Features 3W Output into 8Ω at 5V with THD+N = 1% Selectable spread spectrum mode reduces EMI 80% Efficiency Independent Regulator and Amplifier Shutdown Controls Dynamically Selectable Regulator Output Voltages Filterless Class D 3.0V – 5.5V operation Low Shutdown Current Click and Pop Suppression Description The LM48511 integrates a boost converter with a high efficiency Class D audio power amplifier to provide 3W continuous power into an 8Ω speaker when operating from a 5V power supply. When operating from a 3V to 4V power supply, the LM48511 can be configured to drive 1 to 2.5W into an 8Ω load with less than 1% distortion (THD+N). The Class D amplifier features a low noise PWM architecture that eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. A selectable spread spectrum modulation scheme suppresses RF emissions, further reducing the need for output filters. The LM48511’s switching regulator is a current-mode boost converter operating at a fixed frequency of 1MHz. Two selectable feedback networks allow the LM48511 regulator to dynamically switch between two different output voltages, improving efficiency by optimizing the amplifier’s supply voltage based on battery voltage and output power requirements. The LM48511 is designed for use in portable devices, such as GPS, mobile phones, and MP3 players. The high, 80% efficiency at 5V, extends battery life when compared to Boosted Class AB amplifiers. Independent regulator and amplifier shutdown controls optimize power savings by disabling the regulator when high output power is not required. The gain of the LM48511 is set by external resistors, which allows independent gain control from multiple sources by summing the signals. Output short circuit and thermal overload protection prevent the device from damage during fault conditions. Superior click and pop suppression eliminates audible transients during power-up and shutdown. Key Specification ■  Quiescent Power Supply Current     VDD = 3V   VDD = 5V 9mA (typ) 13.5mA (typ) ■  PO at VDD = 5V, PV1 = 7.8V   RL = 8Ω, THD+N = 1% 3.0W (typ) ■  PO at VDD = 3V, PV1 = 4.8V   RL = 8Ω, THD+N = 1% 1W (typ) ■  PO at VDD = 5V, PV1 = 7.8V   RL = 4Ω, THD+N = 1% 5.4W (typ) ■  Shutdown Current at VDD = 3V 0.01μA (typ) Applications GPS Portable media Cameras Mobile Phones Handheld games

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

Parameters Values Power@ 4Ohms, 1% THD 5.4 Watt Power@ 8Ohms, 1% THD 3.0 Watt Power@ 4Ohms, 10% THD 6.7 Watt Power@ 8Ohms, 10% THD 3.8 Watt THD .03 % PSRR 88 dB Channels 1 Channels THD Conditions Po=2W, f= 1kHz, RL=8ohm PSRR Conditions 200mVpp, f=1kHz User Supply 5 Volt Shut down Yes Mono/Stereo Mono Shutdown Type Low Supply Range +3.0 - +5.0 Temperature Min -40 deg C Temperature Max 85 deg C

Datasheets

Title		Size	Date	Other Language
	LM48511 3W, Ultra-Low EMI, Filterless, Mono, Class D Audio Power Amplifier with Spread Spectrum	445 Kbytes	25-Feb-08

Application Notes

Title		Size	Date	Other Language
	AN-1922: Application Note 1922 LM48511 Evaluation Board User`s Guide	1611 Kbytes	5-Nov-08
	AN-1737: Application Note 1737 Managing EMI in Class D Audio Applications	183 Kbytes	2-Nov-07	日本語 中文

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48511SQ/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1000 AVNET-EM Worldwide 1000 DIGI-KEY Worldwide 3305 FARNELL Europe and Asia 795 MOUSER Worldwide 1000 NEWARK Americas 822 TAYLOR Americas 1000	$1.50 each at 1K+ pcs	reel of 1000
LM48511SQX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.50 each at 1K+ pcs	reel of 4500

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 LM48511.

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 LM48511 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM48511SQBD/NOPB	The LM48511 integrates a boost converter with a high efficiency	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0	$200.00 each	1
This LM48511SQDB is an evaluation board designed to ease the evaluation and effort during the development of a circuit using the LM48511SQ. It is an easy to use stand-alone board that requires power and GND, an input signal and an output load. Features: 3W Output into 8Ω at 5V with THD+N = 1% Selectable spread spectrum mode reduces EMI 81% Efficiency Independent Regulator and Amplifier Shutdown Controls Dynamically Selectable Regulator Output Voltages Filterless Class D 3.0V - 5.5V operation Low Shutdown Current Click and Pop Suppression Applications: GPS Portable media Cameras Mobile Phones Handheld games Contents: Fully Assembled LM48511SQ Evaluation Board LM48511SQ Demo Board Description and Setup Instructions

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
LM48511SQ/NOPB	52.754	LLP	24	1	260	Detail	Download	N/A	NS UZXYTT 48511SQ
LM48511SQX/NOPB	52.754	LLP	24	1	260	Detail	Download	N/A	NS UZXYTT 48511SQ

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 LM48511.

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 LM48511 is located at RoHS Status.

CAD Symbols and Models Download LM48511 CAD Symbols

Models N/A

Reducing EMI in Class D Audio Applications: The Basics Click image to play video in new window

Reducing EMI in Class D Audio Applications: The Basics Date: 2007-08-17 Length: 00:30:00