Stereo 3.7W Class D Audio Amplifier - MAX98306

4.000 KD

Description


This
incredibly small stereo amplifier is surprisingly powerful - 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.
Since the amp is a class D, its incredibly efficient (over 90% efficient
when driving an 8Ω speaker at over a Watt) - making it perfect for
portable and battery-powered projects. It has built in thermal and
over-current protection but we could barely tell it got hot. This board
is a welcome upgrade to basic "LM386" amps!


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.

Comes with a fully assembled and tested breakout board
with 1.0uF input capacitors. We also include header to plug it into a
breadboard, 3.5mm screw-terminal blocks so you can easily attach/detach
your speakers, and a 2x4 header + jumper to change the amplifier gain on
the fly. You will be ready to rock in 15 minutes! Speakers are not included, use any 3ohm or greater impedance speakers.


  • 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


This product is available.