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LM4809LD-LM4809LDX-LM4809LQ-LM4809LQX-LM4809MA-LM4809MAX-LM4809MM-LM4809MMX
LM4809 Dual 105mW Headphone Amplifier with Active-Low Shutdown Mode
LM4809
Dual 105mW Headphone Amplifier with Active-Low
Shutdown Mode
General DescriptionThe LM4809isa dual audio power amplifier capableof
delivering 105mWper channelof continuous average power
intoa 16Ω load with 0.1% (THD+N) froma5V power supply.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal amountof
external components. Since the LM4809 does not require
bootstrap capacitorsor snubber networks,itis optimally
suitedfor low-power portable systems.
The unity-gain stable LM4809 canbe configuredby external
gain-setting resistors.
The LM4809 featuresan externally controlled, active-low,
micropower consumption shutdown mode,as wellasan
internal thermal shutdown protection mechanism.
Key Specifications THD+Nat 1kHzat 105mW continuous average power
into 16Ω 0.1% (typ) THD+Nat 1kHzat 70mW continuous average power
into 32Ω 0.1% (typ) Shutdown Current 0.4µA (typ)
Features Active-low shutdown mode "Click and Pop" reduction circuitry Low shutdown current LLP, MSOP, and SO surface mount packaging No bootstrap capacitors required Unity-gain stable
Applications Headphone Amplifier Personal Computers Microphone Preamplifier PDA’s
Typical Application*Refertothe
Application Information Sectionfor information concerning proper selectionofthe inputand output coupling capacitors.
FIGURE1. Typical Audio Amplifier Application CircuitApril 2004
LM4809
Dual
105mW
Headphone
Amplifier
with
Active-Low
Shutdown
Mode
