwide 750 MOUSER Worldwide 720	$0.60 each at 1K+ pcs	reel of 250
LM48312TLX/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 LM48312.

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 LM48312 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48312TLBD	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
LM48312TLE/NOPB	2.887	MICRO SMD	9	1	260	Detail	N/A	N/A	XVG I N4
LM48312TLX/NOPB	2.887	MICRO SMD	9	1	260	Detail	N/A	N/A	XVG I N4

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 LM48312.

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 LM48312 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM48312TLE	CMOS7	0	21301	0	0	1584000	3	449464325
LM48312TLX	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 LM48312.

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 LM48312 is located at RoHS Status.