Stereo 3.7W Class D Audio Amplifier - MAX98306

This compact stereo amplifier delivers impressive power in a tiny package, capable of providing 2 x 3.7W into 3-ohm speakers. Ideal for portable, battery-powered projects, it operates from 2.7V to 5.5VDC, boasting over 90% efficiency, especially when driving 8Ω speakers. It features built-in thermal and over-current protection, remaining cool under load. Here's an overview of its key features:

• Output Power:
  • 3.7W at 3Ω, 10% THD
  • 1.7W at 8Ω, 10% THD (with 5V supply)
• Class D Efficiency: Over 90% efficient, making it perfect for portable applications.
• Input: Fully differential with 1.0uF capacitors; can easily work with non-differential outputs by grounding the R- and L- terminals.
• Bridge-Tied Output: Direct connection to speakers with no ground, producing a 360KHz PWM output that’s averaged by the speaker coil, making high frequencies inaudible.
• Convenient Setup:
  • Comes with a fully assembled and tested breakout board.
  • Includes pre-soldered 3.5mm screw-terminal blocks for easy speaker connection.
  • Features a pre-soldered 2x4 header and a jumper for adjusting amplifier gain.
  • Plug it into a breadboard and be ready in minutes.
• Gain Options: Select from five pin-selectable gains: 6dB, 9dB, 12dB, 15dB, and 18dB.
• Performance:
  • High 83dB PSRR at 217Hz
  • Spread-Spectrum Modulation and Active Emissions Limiting
  • Excellent click-and-pop suppression
• Protection: Thermal and short-circuit/over-current protection built-in.
• Low Power Consumption: Only 2mA quiescent current and 10uA in shutdown mode.
• Speaker Compatibility: Works with 3Ω or greater impedance speakers (not included).
• Compact Size: Product dimensions: 28.1mm x 24.0mm x 10.4mm (1.1" x 0.9" x 0.4").
• Weight: 4.6g (0.2oz).

Revision History:

• April 10, 2024: Board now includes pre-soldered terminal blocks and 2x4 header.
• December 5, 2022: PCB updated with a clearer silkscreen design (Adafruit Pinguin) for better legibility.