TEXAS INSTRUMENTS TPA4861 Technical data

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1
2
3
4

8
7
6
5

SHUTDOWN

BYPASS

IN+
IN–

VO2
GND
V

DD

VO1

D PACKAGE

(TOP VIEW)

Audio

Input

Bias

Control

V

DD

1 W

6

5

8

7

VO1

VO2

V

DD

1

2

34IN+

IN–

BYPASS

SHUTDOWN

VDD/2

C

I

R

I

R

F

C

S

C

B

–
+

–
+

GND

TPA4861

SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004

1-W MONO AUDIO POWER AMPLIFIER

FEATURES

• 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

• 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-Ω 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.

DD

= 0.6 µA)

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.

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 © 1996–2004, Texas Instruments Incorporated

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TPA4861

SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004

These devices have limited built-in ESD protection. The leads should be shorted together or the device
placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

AVAILABLE OPTIONS

T

A

–40°C to 85°C TPA4861D

(1) 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

NAME NO.

BYPASS 2 I
GND 7 GND is the ground connection.

IN- 4 I IN- is the inverting input. IN- is typically used as the audio input terminal.
IN+ 3 I IN+ is the noninverting input. IN+ is typically tied to the BYPASS terminal.
SHUTDOWN 1 I SHUTDOWN places the entire device in shutdown mode when held high (I
VO1 5 O VO1 is the positive BTL output.
VO2 8 O VO2 is the negative BTL output.
V

DD

I/O DESCRIPTION

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

0.1-µF – 1.0-µF capacitor when used as an audio power amplifier.

6 V

is the supply voltage terminal.

DD

PACKAGED DEVICE

SMALL OUTLINE

(1)

DD

(D)

~ 0.6 µA).

ABSOLUTE MAXIMUM RATINGS

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

V
V

T
T
T

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings

Supply voltage 6 V

DD

Input voltage –0.3 V to V

I

Continuous total power dissipation Internally Limited (see Dissipation Rating Table)
Operating free-air temperature range –40°C to 85°C

A

Operating junction temperature range –40°C to 150°C

J

Storage temperature range –65°C to 150°C

stg

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C

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.

(1)

UNIT

+0.3 V

DD

DISSIPATION RATING TABLE

PACKAGE TA≤ 25°C DERATING FACTOR TA= 70°C TA= 85°C

D 725 mW 5.8 mW/°C 464 mW 377 mW

RECOMMENDED OPERATING CONDITIONS

MIN MAX UNIT

V

Supply voltage 2.7 5.5 V

DD

V

= 3 V 1.25 2.7 V

V

Common-mode input voltage

IC

T

Operating free-air temperature –40 85 °C

A

DD

V

= 5 V 1.25 4.5 V

DD

2

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SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004

ELECTRICAL CHARACTERISTICS

at specified free-air temperature, V

PARAMETER TEST CONDITIONS UNIT

V
PSRR Power supply rejection ratio (∆VDD/∆V
I

DD

I

DD(SD)

(1) At 3 V < V

Output offset voltage See

OO

Supply current 2.5 mA
Supply current, shutdown 0.6 µA

< 5 V the dc output voltage is approximately VDD/2.

DD

= 3.3 V (unless otherwise noted)

DD

) V

OO

MIN TYP MAX

(1)

= 3.2 V to 3.4 V 75 dB

DD

OPERATING CHARACTERISTICS

V

= 3.3 V, TA= 25°C, RL= 8 Ω

DD

PARAMETER TEST CONDITIONS UNIT

P

Output power

O

B

Maximum output power bandwidth Gain = –10 V/V, THD = 2% 20 kHz

OM

B

Unity-gain bandwidth Open Loop 1.5 MHz

1

Supply ripple rejection ratio

V

Noise output voltage

n

(1)

BTL f = 1 kHz, CB= 0.1 µF 56 dB
SE f = 1 kHz, CB= 0.1 µF 30 dB

(2)

THD = 0.2%, f = 1 kHz, AV= –2 V/V 400 mW
THD = 2%, f = 1 kHz, AV= –2 V/V 500 mW

Gain = –2 V/V 20 µV

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

MIN TYP MAX

TPA4861

TPA4861

20 mV

TPA4861

ELECTRICAL CHARACTERISTICS

at specified free-air temperature range, V

PARAMETER TEST CONDITION UNIT

V
PSRR Power supply rejection ratio (∆VDD/∆V
I

DD

I

DD(SD)

(1) At 3 V < V

Output offset voltage See

OO

Supply current 3.5 mA
Supply current, shutdown 0.6 µA

< 5 V the dc output voltage is approximately VDD/2.

