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LM4900M-LM4900MM-LM4900MMX-LM4900MX
265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mode
LM4900
265mW at 3.3V Supply Audio Power Amplifier with
Shutdown Mode
General Description

The LM4900isa bridged audio power amplifier capableof
delivering 265mWof continuous average power intoan8Ω
load with 1% THD+N froma 3.3V power supply.
Boomer® audio power amplifiers were designed specifically provide high quality output power froma low supply volt-
age while requiringa minimal amountof external compo-
nents. Since the LM4900 does not require output coupling
capacitors, bootstrap capacitorsor snubber networks,itis
optimally suitedfor low-power portable applications.
The LM4900 featuresan externally controlled, low power
consumption shutdown mode, and thermal shutdown protec-
tion.
The closed loop responseof the unity-gain stable LM4900
canbe configuredby external gain-setting resistors.
Key Specifications
THD+Nat 1kHzfor 265mW continuous
average output power into 8Ω,
VDD= 3.3V 1.0% (max) THD+Nat 1kHzfor 675mW continuous
average output power into 8Ω,
VDD=5V 1.0% (max) Shutdown current 0.1µA (typ)
Features
MSOP, LLP, and SOP packaging No output coupling capacitors, bootstrap capacitors,or
snubber circuits are necessary Thermal shutdown protection circuitry Unity-gain stable External gain configuration capability Latest generation "click and pop" suppression circuitry
Applications
Cellular phones PDA’s Any portable audio application
Typical Application

FIGURE1. Typical Audio Amplifier Application Circuit
September 2001
LM4900
265mW
3.3V
Supply
Audio
Power
Amplifier
with
Shutdown
Mode
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