Mini SMD step-down converter 1.8A, 3.3V / 5V / adjustable

Product detailed description

Miniature SMD DC-DC step-down converter with an output current of up to 1.8 A, available in fixed 3.3 V and 5 V output versions, or with an adjustable output of 0.8–23 V. With dimensions of approximately 22 × 17.5 mm, it fits into very tight constructions and is suitable for powering ESP32, Arduino, sensors, or LEDs from 12 V or 24 V rails, car batteries, or multi-cell Li-ion batteries. Efficiency of up to 96% ensures minimal heating under normal load; with additional cooling, the converter can handle up to 3 A for short durations.

Specifications:

• Type: DC-DC step-down converter (buck)
• Control circuit: MP1584 clone (chip marking is sanded off)
• Input voltage: 5.3–26 V DC (5 V variant: 6–26 V DC)
• Output current:
  • Continuous: 1.8 A
  • With cooling: up to 3 A
• Efficiency: up to 96%
• Output ripple: max. 30 mV
• Galvanic isolation: no
• Dimensions: approx. 22 × 17.5 × 4.5 mm
• Weight: approx. 4 g
• Variants:
  • 3.3 V: fixed 3.3 V output, 5.3–26 V input
  • 5 V: fixed 5 V output, 6–26 V input
  • Adjustable: 0.8–23 V output adjustable via trimmer, 5.3–26 V input

Important wiring notice:

• Always keep the input voltage at least 2 V higher than the required output voltage.
• Before connecting sensitive electronics (ESP32, displays, sensors), measure the output voltage with a multimeter. For the adjustable version, set the required voltage using the trimmer before applying a load.
• Ensure heat dissipation for currents above approx. 1 A. The heatsink should be attached to the black package of the control circuit (SOIC-8), not to the inductor.
• For loads with high current peaks (e.g. Nextion displays, Wi-Fi modules, servos), we recommend adding a 220–470 µF electrolytic capacitor to the output.
• The converter is not galvanically isolated and has no reverse polarity protection – ensure correct input polarity.

Package contents:

• 1× mini SMD step-down converter (depending on the selected version)

Note:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustrative purposes only and may sometimes differ from the actual appearance of the item. However, this does not change their basic properties.