LM4904 National Semiconductor, LM4904 Datasheet

LM4904

Manufacturer Part Number

LM4904

Description

1 Watt Audio Power Amplifier

Manufacturer

National Semiconductor

Datasheet

1.LM4904.pdf (18 pages)

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LM4904

1 Watt Audio Power Amplifier

General Description

The LM4904 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

power supply.

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4904 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.

The LM4904 features a low-power consumption shutdown

mode, which is achieved by driving the shutdown pin with

logic high. Additionally, the LM4904 features an internal ther-

mal shutdown protection mechanism.

The LM4904 contains advanced pop & click circuitry which

eliminates noise which would otherwise occur during turn-on

and turn-off transitions.

The LM4904 is unity-gain stable and can be configured by

external gain-setting resistors.

Typical Application

Boomer

is a registered trademark of National Semiconductor Corporation.

FIGURE 1. Typical Audio Amplifier Application Circuit

DS200437

Key Specifications

Features

n Available in space-saving micro SMD package

n Ultra low current shutdown mode

n BTL output can drive capacitive loads

n Improved pop & click circuitry eliminates noise during

n 2.0 - 5.5V operation

n No output coupling capacitors, snubber networks or

n Unity-gain stable

n External gain configuration capability

Applications

n Mobile Phones

n PDAs

n Portable electronic devices

turn-on and turn-off transitions

bootstrap capacitors required

Improved PSRR at 217Hz & 1KHz

Power Output at 5.0V, 1% THD, 8Ω

Power Output at 3.0V, 1% THD, 4Ω

Power Output at 3.0V, 1% THD, 8Ω

Shutdown Current

200437B6

525mW (typ)

390mW (typ)

www.national.com

1.07W (typ)

0.1µA (typ)

May 2004

62dB

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