LM4953_14 Datasheet, PDF (1/19 Pages) Texas Instruments – Power Amplifier Series Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver

LM4953, LM4953SDBD
www.ti.com
SNAS299E – SEPTEMBER 2005 – REVISED FEBRUARY 2006
LM4953 Boomer™ Audio Power Amplifier Series Ground-Referenced, Ultra Low Noise,
Ceramic Speaker Driver
Check for Samples: LM4953, LM4953SDBD
FEATURES
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•23 Pop & Click Circuitry Eliminates Noise During
Turn-On and Turn-Off Transitions
• Low, 1μA (Max) Shutdown Current
• Low, 7mA (Typ) Quiescent Current
• 12.6Vpp Mono BTL Output, Load = 2μF+ 30Ω
• Thermal Shutdown
• Unity-Gain Stable
• External Gain Configuration Capability
APPLICATIONS
• Cellphone
• PDA
KEY SPECIFICATIONS
• Quiescent Power Supply Current (V_dd = 3V),
7mA(Typ)
• BTL Voltage Swing
(2μF+30Ω load, 1% THD+N, V_dd = 3.6V), 12.6V_pp
(Typ)
• Shutdown Current, 1µA (Max)
DESCRIPTION
The LM4953 is an audio power amplifier designed for
driving Ceramic Speaker in portable applications.
When powered by a 3.6V supply, it is capable of
forcing 12.6Vpp across a 2μF + 30Ω bridge-tied-load
(BTL) with less than 1% THD+N.
Boomer audio power amplifiers were designed
specifically to provide high quality output power with a
minimal amount of external components. The
LM4953 does not require bootstrap capacitors, or
snubber circuits. Therefore it is ideally suited for
display applications requiring high power and minimal
size.
The LM4953 features a low-power consumption
shutdown mode. Additionally, the LM4953 features an
internal thermal shutdown protection mechanism.
The LM4953 contains advanced pop & click circuitry
that eliminates noises which would otherwise occur
during turn-on and turn-off transitions.
The LM4953 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.
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