MAX9837A audio Amplifier

₹200

01 — About

What it does

The MAX98357A is a compact, easy-to-use digital audio amplifier module that accepts I2S digital audio input and directly drives a speaker, eliminating the need for a separate DAC and amplifier stage. Based on the Maxim MAX98357A Class D amplifier IC, it combines an I2S digital-to-analog converter with a high-efficiency Class D power stage, making it ideal for ESP32, Raspberry Pi, and Arduino audio projects.

Key features

Digital I2S audio input – no external DAC required
Built-in Class D mono audio amplifier
Output power up to 3.2W into a 4-ohm speaker
High efficiency of up to 92 percent
No MCLK signal required for operation
Five selectable gain levels: 3dB, 6dB, 9dB, 12dB, 15dB
Supports Left, Right, or (Left/2 + Right/2) channel output
Built-in click and pop noise suppression
Short-circuit and thermal shutdown protection
Easy integration with ESP32, Raspberry Pi, and Arduino

Good to know

Requires a digital audio source with I2S output (LRC, BCLK, DIN); does not accept analog audio input.
Output is Bridge-Tied Load (BTL); connect the speaker directly and do not connect outputs to ground or another amplifier.
Pull the SD pin low to place the module in shutdown mode.
Select gain using the GAIN pin with pull-up or pull-down resistors as per the datasheet.
Use a speaker with matching impedance (4 ohm or 8 ohm) for correct power delivery.
Ensure adequate power supply capacity, especially at higher gain settings and output power.

02 — Datasheet

Specifications

Amplifier IC: MAX98357A
Amplifier Class: Class D (Mono)
Audio Input Interface: I2S Digital Audio
Output Power (4 ohm load): 3.2W typical at 5V, 10% THD
Output Power (8 ohm load): 1.8W typical at 5V, 10% THD
Supply Voltage: 2.5V to 5.5V DC
Quiescent Current: ~2.4 mA to 2.75 mA
Efficiency: Up to 92% (8 ohm load, 1W output)
Sample Rate Support: 8 kHz to 96 kHz
Sample Resolution: 16/24/32-bit
Gain Options: 3dB, 6dB, 9dB, 12dB, 15dB (pin selectable)
PSRR: 77 dB typical at 1 kHz
Interface Pins: LRC, BCLK, DIN, GAIN, SD, VIN, GND
Operating Temperature: -40°C to +85°C