MINI560 DC 3.3V 5A Step-Down Stabilized Buck Converter Module

MINI560 DC 3.3V 5A Step-Down Stabilized Buck Converter Module is an ultra-compact, high-efficiency synchronous step-down (buck) voltage regulator module that converts a 5.5V to 20V DC input into a fixed, precision-stabilized 3.3V DC output at up to 5A peak current. Achieving up to 99% peak efficiency via synchronous MOSFET rectification and a molded alloy power inductor, it delivers high-current 3.3V power in a tiny 30mm × 18mm footprint with minimal heat generation.

Key Features:

• Fixed 3.3V High-Current Output (Up to 5A): Eliminates potentiometer drift by using fixed 1% precision feedback resistors to hold a rock-steady 3.3V DC rail.
• Synchronous Rectification (Up to 99% Peak Efficiency): Replaces lossy Schottky diodes with ultra-low-RDS(on) synchronous MOSFET switches for cool operation up to 3A–4A continuous without a heatsink.
• 500kHz High-Frequency Switching: Uses a shielded molded metal-alloy inductor and multi-layer ceramic capacitors (MLCCs) for ultra-low output ripple (<30mVp-p).
• Onboard Enable (EN) Control Pin: Logic-level EN pin allows a microcontroller to shut down the 3.3V output rail into microamp sleep mode.
• Power-Saving LED Jumper: Includes an onboard solder jumper to disconnect the indicator LED for ultra-low-power battery standby.

Technical Specifications:

• Model: MINI560-3.3V Synchronous Buck Module
• Input Voltage Range: 5.5V to 20.0V DC
• Output Voltage: 3.3V DC ± 1.5% Fixed
• Output Current: 3.5A–4.0A Continuous / 5.0A Peak (Add silicone thermal pad above 3.5A)
• Conversion Efficiency: 94% to 99%
• Switching Frequency: 500 kHz
• Output Voltage Ripple: < 30 mVp-p
• Operating Temperature Range: -40°C to +85°C

Mechanical Specifications:

• PCB Material: 4-Layer / Heavy-Copper FR-4 Fiberglass PCB
• Inductor: Integrally Molded Shielded Power Inductor
• Terminals: Castellated & Through-Hole Pads (IN+, IN-, OUT+, OUT-, EN)

Dimensions:

• Length: 30 mm
• Width: 18 mm
• Height: 5.4 mm
• Weight: ~5.5 g

Pinout and Wiring:

• IN+ : Connect 5.5V to 20V DC positive supply (e.g. 2S/3S/4S LiPo or 12V bus).
• IN- / OUT- : Common ground reference.
• OUT+ : Regulated +3.3V DC 5A output.
• EN (Enable Pad): Pulled high internally (Output ON by default); pull to GND to shut down output.

Datasheet Reference:

• Architecture: 500kHz Synchronous Step-Down DC-DC Regulator with Integrated Dual N-Channel MOSFETs

Commonly Used in:

• ESP32, ESP8266, and Cellular/GSM/LoRa Gateway 3.3V Power Rails
• FPV Drones, RC Aircraft, and Mobile Robotics 3.3V Logic Buses
• FPGA, CPLD, and High-Density 3.3V Sensor Arrays
• Battery-Powered 2S/3S/4S LiPo to 3.3V Embedded Systems

Applications:

• Steps down a 2S (7.4V), 3S (11.1V), or 4S (14.8V) LiPo battery or 12V power bus directly to 3.3V at up to 5A with negligible heat loss.
• Powers multi-radio IoT gateways combining ESP32, LoRa concentrators, and W5500 Ethernet modules from a single high-current 3.3V rail.
• Replaces hot-running AMS1117-3.3 linear regulators when stepping down 12V to 3.3V at currents above 200mA.

Equivalent Models:

• MINI560 DC 5V 5A Step-Down Stabilized Buck Converter Module: Identical 30mm × 18mm synchronous buck footprint configured for fixed 5.0V 5A output.
• DC 9V-16V to 3.3V 10A 50W Step-Down Buck Converter Power Module: Higher-current 10A fixed 3.3V buck module.

Package Includes:

• 1 × MINI560 DC 3.3V 5A Step-Down Stabilized Buck Converter Module