TPA4861

1-W AUDIO POWER AMPLIFIER

SLOS163B SEPTEMBER 1996 REVISED MARCH 2000

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

1-W BTL Output (5 V, 0.11 % THD+N)

3.3-V and 5-V Operation

No Output Coupling Capacitors Required

Shutdown Control (I

= 0.6

Uncompensated Gains of 2 to 20 (BTL
Mode)

Surface-Mount Packaging

Thermal and Short-Circuit Protection

High Supply Ripple Rejection Ratio
(56 dB at 1 kHz)

LM4861 Drop-In Compatible

description

The TPA4861 is a bridge-tied load (BTL) audio power amplifier capable of delivering 1 W of continuous average
power into an 8-

load at 0.2% THD+N from a 5-V power supply in voiceband frequencies (f < 5 kHz). A BTL

configuration eliminates the need for external coupling capacitors on the output in most applications. Gain is
externally configured by means of two resistors and does not require compensation for settings of 2 to 20.
Features of the amplifier are a shutdown function for power-sensitive applications as well as internal thermal
and short-circuit protection. The TPA4861 works seamlessly with TI's TPA4860 in stereo applications. The
amplifier is available in an 8-pin SOIC surface-mount package that reduces board space and facilitates
automated assembly.

Audio

Input

Bias

Control

VDD

1 W

VO1

VO2

VDD

IN +

IN 

BYPASS

SHUTDOWN

VDD/2

GND

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.

2000, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

SHUTDOWN

BYPASS

IN+

GND
V

D PACKAGE

(TOP VIEW)

TPA4861
1-W AUDIO POWER AMPLIFIER

SLOS163B SEPTEMBER 1996 REVISED MARCH 2000

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

AVAILABLE OPTIONS

PACKAGED DEVICE

SMALL OUTLINE

(D)

C to 85

TPA4861D

The D package is available tape and reeled. To order a tape and

reeled part, add the suffix R to the part number (e.g., TPA4861DR).

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

BYPASS

BYPASS is the tap to the voltage divider for internal mid-supply bias. This terminal should be connected
to a 0.1

F 1.0

F capacitor when used as an audio power amplifier.

GND

GND is the ground connection.

IN is the inverting input. IN is typically used as the audio input terminal.

IN+

IN+ is the noninverting input. IN+ is typically tied to the BYPASS terminal.

SHUTDOWN

SHUTDOWN places the entire device in shutdown mode when held high (IDD

0.6

A).

VO1

VO1 is the positive BTL output.

VO2

VO2 is the negative BTL output.

VDD

VDD is the supply voltage terminal.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, V

6 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage, V

0.3 V to V

+0.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation

Internally Limited (see Dissipation Rating Table)

. . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T

C to 85

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating junction temperature range, T

C to 150

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

C to 150

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds

260

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

DISSIPATION RATING TABLE

PACKAGE

DERATING FACTOR

TA = 70

TA = 85

725 mW

5.8 mW/

464 mW

377 mW

recommended operating conditions

MIN

MAX

UNIT

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Supply voltage, VDD

ÁÁÁ

2.7

ÁÁÁ

5.5

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Common mode input voltage VIC

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

VDD = 3 V

ÁÁÁ

1.25

ÁÁÁ

2.7

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Common-mode input voltage, VIC

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

VDD = 5 V

ÁÁÁ

1.25

ÁÁÁ

4.5

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Operating free-air temperature, TA

ÁÁÁ

TPA4861

1-W AUDIO POWER AMPLIFIER

SLOS163B SEPTEMBER 1996 REVISED MARCH 2000

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

electrical characteristics at specified free-air temperature, V

= 3.3 V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

TPA4861

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ÁÁÁ

VOO

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Output offset voltage

ÁÁÁÁÁÁ

See Note 1

ÁÁÁ

PSRR

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Power supply rejection ratio (

VDD /

VOO)

ÁÁÁÁÁÁ

VDD = 3.2 V to 3.4 V

ÁÁÁ

IDD

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Supply current

ÁÁÁÁÁÁ

ÁÁÁ

2.5

ÁÁÁ

IDD(SD)

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Supply current, shutdown

ÁÁÁÁÁÁ

ÁÁÁ

0.6

ÁÁÁ

NOTE 1: At 3 V < VDD < 5 V the dc output voltage is approximately VDD/2.

operating characteristics, V

= 3.3 V, T

= 25

C, R

= 8

PARAMETER

TEST CONDITIONS

TPA4861

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Output power see Note 2

ÁÁÁÁÁÁÁÁ

THD = 0.2%, f = 1 kHz,

ÁÁÁÁ

AV = 2 V/V

ÁÁÁ

400

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Output power, see Note 2

ÁÁÁÁÁÁÁÁ

THD = 2%, f = 1 kHz,

ÁÁÁÁ

AV = 2 V/V

ÁÁÁ

500

ÁÁÁ

BOM

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Maximum output power bandwidth

ÁÁÁÁÁÁÁÁ

Gain = 10 V/V,

ÁÁÁÁ

THD = 2%

ÁÁÁ

kHz

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Unity-gain bandwidth

ÁÁÁÁÁÁÁÁÁÁÁ

Open Loop

ÁÁÁ

1.5

ÁÁÁ

MHz

ÁÁÁ

ÁÁÁÁÁÁÁÁÁ

Supply ripple rejection ratio

ÁÁÁÁÁ

BTL

ÁÁÁÁÁÁÁÁ

f = 1 kHz,

ÁÁÁÁ

CB = 0.1

ÁÁÁ

ÁÁÁÁÁÁÁÁÁ

Supply ripple rejection ratio

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁ

f = 1 kHz,

ÁÁÁÁ

CB = 0.1

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Noise output voltage, see Note 3

