I2S Class-D Amplifier Module (MAX98357) — 6-Pack (Concise English Description)
Compact, plug-and-play I2S Class-D amplifier modules based on the MAX98357. Accepts standard I2S digital audio (DIN / BCLK / LRC) and directly drives a speaker—no separate DAC or amplifier required. Ideal for Raspberry Pi, ESP32, Arduino (with I2S), portable projects and small smart speakers.
Key Features
Chip: MAX98357 (I2S Class-D)
Supply: DC 2.5–5.5V (recommended 5V)
Output power (5V, 10% THD): ≈ 3.2 W @ 4Ω, 1.8 W @ 8Ω
Formats: I2S / 12S / LJ / TDM; sample rates 8–96 kHz
No external MCLK required; built-in click/pop suppression
Selectable gains: 3 / 6 / 9 / 12 / 15 dB via GAIN pin
Default output: L+R mono mix; SD/MODE selects shutdown or left/right channel
Bridge-Tied (BTL) outputs — drives speakers directly; integrated thermal & over-current protection
PSRR: ~77 dB (1 kHz). Weight: ~5 g per board.
Pinout (quick)
VCC — power in (2.5–5.5V)
GND — ground
DIN — I2S data in
BCLK — bit clock
LRC — left/right (LRCLK) or TDM sync
SD / MODE — shutdown / channel select (pull LOW = shutdown)
GAIN — set gain with pull-up / pull-down or direct wiring
Usage & Precautions
Outputs are PWM BTL — connect only to a speaker. Do not tie outputs to ground or feed into another amplifier input.
Ensure ventilation; high continuous power increases temperature. Add heatsinking if needed.
Use a stable power supply to avoid noise or triggering protection. Wire with power off; test first at low gain.
Recommended for small speakers (4–8Ω). Avoid long continuous periods at maximum power.
Package Contents
6 × MAX98357 I2S Class-D amplifier modules
1 × Male-to-Female Dupont jumper wire
1 × Female-to-Female Dupont jumper wire