LM4668

10W High-Efficiency Mono BTL Audio Power Amplifier

General Description

The LM4668 is a high efficiency switching audio power

amplifier primarily designed for demanding applications in

flat panel monitors and TV’s. It is capable of delivering 6W to

an 8

Ω mono BTL load with less than 1% distortion (THD+N)

from a 12V

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4668 features a micro-power,

active-low shutdown mode, an internal thermal shutdown

protection mechanism, and short circuit protection.

The LM4668 contains advanced transient (“pop and click”)

suppression circuitry that eliminates noises that would oth-

erwise occur during turn-on and turn-off transitions.

Key Specifications

f

Ω)

10W (typ)

30mA (typ)

R

Ω,P

79% (typ)

0.15mA (typ)

30dB (typ)

Features

n

Soft-start circuitry eliminates noise during turn-on

transition

n

Low current shutdown mode

n

Low quiescent current

n

6W BTL output, R

Ω

n

Short circuit protection

n

Fixed, internally set gain of 30dB

Applications

n

Flat Panel Monitors

n

Flat Panel TVs

n

Computer Sound Cards

Connection Diagrams

LD Package

MH Package

20089102

Top View

Order Number LM4668LD

See NS Package Number LDC14A

200891G3

Top View

Order Number LM4668MH

See NS Package Number MXA20A

October 2004

© 2004 National Semiconductor Corporation

DS200891

www.national.com