Stereo 3.7W Class D Audio Amplifier – MAX98306

This small stereo amplifier is able to deliver 2 x 3.7W channels into 3 ohm impedance speakers.

Inside the miniature chip is a class D controller, able to run from 2.7V-5.5VDC. It is incredibly efficient (over 90% efficient when driving an 8Ω speaker at over a Watt) and has built in thermal and over-current protection.

Technical Specification

• Output Power: 3.7W at 3Ω, 10% THD, 1.7W at 8Ω, 10% THD, with 5V Supply
• Passes EMI limit unfiltered with up to 12 inches (30 cm) of speaker cable
• High 83dB PSRR at 217Hz
• Spread-Spectrum Modulation and Active Emissions Limiting
• Five pin-selectable gains: 6dB, 9dB, 12dB, 15dB and 18dB. Select with a jumper or by setting the G and G’ breakout pins (see schematic for breakout board showing gain pin settings for details)
• Excellent click-and-pop suppression
• Thermal and short-circuit/over-current protection
• Low current draw: 2mA quiescent and 10uA in shutdown mode

Dimensions (without 0.1″ header):

• Length:28.25mm/1.11in
• Width:24.15mm/0.95in
• Height:3.03mm/0.12in
• Weight:2.33g

MAX98306 Datasheet

Schematic for breakout board showing gain pin settings

Tutorial: Stereo 3.7W Class D Audio Amplifier