LM4928

www.ti.com

SNAS330D – DECEMBER 2005 – REVISED FEBRUARY 2006

LM4928 Boomer™ Audio Power Amplifier Series 1.2 Watt Stereo Fully Differential Audio

Amplifier with RF Suppression and Shutdown Low

Check for Samples: LM4928

1

FEATURES

DESCRIPTION

The LM4928 is an stereo fully differential stereo audio

23

•

RF Suppression Circuitry

power amplifier primarily designed for demanding

•

Fully Differential Amplification

applications in mobile phones and other portable

•

Available in Space-Saving DSBGA and WSON

communication devices. It is capable of delivering 1.2

Packages

watts of continuous average power to a 8

Ω load with

•

Ultra Low Current Shutdown Mode

supply.

•

Can Drive Capacitive Loads up to 100pF

Boomer

audio

power

amplifiers

were

designed

•

Improved Pop & Click Circuitry Eliminates

specifically to provide high quality output power with a

Noises During Turn-On and Turn-Off

minimal

amount

of

external

components.

The

Transitions

LM4928 does not require output coupling capacitors

•

2.4 - 5.5V Operation

or bootstrap capacitors, and therefore is ideally suited

for mobile phone and other low voltage applications

•

No Output Coupling Capacitors, Snubber

where minimal power consumption is a primary

Networks or Bootstrap Capacitors Required

requirement.

APPLICATIONS

The LM4928 features a low-power consumption

shutdown mode. To facilitate this, shutdown may be

•

Mobile Phones

enabled by logic low. Additionally, the LM4928

•

PDAs

features an internal thermal shutdown protection

•

Portable Electronic Devices and Accessories

mechanism.

The LM4928 contains advanced pop & click circuitry

KEY SPECIFICATIONS

which eliminates noises which would otherwise occur

during turn-on and turn-off transitions.

•

Improved PSRR at 217Hz, 90dB (Typ)

•

Output Power at 5.0V @ 1% THD+N (8

Ω),

1.2W (Typ)

•

Output Power at 3.0V @ 1% THD+N (8

Ω),

400mW (Typ)

•

Shutdown Current, 0.1µA (Typ)

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

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 © 2005–2006, 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.