LM4879

更新时间： 2024-11-04 04:20:07

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器功率放大器
页数	文件大小	规格书
25页	789K
描述
1.1 Watt Audio Power Amplifier

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LM4879 数据手册

October 2004

LM4879

1.1 Watt Audio Power Amplifier

General Description

Key Specifications

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_DC

power supply.

PSRR: 5V, 3V 217Hz

62dB (typ)

1.1W (typ)

Power Output at 5V & 1% THD+N

Power Output at 3V & 1% THD+N

Shutdown Current

350mW (typ)

0.1µA (typ)

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.

Features

n No output coupling capacitors, snubber networks or

bootstrap capacitors required

n Unity gain stable

n Ultra low current shutdown mode

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

capacitor

n BTL output can drive capacitive loads up to 100pF

n Advanced pop & click circuitry eliminates noises during

turn-on and turn-off transitions

n 2.2V - 5.0V operation

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

packages

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.

Applications

n Mobile Phones

n PDAs

n Portable electronic devices

Typical Application

20024301

FIGURE 1. Typical Audio Amplifier Application Circuit

Boomer^®is a registered trademark of National Semiconductor Corporation.

DS200243

www.national.com

12 3 4 5 6 7...25

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