October 2002
LM4872
1 Watt Audio Power Amplifier in micro SMD package
General Description
The LM4872 is a bridge-connected audio power amplifier
capable of delivering 1 W of continuous average power to an
8Ω load with less than .2% (THD) from a 5V power supply.
Key Specifications
n Power Output at 0.2% THD
n Shutdown Current
1W (typ)
0.01µA (typ)
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 op-
timally suited for low-power portable applications.
Features
n micro SMD package (see App. note AN-1112)
n 5V - 2V operation
n No output coupling capacitors or bootstrap capacitors.
n Unity-gain stable
n External gain configuration capability
The LM4872 features an externally controlled, low-power
consumption shutdown mode, as well as an internal thermal
shutdown protection mechanism.
Applications
n Cellular Phones
The unity-gain stable LM4872 can be configured by external
gain-setting resistors.
n Portable Computers
n Low Voltage Audio Systems
Typical Application
10123001
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2002 National Semiconductor Corporation
DS101230
www.national.com
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