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

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Datasheet

Title		Size	Date	Other Language
	LM48311  Ultra-Low EMI, Filterless, 2.6W, Mono, Class D Audio Power Amplifier with E 2 S	475 Kbytes	25-Jun-09

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)
LM48311TL	CMOS7	0	18406	0	0	1089000	4	309006723
LM48311TLX	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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