1FEATURES

2• No Output Coupling Capacitors, Bootstrap

Capacitors, or Snubber Circuits Required

• Unity-gain Stable

• WSON, VSSOP, SOIC, or PDIP Packaging

• External Gain Configuration Capability

• Pin Compatible with the LM4861

APPLICATIONS

• Portable Computers

• Desktop Computers

• Low Voltage Audio Systems

KEY SPECIFICATIONS

• PO at 10% THD+N, 1kHz

– LM4871LD: 3Ω , 4Ω Loads; 3W (typ),

2.5 W (typ)

– All other LM4871 Packages: 8Ω load

1.5 W (typ)

• Shutdown Current 0.6μA (typ)

• Supply Voltage Range 2.0V to 5.5 V

• THD at 1kHz at 1W Continuous Average

Output Power into 8Ω 0.5% (max)

DESCRIPTION

The LM4871 is a mono bridged audio power amplifier

capable of delivering 3W of continuous average

power into a 3Ω load with less than 10% THD when

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

conserve power in portable applications, the

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

typ) is activated when VDD is applied to the

SHUTDOWN pin.

Boomer audio power amplifiers are designed

specifically to provide high power, high fidelity audio

output. They require few external components and

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

Since the LM4871 does not require output coupling

capacitors, bootstrap capacitors, or snubber

networks, it is ideally suited for low-power portable systems that require minimum volume and weight.

Additional LM4871 features include thermal shutdown

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

Note: An LM4871LD that has been properly mounted

to a circuit board will deliver 3W into 3Ω (at 10%

THD). The other package options for the LM4871 will

deliver 1.5W into 8Ω (at 10% THD). See the

Application Information section for further information

concerning the LM4871LD, LM4871MM, LM4871M,

and the LM4871N.