DD

= 5 V (unless otherwise noted)

DD

) V

OO

OPERATING CHARACTERISTICS

V

= 5 V, TA= 25°C, RL= 8 Ω

DD

PARAMETER TEST CONDITIONS UNIT

P

B
B

Output power

O

Maximum output power bandwidth Gain = -10 V/V, THD = 2% 20 kHz

OM

Unity-gain bandwidth Open Loop 1.5 MHz

1

Supply ripple rejection ratio

V

Noise output voltage

n

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

(1)

BTL f = 1 kHz, CB= 0.1 µF 56 dB
SE f = 1 kHz, CB= 0.1 µF 30 dB

(2)

TPA4861

MIN TYP MAX

(1)

= 4.9 V to 5.1 V 70 dB

DD

20 mV

TPA4861

MIN TYP MAX

THD = 0.2%, f = 1 kHz, AV= -2 V/V 1000 mW
THD = 2%, f = 1 kHz, AV= -2 V/V 1100 mW

Gain = -2 V/V 20 µV

3

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Number of Amplifiers

20

10

0

VOO − Output Offset Voltage − mV

25

15

5

−4 −3 −2 −1 0 1 2 3 4 5 6

VDD = 3.3 V

30

Number of Amplifiers

20

10

0

VOO − Output Offset Voltage − mV

25

15

5

VDD = 5 V

−4 −3 −2 −1 0 1 2 3 4 5 6

TPA4861

SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004

V

OO

I

DD

THD+N Total harmonic distortion plus noise

I

DD

V

n

k

SVR

Output offset voltage Distribution 1, 2
Supply current distribution vs Free-air temperature 3, 4

Supply current vs Supply voltage 22
Output noise voltage vs Frequency 23, 24
Maximum package power dissipation vs Free-air temperature 25
Power dissipation vs Output power 26, 27
Maximum output power vs Free-air temperature 28

Output power

Open-loop gain vs Frequency 31
Supply ripple rejection ratio vs Frequency 32, 33

DISTRIBUTION OF TPS4861 DISTRIBUTION OF TPS4861

OUTPUT OFFSET VOLTAGE OUTPUT OFFSET VOLTAGE

TYPICAL CHARACTERISTICS

Table of Graphs

FIGURE

vs Frequency 5, 6, 7, 8, 9, 10,11,15, 16,17,18
vs Output power 12, 13, 14, 19,20,21

vs Load resistance 29
vs Supply voltage 30

4

Figure 1. Figure 2.

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− Supply Current − mA

4

2.5

1.5

0.5

TA − Free-Air Temperature − °C

−40 25

3

2

1

VDD = 5 V

I

DD

3.5

85

5

4.5

Typical

− Supply Current − mA

3.5

2

1

0

TA − Free-Air Temperature − °C

−40 25

2.5

1.5

0.5

VDD = 3.3 V

I

DD

3

85

Typical

20

10

1

0.1

0.01
100 1 k 10 k 20 k

f − Frequency − Hz

VDD = 5 V
PO = 1 W
AV = −2 V/V
RL = 8 Ω

CB = 0.1 µF

CB = 1 µF

THD+N − Total Harmonic Distortion Plus Noise − %

20

10

1

0.1

0.01
100 1 k 10 k 20 k

f − Frequency − Hz

VDD = 5 V
PO = 1 W
AV = −10 V/V
RL = 8 Ω

CB = 0.1 µF

CB = 1 µF

THD+N − Total Harmonic Distortion Plus Noise − %

TPA4861

SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004

SUPPLY CURRENT DISTRIBUTION SUPPLY CURRENT DISTRIBUTION

vs vs

FREE-AIR TEMPERATURE FREE-AIR TEMPERATURE

Figure 3. Figure 4.

TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISE

vs vs

FREQUENCY FREQUENCY

Figure 5. Figure 6.