ÁÁÁÁÁÁÁÁÁÁÁ

Gain = 2 V/V

ÁÁÁ

NOTES:

2. Output power is measured at the output terminals of the device.
3. Noise voltage is measured in a bandwidth of 20 Hz to 20 kHz.

electrical characteristics at specified free-air temperature range, V

= 5 V (unless otherwise

noted)

PARAMETER

TEST CONDITION

TPA4861

UNIT

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

ÁÁÁ

VOO

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Output offset voltage

ÁÁÁÁÁÁ

See Note 1

ÁÁÁ

PSRR

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Power supply rejection ratio (

VDD /

VOO)

ÁÁÁÁÁÁ

VDD = 4.9 V to 5.1 V

ÁÁÁ

IDD

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Supply current

ÁÁÁÁÁÁ

ÁÁÁ

3.5

ÁÁÁ

IDD(SD)

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Supply current, shutdown

ÁÁÁÁÁÁ

ÁÁÁ

0.6

ÁÁÁ

NOTE 1: At 3 V < VDD < 5 V the dc output voltage is approximately VDD/2.

operating characteristic, V

= 5 V, T

= 25

C, R

= 8

PARAMETER

TEST CONDITIONS

TPA4861

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Output power see Note 2

ÁÁÁÁÁÁÁÁ

THD = 0.2%, f = 1 kHz,

ÁÁÁÁ

AV = 2 V/V

ÁÁÁ

1000

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Output power, see Note 2

ÁÁÁÁÁÁÁÁ

THD = 2%, f = 1 kHz,

ÁÁÁÁ

AV = 2 V/V

ÁÁÁ

1100

ÁÁÁ

BOM

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Maximum output power bandwidth

ÁÁÁÁÁÁÁÁ

Gain = 10 V/V,

ÁÁÁÁ

THD = 2%

ÁÁÁ

kHz

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Unity-gain bandwidth

ÁÁÁÁÁÁÁÁÁÁÁ

Open Loop

ÁÁÁ

1.5

ÁÁÁ

MHz

ÁÁÁ

ÁÁÁÁÁÁÁÁÁ

Supply ripple rejection ratio

ÁÁÁÁÁ

BTL

ÁÁÁÁÁÁÁÁ

f = 1 kHz,

ÁÁÁÁ

CB = 0.1

ÁÁÁ

ÁÁÁÁÁÁÁÁÁ

Supply ripple rejection ratio

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁ

f = 1 kHz,

ÁÁÁÁ

CB = 0.1

ÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁ

Noise output voltage, see Note 3

ÁÁÁÁÁÁÁÁÁÁÁ

Gain = 2 V/V

ÁÁÁ

NOTES:

2. Output power is measured at the output terminals of the device.
3. Noise voltage is measured in a bandwidth of 20 Hz to 20 kHz.

TPA4861
1-W AUDIO POWER AMPLIFIER

SLOS163B SEPTEMBER 1996 REVISED MARCH 2000

POST OFFICE BOX 655303

DALLAS, TEXAS 75265

TYPICAL CHARACTERISTICS

Table of Graphs

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁ

FIGURE

ÁÁÁÁ

VOO

ÁÁÁÁÁÁÁÁÁÁÁ

Output offset voltage

ÁÁÁÁÁÁÁÁÁ

Distribution

ÁÁÁÁ

1,2

ÁÁÁÁ

IDD

ÁÁÁÁÁÁÁÁÁÁÁ

Supply current distribution

ÁÁÁÁÁÁÁÁÁ

vs Free-air temperature

ÁÁÁÁ

3,4

ÁÁÁÁ

ÁÁ

ÁÁÁÁ

THD+N

ÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Total harmonic distortion plus noise

ÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

vs Frequency

ÁÁÁÁ

ÁÁ

ÁÁÁÁ

5,6,7,8,9,

10,11,15,

16,17,18

ÁÁÁÁ

ÁÁ

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁ

vs Output power

ÁÁÁÁ

ÁÁ

ÁÁÁÁ

12,13,14,

19,20,21

ÁÁÁÁ

IDD

ÁÁÁÁÁÁÁÁÁÁÁ

Supply current

ÁÁÁÁÁÁÁÁÁ

vs Supply voltage

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Output noise voltage

ÁÁÁÁÁÁÁÁÁ

vs Frequency

ÁÁÁÁ

23,24

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Maximum package power dissipation

ÁÁÁÁÁÁÁÁÁ

vs Free-air temperature

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Power dissipation

ÁÁÁÁÁÁÁÁÁ

vs Output power

ÁÁÁÁ

26,27

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Maximum power output

ÁÁÁÁÁÁÁÁÁ

vs Free-air temperature

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Output power

ÁÁÁÁÁÁÁÁÁ

vs Load resistance

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Output power

ÁÁÁÁÁÁÁÁÁ

vs Supply voltage

ÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁ

Open-loop gain

ÁÁÁÁÁÁÁÁÁ

vs Frequency

ÁÁÁÁ

kSVR

ÁÁÁÁÁÁÁÁÁÁÁ

Supply ripple rejection ratio

ÁÁÁÁÁÁÁÁÁ

vs Frequency

ÁÁÁÁ

32,33

Part Number TPA4861