lm4889ld National Semiconductor Corporation, lm4889ld Datasheet

lm4889ld

Manufacturer Part Number

lm4889ld

Description

1 Watt Audio Power Amplifier

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM4889LD.pdf (19 pages)

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LM4889

1 Watt Audio Power Amplifier

General Description

The LM4889 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 2% 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 LM4889 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 LM4889 features a low-power consumption shutdown

mode, which is achieved by driving the shutdown pin with a

logic low. Additionally, the LM4889 features an internal ther-

mal shutdown protection mechanism.

The LM4889 contains advanced pop & click circuitry to

eliminate noise which would otherwise occur during turn-on

and turn-off transitions.

The LM4889 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

DS200358

Key Specifications

Features

n Available in space-saving MSOP, SOIC, LLP, and micro

n Ultra low current shutdown mode (3.3 to 2.6V - 0.01µA)

n Can drive capacitive loads up to 500 pF

n Improved pop & click circuitry eliminates noises during

n 2.2 - 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

SMD packages

turn-on and turn-off transitions

bootstrap capacitors required

Improved PSRR at 217Hz, 5 - 3.3V

Power Output at 5.0V & 2% THD

Power Output at 3.3V & 1% THD

Shutdown Current at 3.3 & 2.6V

20035801

400mW(typ.)

www.national.com

0.01µA(typ.)

1.0W(typ.)

June 2003

75dB

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