LM4899

1 Watt Fully Differential Audio Power Amplifier With

Shutdown Select and Fixed 6dB Gain

General Description

The LM4899 is a fully differential audio power amplifier

primarily designed for demanding applications in mobile

phones and other portable communication device applica-

tions. It is capable of delivering 1 watt of continuous average

power to an 8

Ω load with less than 1% distortion (THD+N)

from a 5V

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4899 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 LM4899 features a low-power consumption shutdown

mode. To facilitate this, Shutdown may be enabled by either

logic high or low depending on mode selection. Driving the

shutdown mode pin either high or low enables the shutdown

select pin to be driven in a likewise manner to enable Shut-

down. Additionally, the LM4899 features an internal thermal

shutdown protection mechanism.

The LM4899 contains advanced pop & click circuitry which

virtually eliminates noises which would otherwise occur dur-

ing turn-on and turn-off transitions.

The LM4899 has an internally fixed gain of 6dB.

Key Specifications

83dB

1.0W(typ.)

400mW(typ.)

0.1µA(typ.)

Features

n

Fully differential amplification

n

Internal-gain-setting resistors

n

Available in space-saving packages micro SMD, MSOP

and LLP

n

Ultra low current shutdown mode

n

Can drive capacitive loads up to 500pF

n

Improved pop & click circuitry which virtually eliminates

noises during turn-on and turn-off transitions

n

2.4 - 5.5V operation

n

No output coupling capacitors, snubber networks or

bootstrap capacitors required

n

Shutdown high or low selectivity

Applications

n

Mobile phones

n

PDAs

n

Portable electronic devices

Connection Diagrams

9 Bump micro SMD Package

9 Bump micro SMD Marking

200645A0

Top View

Order Number LM4899ITL, LM4899ITLX

See NS Package Number TLA09AAA

200645C7

X - Date Code

T - Die Run Traceability

G - Boomer Family

C1 - LM4899ITL

July 2003

© 2003 National Semiconductor Corporation

DS200645

www.national.com