LM4954 Datasheet, PDF (1/23 Pages) National Semiconductor (TI) – HIgh Voltage 3 Watt Audio Power Amplifier

LM4954
www.ti.com
SNAS292B – JUNE 2005 – REVISED APRIL 2013
LM4954 Boomer™ Audio Power Amplifier Series High Voltage 3 Watt Audio Power
Amplifier
Check for Samples: LM4954
FEATURES
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•23 No Output Coupling Capacitors, Snubber
Networks or Bootstrap Capacitors Required
• Unity Gain Stable
• Externally Configurable Gain
• Ultra Low Current Active Low Shutdown Mode
• BTL Output can Drive Capacitive Loads Up to
100pF
• “Click and Pop” Suppression Circuitry
• 2.7V - 9.0V Operation
• Available in Space-Saving DSBGA Package
APPLICATIONS
• Mobile Phones
• PDAs
KEY SPECIFICATIONS
• Wide Power Supply Voltage Range, 2.7 ≤ V_DD ≤
9V
• Output Power: V_DD = 7V, 1% THD+N, 2.4W
(Typ)
• Quiescent Power Supply Current, 3mA (Typ)
• PSRR: V_DD = 5V and 3V at 217Hz, 80dB (Typ)
• Shutdown Power Supply Current, 0.01µA (Typ)
DESCRIPTION
The LM4954 is an audio power amplifier primarily
designed for demanding applications in mobile
phones and other portable communication device
applications. It is capable of delivering 2.4 Watts of
continuous average power to an 8Ω BTL load with
less than 1% THD+N from a 7V_DC power supply.
Boomer audio power amplifiers are designed
specifically to provide high quality output power with a
minimal number of external components. The
LM4954 does not require output coupling capacitors
or bootstrap capacitors, and therefore is ideally suited
for lower-power portable applications where minimal
space and power consumption are primary
requirements.
The LM4954 features a low-power consumption
global shutdown mode which is achieved by driving
the shutdown pin with logic low. Additionally, the
LM4954 features an internal thermal shutdown
protection mechanism.
The LM4954 contains advanced pop & click circuitry
which eliminates noises that would otherwise occur
during turn-on and turn-off transitions.
The LM4954 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 © 2005–2013, Texas Instruments Incorporated