Step-Down DC-DC converter power supply 0.8-17.5V 3A buck MINI 1×2cm

Compact DC-DC Step-Down voltage converter for Arduino, ESP8266, ESP32, Raspberry Pi

DC-DC Step-Down voltage converter is a miniature module with a wide range of applications. With an input voltage of 4 V to 18 V, the device offers smoothly adjustable output voltage from 0.85 V to 17.5 V via the built-in potentiometer. The module also allows a fixed output voltage to be set by soldering the appropriate jumper on the back of the PCB.

The device features a constant output current of 2.1 A and high efficiency up to 95%. Thanks to its small size (20 x 10 x 5 mm), the converter is ideal for powering a variety of electronic projects and prototypes.

Key technical specifications

• Input voltage: 4 - 18 V
• Output voltage: 0.85 - 17.5 V (adjustable with potentiometer or fixed after soldering the jumper)
• Continuous output current: 2.1 A
• Efficiency: ~ 95%
• Dimensions: 20 x 10 x 5 mm

Pinout and connection

Correct connection of the converter requires understanding the markings on the PCB. Make sure the input voltage is within the supported range and that the connected device does not exceed the maximum output current.

• IN+ - positive voltage input (power supply plus).
• GND - circuit ground (power supply minus), common reference for input and output.
• VO+ - positive stepped-down voltage output (powered device plus).
• EN - control pin (Enable). Leaving it unconnected or tying it to IN+ enables the converter. Connecting a switch allows manual control of the module.

Example applications

• Powering logic circuits and microcontrollers (ESP8266, ESP32, Arduino, Raspberry Pi).
• Stepping down voltage in battery and accumulator power systems.
• Powering communication modules and sensors that require lower voltages.
• Building miniature power supplies integrated into portable devices.
• DIY projects and prototyping electronic circuits with limited mounting space.

Benefits

• High flexibility - choice between smooth adjustment and fixed output voltage.
• Compact size - easy integration even in very small enclosures.
• High energy efficiency - lower heat losses and longer runtime on battery power.
• Simple mounting and use - clear pin labels for correct wiring.
• Versatility - wide input and output voltage range suited to many power standards.