LM4879SD Datasheet

IC型号：
LM4879SD
PDF描述：
National Semiconductor [1.1 Watt Audio Power Amplifier]
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788.33KB
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NSC

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LM4879 1.1 Watt Audio Power Amplifier

October 2004

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 8鈩?/div>

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.

Key Specifications

PSRR: 5V, 3V

217Hz

Power Output at 5V & 1% THD+N

Power Output at 3V & 1% THD+N

Shutdown Current

62dB (typ)

1.1W (typ)

350mW (typ)

0.1碌A (typ)

Features

No output coupling capacitors, snubber networks or

bootstrap capacitors required

Unity gain stable

Ultra low current shutdown mode

Fast turn on: 80ms (typ), 110ms (max) with 1.0碌F

capacitor

BTL output can drive capacitive loads up to 100pF

Advanced pop & click circuitry eliminates noises during

turn-on and turn-off transitions

2.2V - 5.0V operation

Available in space-saving 碌SMD, LLP, and MSOP

packages

Applications

Mobile Phones

PDAs

Portable electronic devices

Typical Application

20024301

FIGURE 1. Typical Audio Amplifier Application Circuit

Boomer

庐

is a registered trademark of National Semiconductor Corporation.

漏 2004 National Semiconductor Corporation

DS200243

www.national.com

制造商
National Semiconductor (TI)
产品
Class-AB
输出功率
1.1 W x 1 at 8 Ohms
输出类型
1-Channel Mono
THD + 噪声
0.1 %
工作电源电压
3 V, 5 V
最大工作温度
+ 85 C
封装 / 箱体
LLP EP
封装
Reel
音频负载电阻
8 Ohms
输入信号类型
Single
最小工作温度
- 40 C
输出信号类型
Differential
电源类型
Single
Supply Voltage - Max
5.5 V
Supply Voltage - Min
2.2 V

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