5

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20

10

1

0.1

0.01
100 1 k 10 k 20 k

f − Frequency − Hz

VDD = 5 V
PO = 1 W
AV = −20 V/V
RL = 8 Ω

CB = 0.1 µF

CB = 1 µF

THD+N − Total Harmonic Distortion Plus Noise − %

20

10

1

0.1

0.01
100 1 k 10 k 20 k

f − Frequency − Hz

VDD = 5 V
PO = 0.5 W
AV = −2 V/V
RL = 8 Ω

CB = 0.1 µF

CB = 1 µF

THD+N − Total Harmonic Distortion Plus Noise − %

20

10

1

0.1

0.01
100 1 k 10 k 20 k

f − Frequency − Hz

VDD = 5 V
PO = 0.5 W
AV = −10 V/V
RL = 8 Ω

CB = 0.1 µF

CB = 1 µF

THD+N − Total Harmonic Distortion Plus Noise − %

20

10

1

0.1

0.01
100 1 k 10 k 20 k

f − Frequency − Hz

THD+N − Total Harmonic Distortion Plus Noise − %

VDD = 5 V
PO = 0.5 W
AV = −20 V/V
RL = 8 Ω

CB = 0.1 µF

CB = 1 µF

TPA4861

SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004

TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISE

vs vs

FREQUENCY FREQUENCY

Figure 7. Figure 8.

TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISE

vs vs

FREQUENCY FREQUENCY

6

Figure 9. Figure 10.

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20

10

1

0.1

0.01
100 1 k 10 k 20 k

f − Frequency − Hz

THD+N − Total Harmonic Distortion Plus Noise − %

VDD = 5 V
AV = −10 V/V
Single Ended

RL = 8 Ω
PO = 250 mW

RL = 32 Ω
PO = 60 mW

0.02

10

1

0.1

0.01

0.1 1

PO − Output Power − W

THD+N − Total Harmonic Distortion Plus Noise − %

VDD = 5 V
AV = −2 V/V
RL = 8 Ω
f = 20 Hz

CB = 0.1 µF

2

CB = 1 µF

0.02

10

1

0.1

0.01

0.1 1

PO − Output Power − W

THD+N − Total Harmonic Distortion Plus Noise − %

VDD = 5 V
AV = −2 V/V
RL = 8 Ω
f = 1 kHz

2

CB = 0.1 µF

CB = 1 µF

0.02

10

1

0.1

0.01

0.1 1

PO − Output Power − W

THD+N − Total Harmonic Distortion Plus Noise − %

VDD = 5 V
AV = −2 V/V
RL = 8 Ω
f = 20 kHz

CB = 0.1 µF

2

CB = 1 µF

TPA4861

SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004

TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISE

vs vs

FREQUENCY OUTPUT POWER

Figure 11. Figure 12.

TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISE

vs vs

OUTPUT POWER OUTPUT POWER

Figure 13. Figure 14.

7

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20

10

1

0.1

0.01
100 1 k 10 k 20 k

f − Frequency − Hz

THD+N − Total Harmonic Distortion Plus Noise − %

VDD = 3.3 V
PO = 350 mW
RL = 8 Ω
AV = −2 V/V

CB = 0.1 µF

CB = 1 µF

20

10

1

0.1

0.01
100 1 k 10 k 20 k

f − Frequency − Hz

THD+N − Total Harmonic Distortion Plus Noise − %

VDD = 3.3 V
PO = 350 mW
RL = 8 Ω
AV = −10 V/V

CB = 1 µF

CB = 0.1 µF

20

10

1

0.1

0.01
100 1 k 10 k 20 k

f − Frequency − Hz

THD+N − Total Harmonic Distortion Plus Noise − %

VDD = 3.3 V
PO = 350 mW
RL = 8 Ω
AV = −20 V/V

CB = 1 µF

CB = 0.1 µF

20

10

1

0.1

0.01
100 1 k 10 k 20 k

f − Frequency − Hz

THD+N − Total Harmonic Distortion Plus Noise − %

VDD = 3.3 V
AV = −10 V/V
Single Ended

RL = 32 Ω
PO = 60 mW

RL = 8 Ω
PO = 250 mW

TPA4861

SLOS163C – SEPTEMBER 1996 – REVISED JUNE 2004

TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISE

vs vs

FREQUENCY FREQUENCY

Figure 15. Figure 16.

TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISE

vs vs

FREQUENCY FREQUENCY

8

Figure 17. Figure 18.