TPA6045A4C
www.ti.com.............................................................................................................................................................................................. SLOS614–OCTOBER 2008
2-W STEREO AUDIO POWER AMPLIFIER
WITH DirectPath™ STEREO HEADPHONE DRIVE AND REGULATOR
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FEATURES
DESCRIPTION
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•
Microsoft™ Windows Vista™ Compliant
•
Fully Differential Architecture and High PSRR
Provide Excellent RF Rectification Immunity
The TPA6045A4C is a stereo audio power amplifier
and DirectPath™ headphone amplifier in a thermally
enhanced, space-saving, 32-pin QFN package. The
speaker amplifier is capable of driving 2.1 W per
channel continuously into 4-Ω loads at 5 V. The
headphone amplifier achieves a minimum of 85 mW
at 1% THD+N from a 5-V supply. A built-in internal
4-step gain control for the speaker amplifier and a
fixed –1.5 V/V gain for the headphone amplifier
minimizes external components needed.
•
2.1-W, 1% THD+N Into 4-Ω Speakers and
85-mW, 1% THD+N Into 16-Ω Headphones
From 5-V Supply
•
•
DirectPath™ Headphone Amplifier Eliminates
(1)
Output Capacitors
Internal 4-Step Speaker Gain Control: 10, 12,
15.6, 21.6 dB and Fixed –1.5-V/V Headphone
Independent shutdown control and dedicated inputs
for the speaker and headphone allow the
•
•
3.3-V Low Dropout Regulator for CODEC
Independent Shutdown Controls for Speaker,
Headphone Amplifier, and Low Dropout
Regulator (LDO)
TPA6045A4C
to
simultaneously
drive
both
headphones and internal speakers. Differential inputs
to the speaker amplifiers offer superior power-supply
and common-mode noise rejection.
•
Output Short-Circuit and Thermal Protection
APPLICATIONS
•
Notebook Computers
•
Portable DVD
SIMPLIFIED APPLICATION CIRCUIT
TPA6045A4C
Speaker
LDO (V)
4.75
3.3
Gain (dB)
Enable
CODEC
ROUT+
ROUT–
SPKR_RIN+
SPKR_RIN–
SPKR
HPR
6, 10, 15.6,
21.6
TPA6040A4
TPA6041A4
TPA6043A4
TPA6045A4C
TPA6047A4
Active Low
LOUT+
LOUT–
HPL
10, 12, 15.6,
21.6
SPKR_LIN+
SPKR_LIN–
SPKL
Active Low
Active Low
Active High
Active High
VDD
SPVDD
SPGND
4.5 V – 5.5 V
6, 10, 15.6,
21.6
BYPASS
3.3
GAIN0
GAIN1
Gain
Control
HP_EN
10, 12, 15.6,
21.6
Shutdown
Control
3.3
SPKR_EN
OUTL
OUTR
10, 12, 15.6,
21.6
HP_INR
SGND
4.75
HPVSS
CPVSS
HP_INL
HPVDD
CPVDD
VDD
3 V – 5.5 V
CPGND
C1P
C1N
4.5 V – 5.5 V
Regulator Enable
REG_EN
REG_OUT
3.3 V (To CODEC)
(1) US Patent Number 5289137
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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.
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DirectPath, PowerPAD are trademarks of Texas Instruments.
Microsoft, Windows Vista are trademarks of Microsoft Corporation.
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 © 2008, Texas Instruments Incorporated