LM4928_14 Datasheet, PDF (1/28 Pages) Texas Instruments – Audio Power Amplifier Series 1.2 Watt Stereo Fully Differential Audio Amplifier with RF Suppression and Shutdown Low

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
FEATURES
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•23 RF Suppression Circuitry
• Fully Differential Amplification
• Available in Space-Saving DSBGA and WSON
Packages
• Ultra Low Current Shutdown Mode
• Can Drive Capacitive Loads up to 100pF
• Improved Pop & Click Circuitry Eliminates
Noises During Turn-On and Turn-Off
Transitions
• 2.4 - 5.5V Operation
• No Output Coupling Capacitors, Snubber
Networks or Bootstrap Capacitors Required
APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronic Devices and Accessories
KEY SPECIFICATIONS
• Improved PSRR at 217Hz, 90dB (Typ)
• Output Power at 5.0V @ 1% THD+N (8Ω),
1.2W (Typ)
• Output Power at 3.0V @ 1% THD+N (8Ω),
400mW (Typ)
• Shutdown Current, 0.1µA (Typ)
DESCRIPTION
The LM4928 is an stereo fully differential stereo audio
power amplifier primarily designed for demanding
applications in mobile phones and other portable
communication devices. It is capable of delivering 1.2
watts of continuous average power to a 8Ω load with
less than 1% distortion (THD+N) from a 5V_DC power
supply.
Boomer audio power amplifiers were designed
specifically to provide high quality output power with a
minimal amount of external components. The
LM4928 does not require output coupling capacitors
or bootstrap capacitors, and therefore is ideally suited
for mobile phone and other low voltage applications
where minimal power consumption is a primary
requirement.
The LM4928 features a low-power consumption
shutdown mode. To facilitate this, shutdown may be
enabled by logic low. Additionally, the LM4928
features an internal thermal shutdown protection
mechanism.
The LM4928 contains advanced pop & click circuitry
which eliminates noises which would otherwise occur
during turn-on and turn-off transitions.
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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.
Boomer is a trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2006, Texas Instruments Incorporated