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Features
Minimal amount of external components necessary
Quiet fade-in/out mute mode
Low current Standby-mode
Description The LM4731 is a stereo audio amplifier capable of delivering typically 25W per channel of continuous average output power
into a 4Ω or 8Ω load with less than 10% THD+N from 20Hz - 20kHz.
Each amplifier has an independent smooth transition fade-in/out mute and a power conserving standby mode which can be controlled
by external logic.
The LM4731 has short circuit protection and a thermal shut down feature that is activated when the die temperature exceeds
150°C. The LM4731 also has a under voltage lock out feature for click and pop free power off and on.
The LM4731 has a wide operating supply range from +/-10V - +/-28V allowing for lower cost unregulated power supplies to be
used.
Key Specification
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Output Power into 4Ω or 8Ω, 10% THD+N
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25W (typ)
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THD+N at 1kHz with 2 x 1W into 8Ω
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0.02% (typ)
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Mute Attenuation
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85dB (typ)
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PSRR with fRIPPLE = 120Hz,
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VRIPPLE = 1VRMS
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50dB (typ)
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Slew Rate
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18V/µs (typ)
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Standby Current (+/-22V)
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4.8mA (typ)
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Applications
Audio amplifier for high-end stereo TVs
Audio amplifier for component stereo
Audio amplifier for compact stereo
Audio amplifier for PC satellite speaker systems
Audio amplifier for self powered speakers
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