October 4, 2011
250mW Audio Power Amplifier with Shutdown Mode
General Description
Features
The LM4882 is a single-ended audio power amplifier capable
of delivering 250mW of continuous average power into an
8Ω load with 1% THD+N from 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 LM4882 does not require bootstrap capacitors or snubber
networks, it is optimally suited for low-power portable systems.
The LM4882 features an externally controlled, low power
consumption shutdown mode which is virtually clickless and
popless, as well as an internal thermal shutdown protection
mechanism.
The unity-gain stable LM4882 can be configured by external
gain-setting resistors.
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MSOP surface mount packaging
“Click and Pop” Suppression Circuitry
Supply voltages from 2.4V–5.5V
Operating Temperature −40°C to 85°C
Unity-gain stable
External gain configuration capability
No bootstrap capacitors, or snubber circuits are necessary
Key Specifications
■ THD+N at 1kHz at 250mW
continuous average output
power into 8Ω
1.0% (max)
■ Output Power at 1% THD+N
at 1kHz into 4Ω
Applications
380mW (typ)
■ THD+N at 1kHz at 85mW
■ Personal Computers
■ Cellular Phones
■ General Purpose Audio
continuous average output
power into 32Ω
0.1% (typ)
■ Shutdown Current
0.7µA (typ)
Typical Application
10003001
*Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2011 National Semiconductor Corporation
100030
100030 Version 6 Revision 9
www.national.com
Print Date/Time: 2011/10/04 15:41:42
LM4882 250mW Audio Power Amplifier with Shutdown Mode
OBSOLETE
LM4882
