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LM4902LD-LM4902LDX-LM4902MM-LM4902MMX
265mW at 3.3V Supply Audio Power Amplifier with Shutdown Mode
LM4902
265mW at 3.3V Supply Audio Power Amplifier with
Shutdown Mode
General DescriptionThe LM4902isa 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 LM4902 does not require output coupling
capacitors, bootstrap capacitorsor snubber networks,itis
optimally suitedfor low-power portable applications.
The LM4902 featuresan externally controlled, low power
consumption shutdown mode, and thermal shutdown protec-
tion.
The closed loop responseof the unity-gain stable LM4902
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 and LLP 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 ApplicationFIGURE1. Typical Audio Amplifier Application Circuit
February 2002
LM4902
265mW
3.3V
Supply
Audio
Power
Amplifier
with
Shutdown
Mode
