Features Low external component count Quiet fade-in/out mute mode Low power standby mode Wide supply range: 20V - 60V Description The LM4734 is a three channel audio amplifier capable of typically delivering 20W per channel of continuous average output power into a 4 or 8 load with less than 10% THD+N from 20Hz - 20kHz. The LM4734 has short circuit protection and a thermal shut down feature that is activated when the die temperature exceeds 150°C. The LM4734 also has an under voltage lock out feature for click and pop free power on and off. Each amplifier of the LM4734 has an independent smooth transition fade-in/out mute and a power conserving standby mode. The mute and standby modes can be controlled by external logic. The LM4734 has a wide supply operating supply range from ±10V - ±30V allowing for lower cost unregulated power supplies to be used. The LM4734 can easily be configured for bridge or parallel operation for higher power and bi-amp solutions. Key Specification Output Power/Channel with 10% THD+N, 1kHz into 4 or 8 20W (typ) THD+N at 3x1W into 8, 1kHz 0.03% (typ) Mute Attenuation 110dB (typ) PSRR 64dB (typ) Slew Rate 18V/µs (typ) Applications Audio amplifier for component stereo Audio amplifier for compact stereo Audio amplifier for home theater in a box (HTB) Audio amplifier for high-end and HD TVs

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

Datasheets

Title		Size	Date	Other Language
	LM4734 3 Channel 20W Audio Power Amplifier with Mute and Standby	1388 Kbytes	22-Mar-06

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4734TA	LM1876TF	NATIONAL SEMICONDUCTOR	16 Nov 2008

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 LM4734.

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 LM4734 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4734TABD	3 Channel 20W Audio Power Amplifier with Mute and Standby	Full production	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1	$200.00 each	1
The LM4734 is a three channel audio amplifier capable oftypically delivering 20W per channel of continuous average output power into a 4Ω or 8Ω load with less than 10% THD+N from 20Hz to 20kHz. Features include short circuit protection, thermal shut down and under voltage lock out for click and pop free power on and off. Audio Evaluation Board Documentation

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

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 LM4734.

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 LM4734 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4734TA	LM1876TF	NATIONAL SEMICONDUCTOR	16 Nov 2008