CJMCU-98306 MAX98306 Stereo Class D Amplifier Class AB Audio 3.7W

 

 

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.
Feature:
The MAX98306 stereo 3.7W Class D amplifier provides Class AB audio performance and Class D efficiency. The device sets five optional gain settings (6dB, 9dB, 12dB, 15dB and 18dB) through a gain selection input (GAIN).
The IC’s quiescent current and 3.7V power supply 2.0 mA extend battery life in portable applications. It is also packaged in a 14-pin TDFN (3mm x 3mm low profile (0.75mm)) package with a rated temperature range of -40°C to +85°C
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
Package Included:
1PCS* MCU-98306 MAX98306 stereo class D amplifier class AB audio 3.7W