SNAS095C – MAY 1997 – REVISED MAY 2013
LM4861
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1.1W Audio Power Amplifier with Shutdown Mode
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FEATURES
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No output coupling capacitors, bootstrap
capacitors, or snubber circuits are necessary
Small Outline (SOIC) packaging
Compatible with PC power supplies
Thermal shutdown protection circuitry
Unity-gain stable
External gain configuration capability
DESCRIPTION
The LM4861 is a bridge-connected audio power
amplifier capable of delivering 1.1W of continuous
average power to an 8Ω load with 1% THD+N using
a 5V power supply.
Boomer audio power amplifiers were designed
specifically to provide high quality output power with a
minimal amount of external components using
surface mount packaging. Since the LM4861 does
not require output coupling capacitors, bootstrap
capacitors, or snubber networks, it is optimally suited
for low-power portable systems.
The LM4861 features an externally controlled, low-
power consumption shutdown mode, as well as an
internal thermal shutdown protection mechanism.
The unity-gain stable LM4861 can be configured by
external gain-setting resistors for differential gains of
up to 10 without the use of external compensation
components. Higher gains may be achieved with
suitable compensation.
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APPLICATIONS
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Personal computers
Portable consumer products
Self-powered speakers
Toys and games
KEY SPECIFICATIONS
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THD+N for 1kHz at 1W continuous average
output power into 8Ω 1.0% (max)
Output power at 10% THD+N at 1kHz into 8Ω
1.5 W (typ)
Shutdown Current 0.6µA (typ)
Connection Diagram
Figure 1. 8-Lead SOIC - Top View
See D Package
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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Copyright © 1997–2013, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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