MINI560 Synchronous Buck Converter — 3.3V / 5A Step-Down Module

The MINI560 is a compact, high-efficiency DC-DC step-down module built around a JoulWatt JW5069A synchronous buck regulator in a tiny QFN-20 (3×3mm) package. Unlike older asynchronous regulators, synchronous rectification delivers up to 95% efficiency, meaning less wasted power, lower heat, and a smaller footprint for the same load.

Running at a 500 kHz switching frequency, the module keeps output ripple tight while using minimal board space — ideal for embedding in projects where every millimeter counts.

Specifications

• Regulator IC: JoulWatt JW5069A (synchronous buck, QFN-20 3×3mm)
• Input voltage: 4V – 23V DC
• Output voltage: 3.3V (factory-set)
• Output current: up to 5A continuous
• Switching frequency: ~500 kHz
• Efficiency: up to 95%
• Topology: non-isolated synchronous buck
• Operating temperature: -40°C to +85°C
• Dimensions: 30 × 18 × 5.4 mm
• Weight: 5.5 g

Adjustable on demand — the output is set by 0603 1% feedback resistors, so the 3.3V rail can be reconfigured by experienced users if needed.

Typical applications

• Powering 3.3V microcontrollers, sensors, and embedded systems
• Stepping down battery packs (2S–5S Li-ion, 12V/24V rails)
• Communication and wireless modules
• General-purpose 3.3V supply for electronics projects

In the box: 1 × MINI560 3.3V/5A Synchronous Buck Module

Adjustable output (advanced) — The output voltage is set by a single 0603 1% feedback resistor. Experienced users can change the output rail by swapping this resistor to one of the following values:

Note: changing the feedback resistor adjusts the output voltage only — always stay within the module's 4–23V input range and 5A output limit, and ensure the target voltage is below (input − ~1.5V) for proper regulation.

For more in-depth analysis of this module, checkout the article below:

https://hackmd.io/@mrhw/ByyFpwR70