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5W Stereo Audio Amplifier PAM8406 - Overview

5W Stereo Audio Amplifier PAM8406​

This board is a stereo Class-D audio amplifier built around the PAM8406, delivering up to 5W per channel into a 2Ω speaker load. Audio comes in through an onboard 3.5mm stereo jack or an alternate wired input header, and each channel is filtered and broken out to its own screw terminal for connecting a speaker directly. A separate control header exposes the amplifier's mode, shutdown, and mute pins, so a microcontroller can enable, disable, or mute playback in software. The board runs directly from 2.5V to 5.5V with no onboard regulator, so whatever voltage you feed it is what the amplifier sees.

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Key features​

  • PAM8406 Class-D stereo amplifier, switchable to Class-AB via the MODE pin
  • 5W output into 2Ω at 5V (10% THD), 3.14W into 4Ω at 5V
  • Up to 90% efficiency in Class-D mode (varies by speaker load: ~80% into 2Ω, up to 90% into 8Ω)
  • Filterless Class-D architecture, with an onboard LC output filter on each channel for extra EMI suppression
  • 2.5V to 5.5V operating range, powered directly with no onboard regulator
  • 3.5mm stereo aux input jack, plus a wired input header for the same left/right/ground signals
  • Screw terminal outputs for both speaker channels
  • MODE / SHDN / MUTE control header for microcontroller-driven mode switching, shutdown, and muting
  • Built-in short-circuit and thermal protection, with automatic recovery