LM4900M National Semiconductor, LM4900M Datasheet
LM4900M
Manufacturer Part Number
LM4900M
Description
SOP8
Manufacturer
National Semiconductor
Specifications of LM4900M
Date_code
07+
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© 2001 National Semiconductor Corporation
LM4900
265mW at 3.3V Supply Audio Power Amplifier with
Shutdown Mode
General Description
The LM4900 is a bridged audio power amplifier capable of
delivering 265mW of continuous average power into an 8
load with 1% THD+N from a 3.3V power supply.
Boomer
to provide high quality output power from a low supply volt-
age while requiring a minimal amount of external compo-
nents. Since the LM4900 does not require output coupling
capacitors, bootstrap capacitors or snubber networks, it is
optimally suited for low-power portable applications.
The LM4900 features an externally controlled, low power
consumption shutdown mode, and thermal shutdown protec-
tion.
The closed loop response of the unity-gain stable LM4900
can be configured by external gain-setting resistors.
Key Specifications
j
j
j
Typical Application
Boomer
FIGURE 1. Typical Audio Amplifier Application Circuit
THD+N at 1kHz for 265mW continuous
THD+N at 1kHz for 675mW continuous
Shutdown current
average output power into 8 ,
V
average output power into 8 ,
V
DD
DD
®
is a registered trademark of National Semiconductor Corporation.
®
= 3.3V
= 5V
audio power amplifiers were designed specifically
DS200064
1.0% (max)
1.0% (max)
0.1µA (typ)
Features
n MSOP, LLP, and SOP packaging
n No output coupling capacitors, bootstrap capacitors, or
n Thermal shutdown protection circuitry
n Unity-gain stable
n External gain configuration capability
n Latest generation ’click and pop’ suppression circuitry
Applications
n Cellular phones
n PDA’s
n Any portable audio application
snubber circuits are necessary
DS200064-1
September 2001
www.national.com
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