Stereo 3.7W Class D Audio Amplifier – MAX98306


Stereo 3.7W Class D Audio Amplifier – MAX98306


SKU: BOB-099 - Mfg Part Number: 987


The incredibly tiny MAX98306 Amplifier Chip is surprising powerful! Being so small, Adafruit has kindly placed it on a breakout board and made it a lot more accessible. The board will deliver 2 x 3.7W channels into 3 ohm impedance speakers. Inside the chip is a class D controller that can run on anything between 2.7VDC and 5.5VDC. It also has built in thermal and over-current protection. The amp is over 90% efficient when driving an 8Ω speaker at over a Watt which makes it perfect for portable and battery-powered projects.

The inputs of the amplifier go through 1.0uF capacitors, so they are fully ‘differential’ – if you don’t have differential outputs, simply tie the “R-“ and “L-“ to ground. The outputs are “Bridge Tied” – that means they connect directly to the outputs, no connection to ground. The output is a 360KHz square wave PWM that is then ‘averaged out’ by the speaker coil – the high frequencies are not heard. All the above means that you can’t connect the output into another amplifier, it should drive the speakers directly.


  • Output Power: 3.7W at 3Ω, 10% THD, 1.7W at 8Ω, 10% THD, with 5V Supply
  • High 83dB PSRR at 217Hz
  • Five pin-selectable gains: 6dB, 9dB, 12dB, 15dB and 18dB
  • Thermal and short-circuit/over-current protection
  • Passes EMI limit unfiltered with up to 12 inches (30 cm) of speaker cable
  • Spread-Spectrum Modulation and Active Emissions Limiting
  • Excellent click-and-pop suppression
  • Low current draw: 2mA quiescent and 10uA in shutdown mode


In stock (can be backordered)

SKU: BOB-099. Category: . Tags: , , , .
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Additional information

Weight 7 g


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