lm4879ibp National Semiconductor Corporation, lm4879ibp Datasheet

lm4879ibp

Manufacturer Part Number

lm4879ibp

Description

1.1 Watt Audio Power Amplifier

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM4879IBP.pdf (25 pages)

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LM4879

1.1 Watt Audio Power Amplifier

General Description

The LM4879 is an audio power amplifier primarily designed

for demanding applications in mobile phones and other por-

table communication device applications. It is capable of

delivering 1.1 watt of continuous average power to an 8Ω

BTL load with less than 1% distortion (THD+N) from a 5V

power supply.

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4879 does not require output

coupling capacitors or bootstrap capacitors, and therefore is

ideally suited for lower-power portable applications where

minimal space and power consumption are primary require-

ments.

The LM4879 features a low-power consumption global shut-

down mode, which is achieved by driving the shutdown pin

with logic low. Additionally, the LM4879 features an internal

thermal shutdown protection mechanism.

The LM4879 contains advanced pop & click circuitry which

eliminates noises which would otherwise occur during

turn-on and turn-off transitions.

The LM4879 is unity-gain stable and can be configured by

external gain-setting resistors.

Typical Application

Boomer

is a registered trademark of National Semiconductor Corporation.

FIGURE 1. Typical Audio Amplifier Application Circuit

DS200243

Key Specifications

Features

n No output coupling capacitors, snubber networks or

n Unity gain stable

n Ultra low current shutdown mode

n Fast turn on: 80ms (typ), 110ms (max) with 1.0µF

n BTL output can drive capacitive loads up to 100pF

n Advanced pop & click circuitry eliminates noises during

n 2.2V - 5.0V operation

n Available in space-saving µSMD, LLP, and MSOP

Applications

n Mobile Phones

n PDAs

n Portable electronic devices

bootstrap capacitors required

capacitor

turn-on and turn-off transitions

packages

PSRR: 5V, 3V

Power Output at 5V & 1% THD+N

Power Output at 3V & 1% THD+N

Shutdown Current

217Hz

20024301

October 2004

350mW (typ)

www.national.com

0.1µA (typ)

62dB (typ)

1.1W (typ)

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