SNAS002F – FEBRUARY 2000 – REVISED MAY 2013
3W Audio Power Amplifier with Shutdown Mode
Check for Samples: LM4871
•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
• Portable Computers
• Desktop Computers
• Low Voltage Audio Systems
• 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)
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
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.
Figure 1. VSSOP, Small Outline, and PDIP
See Package Number DGK0008A, D0008A, or
Figure 2. WSON Package (Top View)
See Package Number NGN0008A
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