TPA6047A4 Datasheet, PDF (1/27 Pages) Texas Instruments – 2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPatTM STEREO HEADPHONE DRIVE AND REGULATOR

TPA6047A4
www.ti.com.............................................................................................................................................................................................. SLOS601 – OCTOBER 2008
2-W STEREO AUDIO POWER AMPLIFIER
WITH DirectPath™ STEREO HEADPHONE DRIVE AND REGULATOR
FEATURES
1
•23 Microsoft™ Windows Vista™ Compliant
• Fully Differential Architecture and High PSRR
Provide Excellent RF Rectification Immunity
• 2.1-W, 1% THD+N Into 4-Ω Speakers and
100-mW, 10% THD+N Into 16-Ω Headphones
From 5-V Supply
• DirectPath™ Headphone Amplifier Eliminates
Output Capacitors ⁽¹⁾
• Internal 4-Step Speaker Gain Control: 10, 12,
15.6, 21.6 dB and Fixed –1.5-V/V Headphone
• 4.75-V Low Dropout Regulator for CODEC
• Independent Shutdown Controls for Speaker,
Headphone Amplifier, and Low Dropout
Regulator (LDO)
• Output Short-Circuit and Thermal Protection
APPLICATIONS
• Notebook Computers
• Portable DVD
SIMPLIFIED APPLICATION CIRCUIT
CODEC
VDD
SPKR
HPR
HPL
SPKL
Shutdown
Control
3 V – 5.5 V
4.5 V – 5.5 V
Regulator Enable
TPA6047A4
SPKR_RIN+
SPKR_RIN–
SPKR_LIN+
SPKR_LIN–
ROUT+
ROUT–
LOUT+
LOUT–
SPVDD
BYPASS
SPGND
HP_EN
SPKR_EN
HP_INR
SGND
HP_INL
HPVDD
CPVDD
VDD
GAIN0
GAIN1
OUTL
OUTR
HPVSS
CPVSS
CPGND
C1P
REG_EN
C1N
REG_OUT
4.75 V (To CODEC)
(1) US Patent Number 5289137
4.5 V – 5.5 V
Gain
Control
DESCRIPTION
The TPA6047A4 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 100 mW
at 10% 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.
Independent shutdown control and dedicated inputs
for the speaker and headphone allow the TPA6047A4
to simultaneously drive both headphones and internal
speakers. Differential inputs to the speaker amplifiers
offer superior power-supply and common-mode noise
rejection.
Speaker
Enable
LDO (V)
Gain (dB)
TPA6040A4
Active Low
4.75
6, 10, 15.6,
21.6
TPA6041A4
Active Low
3.3
10, 12, 15.6,
21.6
TPA6047A4
Active High
4.75
10, 12, 15.6,
21.6
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.
DirectPath, PowerPAD are trademarks of Texas Instruments.
2
Microsoft, Windows Vista are trademarks of Microsoft Corporation.
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 © 2008, Texas Instruments Incorporated