LM4872 1 Watt Audio Power Amplifier micro SMD package
February 2000
LM4872
1 Watt Audio Power Amplifier in micro SMD package
General Description
The LM4872 is a bridge-connected audio power amplifier ca-
pable of delivering 1 W of continuous average power to an
8Ω load with less than .2% (THD) 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. Since the LM4872 does not require
output coupling capacitors or bootstrap capacitors. It is opti-
mally suited for low-power portable applications.
The LM4872 features an externally controlled, low-power
consumption shutdown mode, as well as an internal thermal
shutdown protection mechanism.
The unity-gain stable LM4872 can be configured by external
gain-setting resistors.
Key Specifications
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Power Output at 0.2% THD
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Shutdown Current
1 W (typ)
0.01 µA (typ)
Features
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n
n
n
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micro SMD package (see App. note AN-1112)
5V - 2V operation
No output coupling capacitors or bootstrap capacitors.
Unity-gain stable
External gain configuration capability
Applications
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Cellular Phones
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Portable Computers
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Low Voltage Audio Systems
Typical Application
Connection Diagram
8 Bump micro SMD
DS101230-23
Top View
Order Number LM4872IBP, LM4872IBPX
See NS Package Number BPA08B6B
DS101230-1
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation
DS101230
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
