LM4879, LM4879MMBD, LM4879SDBD

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SNAS142G – SEPTEMBER 2001 – REVISED MAY 2013

LM4879

1.1 Watt Audio Power Amplifier

Check for Samples: LM4879, LM4879MMBD, LM4879SDBD

1

FEATURES

DESCRIPTION

The LM4879 is an audio power amplifier primarily

23

•

No Output Coupling Capacitors, Snubber

designed

for

demanding

applications

in

mobile

Networks or Bootstrap Capacitors Required

phones and other portable communication device

•

Unity Gain Stable

applications. It is capable of delivering 1.1 watt of

•

Ultra Low Current Shutdown Mode

continuous average power to an 8

Ω BTL load with

•

Fast Turn On: 80ms (typ), 110ms (max) with

supply.

1.0µF Capacitor

Boomer™ audio power amplifiers were designed

•

BTL Output Can Drive Capacitive Loads up to

specifically to provide high quality output power with a

100pF

minimal

amount

of

external

components.

The

•

Advanced Pop and Click Circuitry Eliminates

LM4879 does not require output coupling capacitors

Noises During Turn-On and Turn-Off

or bootstrap capacitors, and therefore is ideally suited

Transitions

for lower-power portable applications where minimal

space

and

power

consumption

are

primary

•

2.2V - 5.0V Operation

requirements.

•

Available in Space-Saving DSBGA, WSON, and

VSSOP Packages

The LM4879 features a low-power consumption

global shutdown mode, which is achieved by driving

the shutdown pin with logic low. Additionally, the

APPLICATIONS

LM4879

features

an

internal

thermal

shutdown

•

Mobile Phones

protection mechanism.

•

PDAs

The LM4879 contains advanced pop and click

•

Portable electronic devices

circuitry

which

eliminates

noises

which

would

otherwise

occur

during

turn-on

and

turn-off

KEY SPECIFICATIONS

transitions.

•

PSRR: 5V, 3V at 217Hz: 62dB (typ)

The

LM4879

is

unity-gain

stable

and

can

be

configured by external gain-setting resistors.

•

Power Output at 5V, 1%THD+N: 1.1W (typ)

•

Power Output at 3V, 1%THD+N: 350mW (typ)

•

Shutdown Current: 0.1µA (typ)

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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

Boomer is a trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2001–2013, 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.