Texas Instruments TPA721MSOPEVM, TPA721EVM, TPA721D, TPA721DR, TPA721DGNR Datasheet

TPA721

700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER

SLOS231B – NOVEMBER 1998 – REVISED MARCH 2000

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

Fully Specified for 3.3-V and 5-V Operation

D

Wide Power Supply Compatibility

2.5 V – 5.5 V

D

Output Power for RL = 8 Ω
– 700 mW at VDD = 5 V, BTL
– 250 mW at V

DD

= 3.3 V, BTL

D

Integrated Depop Circuitry

D

Thermal and Short-Circuit Protection

D

Surface-Mount Packaging
– SOIC
– PowerP AD  MSOP

description

The TP A721 is a bridge-tied load (BTL) audio power amplifier developed especially for low-voltage applications
where internal speakers are required. Operating with a 3.3-V supply, the TPA721 can deliver 250-mW of
continuous power into a BTL 8-Ω load at less than 0.6% THD+N throughout voice band frequencies. Although
this device is characterized out to 20 kHz, its operation was optimized for narrower band applications such as
wireless communications. The BTL configuration eliminates the need for external coupling capacitors on the
output in most applications, which is particularly important for small battery-powered equipment. This device
features a shutdown mode for power-sensitive applications with a supply current of 7 µA during shutdown. The
TP A721 is available in an 8-pin SOIC surface-mount package and the surface-mount PowerP AD MSOP, which
reduces board space by 50% and height by 40%.

Audio

Input

Bias

Control

V

DD

700 mW

6

5

7

VO+

V

DD

1

24BYPASS

IN –

VDD/2

C

I

R

I

C

S

C

B

R

F

SHUTDOWN

VO–8

GND

From System Control

3 IN+

–

+

–

+

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.

Copyright  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.

1
2
3
4

8
7
6
5

SHUTDOWN

BYPASS

IN+

IN–

V

O

–
GND
V

DD

VO+

D OR DGN PACKAGE

(TOP VIEW)

PowerPAD is a trademark of Texas Instruments.

TPA721
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER

SLOS231B – NOVEMBER 1998 – REVISED MARCH 2000

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

AVAILABLE OPTIONS
PACKAGED DEVICES

T

A

SMALL OUTLINE

†

(D)

MSOP

‡

(DGN)

MSOP

Symbolization

–40°C to 85°C TPA721D TPA721DGN ABC

†

In the D package, the maximum output power is thermally limited to 350 mW; 700 mW peaks
can be driven, as long as the RMS value is less than 350 mW.

‡

The D and DGN packages are available taped and reeled. T o order a taped and reeled part, add
the suffix R to the part number (e.g., TP A301DR).

Terminal Functions

TERMINAL

NAME NO.

I/O

DESCRIPTION

BYPASS 2 I

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

to a 0.1-µF to 2.2-µF capacitor when used as an audio amplifier.
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 (IDD < 7 µA).
V

DD

6 VDD is the supply voltage terminal.
VO+ 5 O VO+ is the positive BTL output.
VO– 8 O VO– is the negative BTL output.

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

§

Supply voltage, VDD 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage, VI –0.3 V to VDD +0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation internally limited (see Dissipation Rating Table). . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T

A

–40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating junction temperature range, TJ –40°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

§

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

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

D 725 mW 5.8 mW/°C 464 mW 377 mW

DGN 2.14 W

¶

17.1 mW/°C 1.37 W 1.11 W

¶

Please see the Texas Instruments document,

PowerPAD Thermally Enhanced Package Application Report

(literature number SLMA002), for more information on the PowerPAD package. The thermal data was
measured on a PCB layout based on the information in the section entitled

T exas Instruments Recommended

Board for PowerPAD

on page 33 of the before mentioned document.

recommended operating conditions

MIN MAX UNIT

Supply voltage, V

DD

2.5

5.5

V

Operating free-air temperature, T

A

–40

85

°C

TPA721

700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER

SLOS231B – NOVEMBER 1998 – REVISED MARCH 2000

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics at specified free-air temperature, VDD = 3.3 V , TA = 25°C (unless otherwise
noted)

