DC-DC Buck Mini Module – 5V/3.3V 4A

The Waveshare DC-DC Buck Converter Mini Module is a compact, high-efficiency step-down voltage regulator designed to convert higher DC input voltages into a stable 5V or 3.3V DC output. With a wide input voltage range, up to 4A output current and approximately 90% conversion efficiency, this mini DC-DC buck converter is ideal for Arduino, ESP32, Raspberry Pi projects, robotics, IoT devices and embedded electronic applications.

Featuring a compact black PCB with an immersion gold finish, the module measures just 33 × 16 × 5.7mm, making it easy to integrate into space-constrained electronic projects and custom PCB designs.

This version (DC5-36-TO-DC3V3-5-M) comes with pre-soldered pin headers and screw terminals, allowing convenient connections to power supplies and electronic devices.

Key Features

• Selectable 5V or 3.3V Output: Provides a regulated DC output voltage, configurable by repositioning the onboard 0Ω resistor.

• Wide Input Voltage Range: Supports DC 6–36V input in 5V mode and DC 5–36V input in 3.3V mode.

• Up to 4A Output Current: Suitable for a wide range of electronic devices and power supply applications.

• High Conversion Efficiency: Approximately 90% efficiency helps minimise power loss.

• Compact Miniature Design: Measures only 33 × 16 × 5.7mm for easy integration into embedded systems.

• 500kHz Switching Frequency: Efficient step-down voltage regulation.

• Immersion Gold PCB: Black PCB with immersion gold finish and castellated holes for convenient integration.

• Pre-Soldered Connections: Equipped with pin headers and screw terminals for easier installation.

• Versatile Applications: Suitable for microcontrollers, robotics, IoT electronics and custom DC power systems.

Technical Specifications

• Brand: Waveshare

• Model: DC5-36-TO-DC3V3-5-M

• Product Type: DC-DC Step-Down Buck Converter Module

• Input Voltage (5V Mode): DC 6–36V

• Input Voltage (3.3V Mode): DC 5–36V

• Output Voltage: DC 5V (factory default) or DC 3.3V (configurable)

• Output Current: 0–4A

• Peak Output Current: Up to 5A under extreme conditions with adequate heat dissipation

• Conversion Efficiency: Approximately 90%

• Switching Frequency: 500kHz

• Dimensions: 33 × 16 × 5.7mm

• PCB Finish: Black immersion gold

• Connections: Pre-soldered pin headers and screw terminals

• Output Configuration: Solder-selectable using onboard 0Ω resistor

Configurable 5V or 3.3V Output

The Waveshare Mini Buck Converter is supplied with a factory-default 5V DC output, suitable for powering compatible microcontrollers, development boards and other 5V electronic devices.

For applications requiring 3.3V, the output can be changed by repositioning the onboard 0Ω resistor using a soldering iron.

• 5V Output Mode: Requires a DC input voltage between 6V and 36V.

• 3.3V Output Mode: Requires a DC input voltage between 5V and 36V.

This flexibility makes the module useful for electronics projects requiring different regulated supply voltages.

Note: The output voltage is selectable between 5V and 3.3V only. It is not a continuously adjustable voltage regulator.

Compact Design for Easy Integration

The miniature PCB features castellated mounting holes and an immersion gold finish, allowing the module to be incorporated into custom electronic designs.

Its compact size makes it suitable for embedded systems, robotics, control boards and applications where installation space is limited.

The pre-soldered pin headers and screw terminals provide convenient connection options without requiring additional connectors.

Typical Applications

• Arduino and ESP32 power supply projects

• Raspberry Pi and compatible development board power applications

• Robotics and automation systems

• IoT devices and wireless sensor networks

• DIY electronic circuits and embedded systems

• 12V and 24V DC to 5V or 3.3V power conversion

• Industrial control and monitoring equipment

• Battery-powered electronic projects

• Custom PCB designs and electronic prototyping

• Low-voltage DC power distribution

Connection Interfaces

Power Input:

• VIN+: Positive DC power input

• VIN-: Negative DC power input

Power Output:

• VOUT+: Regulated positive DC output

• GND-: Negative DC output

Important Operating Information

• The module is a step-down (buck) converter and cannot increase the input voltage.

• The factory-default output voltage is 5V.

• Changing the output to 3.3V requires soldering the onboard 0Ω resistor to the 3.3V position.

• Additional heat dissipation is recommended when the output current exceeds 3A.

• The maximum specified output current is 4A. Operation up to 5A is only possible under exceptional conditions with sufficient cooling.

• Always verify the output voltage and polarity before connecting sensitive electronic devices.

• Ensure that the connected equipment's power requirements are compatible with the converter's specifications.

Package Contents

1 × Waveshare DC-DC Buck Converter Mini Module (DC5-36-TO-DC3V3-5-M) with pre-soldered pin headers and screw terminals.

Documentation

Wiki Link