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987 Adafruit: 3.7W x2 @ 3Ω, 2.7 ~ 5.5Vin, Class D

Summary

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, it’s incredibly efficient (over 90% efficient when driving an 8Ω speaker at over a Watt).

This amplifier is perfect for portable and battery-powered projects. It has built in thermal and over-current protection, but you really have to drive it hard before it even gets warm! This board is a welcome upgrade to basic "LM386" amps.

Specifications

Manufacturer Adafruit Industries LLC
Category Audio Amplifiers
Eval Board Part Number 1528-1380-ND
Eval Board Supplier Adafruit Industries LLC
Eval Board Normally In Stock
Amplifier Type Class D
Number of Outputs Stereo
Output Power (RMS) @ Load 3.7 W x 2 @ 3 Ω
Voltage In 2.7 ~ 5.5 V
THD+N (1kHz) @ Conditions < 0.05% @ 650 mW (4 Ω, 3.7V)
Features Click and Pop Suppression
Digital Gain
Filterless Output
Frequency Jitter for EMI
Over Current Protection
Shutdown, Enable, Standby
Efficiency @ Conditions >85%, 5V in, 20 ~20 kHz @ 0.25 ~ 1.7 W (8 Ω )
>85%, 3.7V in, 20 ~20 kHz @ 0.2 ~ 0.9 W (8 Ω )
>80%, 5V in, 20 ~20 kHz @ 0.4 ~ 2.9 W (4 Ω )
>80%, 3.7V in, 20 ~20 kHz @ 0.2 ~ 1.55 W (4 Ω )
>75%, 5V in, 20 ~20 kHz @ 0.25 ~ 3.4 W (3 Ω )
>75%, 3.7V in, 20 ~20 kHz @ 0.2 ~ 1.8 W (3 Ω )
Component Count + Extras 11 + 4
Design Author Adafruit
Application / Target Market Cellular Phone
MP3 Players
Portable Devices
Powered Speakers
Tablets
VOIP Phones
Standby Current [Typical] 1 µA
Quiescent Current [Typical] 2 mA
Standby Current [Maximum] 10 µA
Quiescent Current [Maximum] 2.7 mA
Main I.C. Base Part MAX98306
Date Created By Author 2013-01
Date Added To Library 2016-04

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