LM4898, LM4898MMBD

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SNAS216D – MAY 2004 – REVISED MAY 2004

LM4898

1 Watt Fully Differential Audio Power Amplifier

With Shutdown Select

Check for Samples: LM4898, LM4898MMBD

1

FEATURES

DESCRIPTION

The LM4898 is a fully differential audio power

2

•

Fully Differential Amplification

amplifier

primarily

designed

for

demanding

•

Available in Space-Saving Packages DSBGA,

applications in mobile phones and other portable

VSSOP, and WSON

communication device applications. It is capable of

•

Ultra Low Current Shutdown Mode

delivering 1 watt of continuous average power to an

8

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

•

Can Drive Capacitive Loads up to 500pF

•

Improved Pop and Click Circuitry Eliminates

Boomer

audio

power

amplifiers

were

designed

Noises During Turn-On and Turn-Off

specifically to provide high quality output power with a

Transitions

minimal

amount

of

external

components.

The

•

2.4 - 5.5V Operation

LM4898 does not require output coupling capacitors

•

No Output Coupling Capacitors, Snubber

or bootstrap capacitors, and therefore is ideally suited

Networks or Bootstrap Capacitors Required

for mobile phone and other low voltage applications

where minimal power consumption is a primary

•

Shutdown High or Low Selectivity

requirement.

APPLICATIONS

The LM4898 features a low-power consumption

shutdown mode. To facilitate this, Shutdown may be

•

Mobile Phones

enabled by either logic high or low depending on

•

PDAs

mode selection. Driving the shutdown mode pin either

•

Portable Electronic Devices

high or low enables the shutdown select pin to be

driven in a likewise manner to enable Shutdown.

Additionally, the LM4898 features an internal thermal

KEY SPECIFICATIONS

shutdown protection mechanism.

•

Improved PSRR at 217Hz: 83 dB(typ)

The LM4898 contains advanced pop and click

•

Power Output at 5.0V, 1% THD: 1.0 W(typ)

circuitry which virtually eliminates noises which would

•

Power Output at 3.3V, 1% THD: 400 mW(typ)

otherwise

occur

during

turn-on

and

turn-off

•

Shutdown Current: 0.1µA(typ)

transitions.

Connection Diagrams

Top View

Top View

Top View

Figure 1. VSSOP Package

Figure 2. WSON Package

Figure 3. 9 Bump DSBGA

Package

See Package Number DGS0010A

See Package Number NGZ0010B

See Package Number

YZR0009AAA

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.