LM4893MA Datasheet

IC型号：
LM4893MA
PDF描述：
National Semiconductor [1.1 Watt Audio Power Amplifier]
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700.35KB
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LM4893 1.1 Watt Audio Power Amplifier

August 2004

LM4893

1.1 Watt Audio Power Amplifier

General Description

The LM4893 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 LM4893 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 LM4893 features a low-power consumption global shut-

down mode, which is achieved by driving the shutdown pin

with logic low. Additionally, the LM4893 features an internal

thermal shutdown protection mechanism.

The LM4893 contains advanced pop & click circuitry which

eliminates noises which would otherwise occur during

turn-on and turn-off transitions.

The LM4893 is unity-gain stable and can be configured by

external gain-setting resistors.

Key Specifications

Improved PSRR at 5V, 3V, & 217Hz

Higher Power Output at 5V & 1% THD

Higher Power Output at 3V & 1% THD

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

Instantaneous turn-on time

BTL output can drive capacitive loads up to 100pF

Advanced pop & click circuitry eliminates noises during

turn-on and turn-off transitions

2.2V - 5.5V operation

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

packages

Applications

Mobile Phones

PDAs

Portable electronic devices

Typical Application

20038001

FIGURE 1. Typical Audio Amplifier Application Circuit

Boomer

庐

is a registered trademark of National Semiconductor Corporation.

漏 2004 National Semiconductor Corporation

DS200380

www.national.com

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