LM4907

更新时间： 2024-10-01 23:16:47

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
17页	1060K
描述
1 Watt Audio Power Amplifier

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LM4907 数据手册

April 2005

LM4907

1 Watt Audio Power Amplifier

General Description

Key Specifications

The LM4907 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 Watt of continuous average power to an 8Ω BTL

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

power supply.

Improved PSRR at 217Hz & 1KHz

62dB

Power Output at 5.0V, 1% THD+N, 8Ω

1.0W (typ)

Power Output at 3.0V, 1% THD+N, 8Ω 390mW (typ)

Shutdown Current 0.1µA (typ)

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4907 does not require output

coupling capacitors or bootstrap capacitors, and therefore is

ideally suited for mobile phone and other low voltage appli-

cations where minimal power consumption is a primary re-

quirement.

Features

n Available in space-saving LLP package

n Ultra low current shutdown mode

n BTL output can drive capacitive loads

n Improved pop & click circuitry eliminates noise during

turn-on and turn-off transitions

The LM4907 features a low-power consumption shutdown

mode which is achieved by driving the shutdown pin with

logic low. Additionally, the LM4907 features an internal ther-

mal shutdown protection mechanism.

n 2.2 - 5.5V operation

n No output coupling capacitors, snubber networks or

bootstrap capacitors required

n Unity-gain stable

n External gain configuration capability

The LM4907 contains advanced pop & click circuitry which

eliminates noise which would otherwise occur during turn-on

and turn-off transitions.

Applications

n Mobile Phones

n PDAs

The LM4907 is unity-gain stable and can be configured by

external gain-setting resistors.

n Portable electronic devices

Typical Application

200870D3

FIGURE 1. Typical Audio Amplifier Application Circuit

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

DS200870

www.national.com

12 3 4 5 6 7...17

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