LM4954

更新时间： 2024-09-20 23:16:47

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器功率放大器高压
页数	文件大小	规格书
16页	972K
描述
HIgh Voltage 3 Watt Audio Power Amplifier

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LM4954 数据手册

June 2005

LM4954

High Voltage 3 Watt Audio Power Amplifier

General Description

Key Specifications

The LM4954 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 2.4 Watts of continuous average power to an 8Ω

BTL load with less than 1% THD+N from a 7V_DCpower

supply.

Wide Power Supply

Voltage Range

2.7 ≤ V_DD≤ 9V

2.4W (typ)

Output Power: V_DD= 7V, 1% THD+N

Quiescent power supply current

PSRR: V_DD= 5V and 3V at 217Hz

Shutdown power supply current

3mA (typ)

80dB (typ)

Boomer audio power amplifiers are designed specifically to

provide high quality output power with a minimal number of

external components. The LM4954 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.

0.01µA (typ)

Features

n No output coupling capacitors, snubber networks or

bootstrap capacitors required

n Unity gain stable

n Externally configurable gain

n Ultra low current active low shutdown mode

n BTL output can drive capacitive loads up to 100pF

n “Click and pop” suppression circuitry

n 2.7V - 9.0V operation

The LM4954 features a low-power consumption global shut-

down mode which is achieved by driving the shutdown pin

with logic low. Additionally, the LM4954 features an internal

thermal shutdown protection mechanism.

The LM4954 contains advanced pop & click circuitry which

eliminates noises that would otherwise occur during turn-on

and turn-off transitions.

n Available in space-saving microSMD package

The LM4954 is unity-gain stable and can be configured by

external gain-setting resistors.

Applications

n Mobile Phones

n PDAs

Typical Application

20129111

FIGURE 1. Typical Audio Amplifier Application Circuit

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

DS201291

www.national.com

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