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MUA08A

更新时间： 2022-11-26 01:38:48

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
19页	774K
描述
265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mode

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MUA08A 数据手册

September 2001

LM4900

265mW at 3.3V Supply Audio Power Amplifier with

Shutdown Mode

General Description

The LM4900 is a bridged audio power amplifier capable of

delivering 265mW of continuous average power into an 8Ω

load with 1% THD+N from a 3.3V power supply.

Features

n MSOP, LLP, and SOP packaging

n No output coupling capacitors, bootstrap capacitors, or

snubber circuits are necessary

Boomer^®audio power amplifiers were designed specifically

to provide high quality output power from a low supply volt-

age while requiring a minimal amount of external compo-

nents. Since the LM4900 does not require output coupling

capacitors, bootstrap capacitors or snubber networks, it is

optimally suited for low-power portable applications.

n Thermal shutdown protection circuitry

n Unity-gain stable

n External gain configuration capability

n Latest generation ’click and pop’ suppression circuitry

Applications

n Cellular phones

n PDA’s

The LM4900 features an externally controlled, low power

consumption shutdown mode, and thermal shutdown protec-

tion.

n Any portable audio application

The closed loop response of the unity-gain stable LM4900

can be configured by external gain-setting resistors.

Key Specifications

THD+N at 1kHz for 265mW continuous

average output power into 8Ω,

V_DD= 3.3V

1.0% (max)

THD+N at 1kHz for 675mW continuous

average output power into 8Ω,

V_DD= 5V

1.0% (max)

0.1µA (typ)

Shutdown current

Typical Application

DS200064-1

FIGURE 1. Typical Audio Amplifier Application Circuit

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

DS200064

www.national.com

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