MAX98357 I2S 3W Class D Amplifier Module

The MAX98357 is a compact, high-efficiency Class-D audio amplifier module designed for digital audio systems using the I2S interface. It converts digital I2S audio signals directly into amplified audio output, eliminating the need for an external DAC. This module is widely used in microcontroller and single-board computer projects such as Arduino, ESP32, ESP8266, and Raspberry Pi, providing clear mono audio output for small speakers.

Technical Specifications:

• Audio interface: I2S (BCLK, LRC/WS, DIN)
• Amplifier type: Class-D, mono
• Output power: Up to 3 W (into 4 Ω speaker at 5 V)
• Supply voltage: 2.7 V to 5.5 V
• Speaker impedance: 4 Ω to 8 Ω
• Efficiency: Up to ~90%
• Gain control: Fixed or configurable via pin
• Shutdown control: Integrated enable/shutdown pin
• Form factor: Compact breakout board with header pins and screw terminal for speaker

Features:

• Direct digital-to-speaker solution with no external DAC required
• High efficiency Class-D operation with low heat generation
• Simple I2S connection to microcontrollers and SBCs
• Supports standard I2S audio formats
• Compact size suitable for embedded and portable projects
• Low noise and good audio clarity for its size and power rating

Applications:

• Embedded audio systems
• IoT devices with sound output
• DIY speakers and smart gadgets
• Voice prompts and alert systems
• Educational and prototyping audio projects