LM4889 Datasheet, PDF (1/27 Pages) National Semiconductor (TI) – 1 Watt Audio Power Amplifier

LM4889
www.ti.com
SNAS157H – APRIL 2002 – REVISED MAY 2013
LM4889
1 Watt Audio Power Amplifier
Check for Samples: LM4889
FEATURES
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•23 Available in Space-Saving VSSOP, SOIC,
WSON, and DSBGA Packages
• Ultra Low Current Shutdown Mode (3.3 to 2.6V
- 0.01µA)
• Can Drive Capacitive Loads up to 500 pF
• Improved Pop & Click Circuitry Eliminates
Noises During Turn-On and Turn-Off
Transitions
• 2.2 - 5.5V Operation
• No Output Coupling Capacitors, Snubber
Networks or Bootstrap Capacitors Required
• Unity-Gain Stable
• External Gain Configuration Capability
APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronic Devices
KEY SPECIFICATIONS
• Improved PSRR at 217Hz, 5 - 3.3V 75dB
• Power Output at 5.0V & 2% THD 1.0W(typ.)
• Power Output at 3.3V & 1% THD 400mW(typ.)
• Shutdown Current at 3.3 & 2.6V 0.01µA(typ.)
DESCRIPTION
The LM4889 is an audio power amplifier primarily
designed for demanding applications in mobile
phones and other portable communication device
applications. It is capable of delivering 1 watt of
continuous average power to an 8Ω BTL load with
less than 2% 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
LM4889 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 LM4889 features a low-power consumption
shutdown mode, which is achieved by driving the
shutdown pin with a logic low. Additionally, the
LM4889 features an internal thermal shutdown
protection mechanism.
The LM4889 contains advanced pop & click circuitry
to eliminate noise which would otherwise occur during
turn-on and turn-off transitions.
The LM4889 is unity-gain stable and can be
configured by external gain-setting resistors.
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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 © 2002–2013, Texas Instruments Incorporated