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FEATURES

DESCRIPTION

1

2

3

4

8

7

6

5

SHUTDOWN

BYPASS

IN+

IN–

GND

D OR DGN PACKAGE

(TOP VIEW)

Audio

Input

Bias

Control

700 mW

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5

7

1

2

4

BYPASS

IN–

SHUTDOWN

GND

From System Control

3

IN+

–

+

–

+

TPA721

SLOS231E – NOVEMBER 1998 – REVISED JUNE 2004

700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER

•

Fully Specified for 3.3-V and 5-V Operation

The TPA721 is a bridge-tied load (BTL) audio power

amplifier developed especially for low-voltage appli-

•

Wide Power Supply Compatibility 2.5 V – 5.5 V

cations

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

•

Integrated Depop Circuitry

to 20 kHz, its operation is optimized for narrower

•

Thermal and Short-Circuit Protection

band applications such as wireless communications.

•

Surface-Mount Packaging

The BTL configuration eliminates the need for exter-

nal coupling capacitors on the output in most appli-

– SOIC

cations, which is particularly important for small

– PowerPAD™ MSOP

battery-powered equipment. This device features a

shutdown mode for power-sensitive applications with

a supply current of 7 µA during shutdown. The

TPA721 is available in an 8-pin SOIC surface-mount

package and the surface-mount PowerPAD MSOP,

which reduces board space by 50% and height by

40%.

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.

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 1998–2004, 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.