1

FEATURES

DESCRIPTION

APPLICATIONS

SIMPLIFIED APPLICATION CIRCUIT

CODEC

VDD

SPKR

SPKR_LIN–

BYPASS

SGND

HP_EN

SPKR_EN

SPKR_RIN–

SPKR_LIN+

HP_INR

HP_INL

HPVDD

CPVDD

VDD

REG_EN

REG_OUT

SPKR_RIN+

ROUT+

LOUT+

ROUT–

LOUT–

SPVDD

CPVSS

C1P

HPVSS

SPGND

CPGND

C1N

GAIN0

GAIN1

OUTL

OUTR

HPR

HPL

SPKL

TPA6045A4C

Shutdown

Control

3V – 5.5V

4.5V – 5.5V

RegulatorEnable

3.3V(ToCODEC)

4.5V – 5.5V

Gain

Control

TPA6045A4C

2-W STEREO AUDIO POWER AMPLIFIER

WITH DirectPath™ STEREO HEADPHONE DRIVE AND REGULATOR

23

• Microsoft™ Windows Vista™ Compliant

• Fully Differential Architecture and High PSRR

The TPA6045A4C is a stereo audio power amplifier

and DirectPath™ headphone amplifier in a thermally

Provide Excellent RF Rectification Immunity

enhanced, space-saving, 32-pin QFN package. The

• 2.1-W, 1% THD+N Into 4-Ω Speakers and

speaker amplifier is capable of driving 2.1 W per

85-mW, 1% THD+N Into 16-

Ω Headphones

channel continuously into 4-

Ω loads at 5 V. The

From 5-V Supply

headphone amplifier achieves a minimum of 85 mW

• DirectPath™ Headphone Amplifier Eliminates

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

• Internal 4-Step Speaker Gain Control: 10, 12,

minimizes external components needed.

15.6, 21.6 dB and Fixed –1.5-V/V Headphone

Independent shutdown control and dedicated inputs

• 3.3-V Low Dropout Regulator for CODEC

for

the

speaker

and

headphone

allow

the

• Independent Shutdown Controls for Speaker,

TPA6045A4C

to

simultaneously

drive

both

Headphone Amplifier, and Low Dropout

headphones and internal speakers. Differential inputs

Regulator (LDO)

to the speaker amplifiers offer superior power-supply

• Output Short-Circuit and Thermal Protection

and common-mode noise rejection.

• Notebook Computers

• Portable DVD

Speaker

LDO (V)

Gain (dB)

Enable

6, 10, 15.6,

TPA6040A4

Active Low

4.75

21.6

10, 12, 15.6,

TPA6041A4

Active Low

3.3

21.6

6, 10, 15.6,

TPA6043A4

Active Low

3.3

21.6

10, 12, 15.6,

TPA6045A4C

Active High

3.3

21.6

10, 12, 15.6,

TPA6047A4

Active High

4.75

21.6

(1)

US Patent Number 5289137

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.

2

DirectPath, PowerPAD are trademarks of Texas Instruments.

3

Microsoft, Windows Vista are trademarks of Microsoft Corporation.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.