PAM8403 5V Dual-Channel 3W Mini Digital Audio Amplifier Board

• The PAM8403 is an ultra-compact, high-efficiency digital audio amplifier chip designed to deliver clean, distortion-free sound reproduction. Because it utilizes a filterless Class-D design, it can connect straight to miniature speakers without needing complicated inductor-capacitor low-pass filters, preserving board space and reducing component count.

Operating smoothly on a DC voltage range from 2.5V to 5.5V, it can easily draw power straight from standard 5V USB ports, phone chargers, or single-cell lithium-ion batteries. Built-in thermal overload protection and short-circuit safeguards ensure the board remains secure and durable during continuous operation.

Key Features & Benefits:

• High Efficiency Class-D Design: Achieves up to 90% efficiency, keeping power loss minimal and extending battery life in portable setups.

• Dual-Channel Stereo Output: Delivers clean 3W + 3W audio performance when paired with 4Ω speakers at 5V.

• Flexible Power Supply: Operates effortlessly on a standard 2.5V to 5.5V DC input voltage range.

• Filterless Architecture: Eliminates extra external filters, allowing direct connection to speakers.

• Built-In Safety Controls: Includes integrated short-circuit protection and thermal shutdown mechanisms.

Applications:

• DIY portable mini Bluetooth and auxiliary speakers

• Microcontroller and Arduino-based audio announcement modules

• Custom sound replacements for desktop monitors, smart gadgets, and handheld gaming units

• Low-power wearable audio experiments