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Two small black rectangular circuit boards with blue potentiometers and green LED indicators, 43 by 21 by 14 millimetres each

BUCIER

BUCIER LM2596-3A-2 DC-DC Buck Converter Power Adapter 2pcs

SKU CH-K57A-K8DPS

Adjustable step-down module converts 3 V–35 V input to 1.25 V–35 V at up to 3 A with 92 % efficiency, supplied as a pair

  • ColorBlack
  • Weight1.58 ounces
  • Adjustable output from 1.25V to 35V covers diverse voltage needs
  • High 92% peak efficiency reduces wasted power and heat
  • Two connection methods — solder or welding pin — suit different assembly styles
  • Compact 43 x 21 x 14 mm module fits tight enclosures
  • LED indicator gives instant visual confirmation of power status

BUCIER LM2596 Buck Converter Pair

This pack contains two LM2596S-based step-down modules that accept a DC input from 3V to 35V and provide a continuously adjustable output from 1.25V to 35V at up to 3A. Each board measures 43 by 21 by 14mm and uses a 36u thickened PCB with a high-Q power inductor, Sanyo solid-state capacitors and an LED indicator. The factory preset is approximately 18V, adjustable counterclockwise roughly 1V per turn.

Suits hobbyists and engineers building custom

Makers who need a compact, adjustable buck regulator for Arduino, Raspberry Pi or sensor projects will appreciate the solder and pin-header connection options. Designs requiring boost or buck-boost operation, isolated outputs, or sustained currents above 2.5A without added heatsinking should look elsewhere. The modules operate from -45 to +85 degrees Celsius with a maximum efficiency of 92 percent and output ripple below 30mV.

3A maximum output current

The single specification that decides fit is the 3A peak current rating, with a recommended continuous limit of 2.5A and a heatsink advised above 2A or 10W output. Input voltage must exceed the desired output by at least 1.5V, and the switching frequency is fixed at 65KHz. Reverse polarity will damage the module, so verify wiring before applying power.

Highlights

  • Adjustable output from 1.25V to 35V covers diverse voltage needs
  • High 92% peak efficiency reduces wasted power and heat
  • Two connection methods — solder or welding pin — suit different assembly styles
  • Compact 43 x 21 x 14 mm module fits tight enclosures
  • LED indicator gives instant visual confirmation of power status

Specifications

BrandMaxmoral
ModelLM2596-3A-2
Part NumberLM2596-3A-2
ColorBlack
Weight1.58 ounces

Questions about this item

What input voltage source do I need to power the LM2596-3A-2 buck converter?

You need a DC source between 3 V and 35 V that is at least 1.5 V higher than your desired output; the module cannot boost voltage.

Can I run the converter continuously at the full 3 A rating with my existing load?

The supplier recommends staying within 2.5 A for long-term use and adding a heat sink whenever the output exceeds 2 A or 10 W.

How do I verify the output voltage is set correctly after wiring the module?

Measure the output with a multimeter; the factory default is approximately 18 V and each full counter-clockwise turn of the potentiometer drops the voltage by roughly 1 V.

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