Features Pop & click circuitry eliminates noise during turn-on and turn-off transitions Low, 1µA (max) shutdown current Low, 7mA (typ) quiescent current 12.6Vpp mono BTL output, load = 2µF+ 30 Thermal shutdown Unity-gain stable External gain configuration capability Description The LM4953 is an audio power amplifier designed for driving Ceramic Speaker in portable applications. When powered by a 3.6V supply, it is capable of forcing 12.6Vpp across a 2µF + 30 bridge-tied-load (BTL) with less than 1% THD+N. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4953 does not require bootstrap capacitors, or snubber circuits. Therefore it is ideally suited for display applications requiring high power and minimal size. The LM4953 features a low-power consumption shutdown mode. Additionally, the LM4953 features an internal thermal shutdown protection mechanism. The LM4953 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4953 is unity-gain stable and can be configured by external gain-setting resistors. Key Specification Quiescent Power Supply Current (Vdd = 3V) 7mA(typ) BTL Voltage Swing (2µF+30 load, 1% THD+N, Vdd = 3.6V) 12.6Vpp (typ) Shutdown Current 1µA (max) Applications Cellphone PDA

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

Parameters Values Voltage@ Vcc=3V, 1% THD 10.2 Volt Load Conditions 2uF+30ohm Supply Min 1.6 Volt Supply Max 4.2 Volt THD 0.02 % THD Conditions Vout=8.5Vpp at Vcc=3V Shutdown Type Low

Datasheets

Title		Size	Date	Other Language
	LM4953 LM4953 Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver	837 Kbytes	2-Feb-06

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4953SD/NOPB LM4953SD RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.85 each at 1K+ pcs	reel of 1000
LM4953SDX/NOPB LM4953SDX RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.85 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 LM4953.

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 LM4953 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4953SDBD	LM4953 Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	$149.00 each	1
The LM4953 is an audio power amplifier designed for driving Ceramic Speaker in portable applications. When powered by a 3.6V supply, it is capable of forcing 12.6Vpp across a 2µF+ 30??bridge-tied-load (BTL) with less than 1% THD+N. This LM4953SDBD is an evaluation board designed to ease the evaluation and effort during the development of a circuit using the LM4953SD. It is an easy to use stand-alone board that requires power and GND, an input signal and an output load. Features: Pop & click circuitry eliminates noise during turn-on and turn-off transitions Low, 1µA (max) shutdown current Low, 7mA (typ) quiescent current 12.6Vpp mono BTL output, load = 2µF+ 30?? Thermal shutdown Unity-gain stable External gain configuration capability Applications: Mobile Phones PDA's Portable electronic device Applications requiring thin form factors Contents: Fully Assembled LM4953SD Evaluation Board Instructions for where to locate and download the datasheet  Please note: application information and board layout can be found in 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
LM4953SD/NOPB LM4953SD	27.794 27.897	LLP	14	1 1	260 260	Detail	Download	N/A	ZXYTTE# L4953
LM4953SDX/NOPB LM4953SDX	27.794 27.897	LLP	14	1 1	260 260	Detail	Download	N/A	ZXYTTE# L4953

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 LM4953.

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 LM4953 is located at RoHS Status.

CAD Symbols and Models Download LM4953 CAD Symbols

Models N/A