lm4890iblx National Semiconductor Corporation, lm4890iblx Datasheet

lm4890iblx

Manufacturer Part Number

lm4890iblx

Description

1 Watt Audio Power Amplifier

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM4890IBLX.pdf (31 pages)

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LM4890

1 Watt Audio Power Amplifier

General Description

The LM4890 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 LM4890 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 LM4890 features a low-power consumption shutdown

mode, which is achieved by driving the shutdown pin with

logic low. Additionally, the LM4890 features an internal ther-

mal shutdown protection mechanism.

The LM4890 contains advanced pop & click circuitry which

eliminates noises which would otherwise occur during

turn-on and turn-off transitions.

The LM4890 is unity-gain stable and can be configured by

external gain-setting resistors.

Connection Diagrams

Boomer

is a registered trademark of National Semiconductor Corporation.

Order Number LM4890IBP, LM4890IBPX

See NS Package Number BPA08DDB

8 Bump micro SMD

Top View

DS200192

20019223

Key Specifications

Features

n Available in space-saving packages: micro SMD, MSOP,

n Ultra low current shutdown mode

n BTL output can drive capacitive loads

n Improved pop & click circuitry eliminates noises during

n 2.2 - 5.5V operation

n No output coupling capacitors, snubber networks or

n Thermal shutdown protection

n Unity-gain stable

n External gain configuration capability

Applications

n Mobile Phones

n PDAs

n Portable electronic devices

SOIC, and LLP

turn-on and turn-off transitions

bootstrap capacitors required

PSRR at 217Hz, V

Power Output at 5.0V & 1% THD

Power Output at 3.3V & 1% THD

Shutdown Current

8 bump micro SMD Marking

T - Die Traceability

G - Boomer Family

E - LM4890IBP

X - Date Code

Top View

= 5V (Fig. 1)

20019270

400mW(typ.)

www.national.com

0.1µA(typ.)

62dB(typ.)

May 2003

1W(typ.)

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