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LM4882
250mW Audio Power Amplifier with Shutdown Mode
General Description
The LM4882 is a single-ended audio power amplifier ca-
pable of delivering 250mW of continuous average power into
an 8
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 por-
table 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.
Key Specifications
j THD+N at 1kHz at 250mW
continuous average output
power into 8
1.0% (max)
j Output Power at 1% THD+N
at 1kHz into 4
380mW (typ)
j THD+N at 1kHz at 85mW
continuous average output
power into 32
0.1% (typ)
j Shutdown Current
0.7A (typ)
Features
n
MSOP surface mount packaging
n
“Click and Pop” Suppression Circuitry
n
Supply voltages from 2.4V–5.5V
n
Operating Temperature 40C to 85C
n
Unity-gain stable
n
External gain configuration capability
n
No bootstrap capacitors, or snubber circuits are
necessary
Applications
n
Personal Computers
n
Cellular Phones
n
General Purpose Audio
Typical Application
Boomer is a registered trademark of National Semiconductor Corporation.
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
January 2003
LM4882
250mW
Audio
Power
Amplifier
with
Shutdown
Mode
2003 National Semiconductor Corporation
DS100030
www.national.com
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