PARAMETER TEST CONDITIONS

MIN TYP MAX UNIT

V

OO

Output offset voltage (measured differentially)

See Note 1

20

mV

PSRR

Power supply rejection ratio

VDD = 3.2 V to 3.4 V

85

dB

I

DD

Supply current

BTL mode

1.25

2.5

mA

I

DD(SD)

Supply current, shutdown mode (see Figure 4)

7

50

µA

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

operating characteristics, VDD = 3.3 V, T

A

= 25°C, R

L

= 8 Ω

PARAMETER TEST CONDITIONS

MIN TYP MAX UNIT

P

O

БББББББББ

Output power, see Note 2

THD = 0.5%,

See Figure 9

250

mW

THD + N

БББББББББ

Total harmonic distortion plus noise

PO = 250 mW,

f = 200 Hz to 4 kHz, See Figure 7

0.55%

B

OM

БББББББББ

Maximum output power bandwidth

Gain = 2,

THD = 2%, See Figure 7

20

kHz

B

1

БББББББББ

Unity-gain bandwidth

Open Loop,

See Figure 15

1.4

MHz

k

SVR

БББББББББ

Supply ripple rejection ratio

f = 1 kHz,

CB = 1 µF, See Figure 2

79

dB

V

n

БББББББББ

Noise output voltage

Gain = 1,

CB = 0.1 µF, See Figure 19

17

µV(rms)

NOTE 2: Output power is measured at the output terminals of the device at f = 1 kHz.

electrical characteristics at specified free-air temperature, VDD = 5 V , TA = 25°C (unless otherwise
noted)

PARAMETER TEST CONDITIONS

MIN TYP MAX UNIT

V

OO

Output offset voltage (measured differentially)

20

mV

PSRR

Power supply rejection ratio

VDD = 4.9 V to 5.1 V

78

dB

I

DD

Supply current

1.25

2.5

mA

I

DD(SD)

Supply current, shutdown mode (see Figure 4)

50

100

µA

operating characteristics, VDD = 5 V, T

A

= 25°C, RL = 8 Ω

PARAMETER TEST CONDITIONS

MIN TYP MAX UNIT

P

O

БББББББББ

Output power

THD = 0.5%,

See Figure 13

700

†

mW

THD + N

БББББББББ

Total harmonic distortion plus noise

PO = 250 mW,

f = 200 Hz to 4 kHz, See Figure 11

0.5%

B

OM

БББББББББ

Maximum output power bandwidth

Gain = 2,

THD = 2%, See Figure 11

20

kHz

B

1

БББББББББ

Unity-gain bandwidth

Open Loop,

See Figure 16

1.4

MHz

k

SVR

БББББББББ

Supply ripple rejection ratio

f = 1 kHz,

CB = 1 µF, See Figure 2

80

dB

V

n

БББББББББ

Noise output voltage

Gain = 1,

CB = 0.1 µF, See Figure 20

17

µV(rms)

†

The DGN package, properly mounted, can conduct 700 mW RMS power continuously. The D package can only conduct 350 mW RMS power
continuously wtih peaks to 700 mW.

TPA721
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER

SLOS231B – NOVEMBER 1998 – REVISED MARCH 2000

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

Audio

Input

Bias

Control

V

DD

6

5

7

VO+

V

DD

1

24BYPASS

IN –

VDD/2

C

I

R

I

C

S

C

B

R

F

SHUTDOWN

VO–8

RL = 8

Ω

GND

3 IN+

–

+

–

+

Figure 1. BTL Mode Test Circuit

TYPICAL CHARACTERISTICS

Table of Graphs

FIGURE

k

SVR

Supply ripple rejection ratio vs Frequency 2

I

DD

Supply current vs Supply voltage 3, 4

p

p

vs Supply voltage 5

POOutput power

vs Load resistance 6

p

vs Frequency 7, 8, 11, 12

THD+N

Total harmonic distortion plus noise

vs Output power 9, 10, 13, 14
Open loop gain and phase vs Frequency 15, 16
Closed loop gain and phase vs Frequency 17, 18

