LM4871

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SNAS002F – FEBRUARY 2000 – REVISED MAY 2013

LM4871

3W Audio Power Amplifier with Shutdown Mode

Check for Samples: LM4871

1

FEATURES

DESCRIPTION

The LM4871 is a mono bridged audio power amplifier

2

•

No Output Coupling Capacitors, Bootstrap

capable of delivering 3W of continuous average

Capacitors, or Snubber Circuits Required

power into a 3

Ω load with less than 10% THD when

•

Unity-gain Stable

powered by a 5V power supply (see Note). To

•

WSON, VSSOP, SOIC, or PDIP Packaging

conserve

power

in

portable

applications,

the

LM4871's micropower shutdown mode (IQ = 0.6µA,

•

External Gain Configuration Capability

typ) is activated when VDD is applied to the

•

Pin Compatible with the LM4861

SHUTDOWN pin.

Boomer

audio

power

amplifiers

are

designed

APPLICATIONS

specifically to provide high power, high fidelity audio

•

Portable Computers

output. They require few external components and

•

Desktop Computers

operate on low supply voltages from 2.0V to 5.5V.

Since the LM4871 does not require output coupling

•

Low Voltage Audio Systems

capacitors,

bootstrap

capacitors,

or

snubber

networks, it is ideally suited for low-power portable

KEY SPECIFICATIONS

systems that require minimum volume and weight.

•

PO at 10% THD+N, 1kHz

Additional LM4871 features include thermal shutdown

–

LM4871LD: 3

Ω , 4Ω Loads; 3W (typ),

protection, unity-gain stability, and external gain set.

2.5 W (typ)

Note: An LM4871LD that has been properly mounted

–

All other LM4871 Packages: 8

Ω load

to a circuit board will deliver 3W into 3

Ω (at 10%

1.5 W (typ)

THD). The other package options for the LM4871 will

•

Shutdown Current 0.6µA (typ)

deliver 1.5W into 8

Ω (at 10% THD). See the

Application Information section for further information

•

Supply Voltage Range 2.0V to 5.5 V

concerning the LM4871LD, LM4871MM, LM4871M,

•

THD at 1kHz at 1W Continuous Average

and the LM4871N.

Output Power into 8

Ω 0.5% (max)

Connection Diagrams

Figure 1. VSSOP, Small Outline, and PDIP

Figure 2. WSON Package (Top View)

Package

See Package Number NGN0008A

Top View

See Package Number DGK0008A, D0008A, or

D0008E

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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PRODUCTION DATA information is current as of publication date.

Copyright © 2000–2013, 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.