LM4927_14 Datasheet, PDF (1/20 Pages) Texas Instruments – Audio Power Amplifier Series 2.5 Watt Fully Differential Audio Power Amplifier With Shutdown

LM4927
www.ti.com
SNAS318A – JUNE 2005 – REVISED APRIL 2006
LM4927 Boomer™ Audio Power Amplifier Series 2.5 Watt Fully Differential Audio Power
Amplifier With Shutdown
Check for Samples: LM4927
FEATURES
1
•23 Fully Differential Amplification
• Available in Space-Saving Micro-Array WSON
Package
• 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
KEY SPECIFICATIONS
• Improved PSRR at 217Hz, 85dB (Typ)
• Power Output at 5.0V @ 10% THD (4Ω), 2.5W
(Typ)
• Power Output at 3.3V @ 1% THD, 550mW (Typ)
• Shutdown Current, 0.1µA (Typ)
DESCRIPTION
The LM4927 is a fully differential audio power
amplifier primarily designed for demanding
applications in mobile phones and other portable
communication device applications. It is capable of
delivering 2.5 watts of continuous average power to a
4Ω load with less than 10% 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
LM4927 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 LM4927 features a low-power consumption
shutdown mode. To facilitate this, Shutdown may be
enabled by logic low. Additionally, the LM4927
features an internal thermal shutdown protection
mechanism.
The LM4927 contains advanced pop & click circuitry
which eliminates noises which would otherwise occur
during turn-on and turn-off transitions.
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.
Boomer is a trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
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