V

n

Output noise voltage vs Frequency 19, 20

P

D

Power dissipation vs Output power 21, 22

TPA721

700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER

SLOS231B – NOVEMBER 1998 – REVISED MARCH 2000

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TYPICAL CHARACTERISTICS

Figure 2

–50

–60

–80

–100

20 100 1k

–30

–20

f – Frequency – Hz

SUPPLY RIPPLE REJECTION RATIO

vs

FREQUENCY

0

10k 20k

–10

–40

–70

–90

VDD = 5 V

VDD = 3.3 V

RL = 8 Ω
CB = 1 µF
BTL

k

SVR

–Supply Ripple Rejection Ratio – dB

Figure 3

VDD – Supply Voltage – V

SUPPLY CURRENT

vs

SUPPLY VOLTAGE

1.8

0.8

0.6

1

34

5.5

5

I

DD

– Supply Current – mA

BTL

2.5 3.5 4.5

1.6

1.2

1.4

VDD – Supply Voltage – V

SUPPLY CURRENT

vs

SUPPLY VOLTAGE

20
10

0

343.5 4.5

60

5

30

SHUTDOWN = High

40

50

5.52.5

I

DD

– Supply Current – Aµ

70

80

90

Figure 4

TPA721
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER

SLOS231B – NOVEMBER 1998 – REVISED MARCH 2000

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TYPICAL CHARACTERISTICS

VDD – Supply Voltage – V

OUTPUT POWER

vs

SUPPLY VOLTAGE

600

400

200

0

2.5 3.53 4 5.5

1000

P

4.5 5

O

– Output Power – mW

800

THD+N 1%
f = 1 kHz
BTL

RL = 32 Ω

RL = 8 Ω

Figure 5

RL – Load Resistance – Ω

OUTPUT POWER

vs

LOAD RESISTANCE

300

200

100

0

16 3224 40 64

800

8

P

48 56

O

– Output Power – mW

400

THD+N = 1%
f = 1 kHz
BTL

VDD = 5 V

500

600

VDD = 3.3 V

700

Figure 6

TPA721

700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER

SLOS231B – NOVEMBER 1998 – REVISED MARCH 2000

7

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TYPICAL CHARACTERISTICS

Figure 7

f – Frequency – Hz

THD+N –Total Harmonic Distortion + Noise – %

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

FREQUENCY

AV = –2 V/V

VDD = 3.3 V
PO = 250 mW
RL = 8 Ω
BTL

20 1k 10k

1

0.01

10

0.1

20k100

AV = –20 V/V

AV = –10 V/V

Figure 8

f – Frequency – Hz

THD+N –Total Harmonic Distortion + Noise – %

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

FREQUENCY

PO = 125 mW

VDD = 3.3 V
RL = 8 Ω
AV = –2 V/V
BTL

20 1k 10k

1

0.01

10

0.1

20k100

PO = 50 mW

PO = 250 mW

Figure 9

PO – Output Power – W

THD+N –Total Harmonic Distortion + Noise – %

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

OUTPUT POWER

0 0.15 0.4

1

0.01

10

0.1

0.2 0.25 0.3 0.35

VDD = 3.3 V
f = 1 kHz
AV = –2 V/V
BTL

0.05 0.1

RL = 8 Ω

Figure 10

PO – Output Power – W

THD+N –Total Harmonic Distortion + Noise – %

TOTAL HARMONIC DISTORTION PLUS NOISE

vs

OUTPUT POWER

f = 20 kHz

VDD = 3.3 V
RL = 8 Ω
CB = 1 µF
AV = –2 V/V
BTL

0.01 0.1 1

1

0.01

10

0.1

f = 1 kHz

f = 10 kHz

f = 20 Hz