Electrifier XL4016 DC-DC Buck Converter 300W 9A Step-Down Module | Adjustable 5-40V to 1.2-35V output, dual CV/CC trimpots, green CV LED, aluminum heatsinks for LED drivers and bench supplies

The Electrifier XL4016 DC-DC Buck Converter is a high-current step-down module for makers, robotics builders and small-scale R&D work that needs a reliable variable DC supply from a higher-voltage source. Feed it any DC input between 5V and 40V — a 12V SLA battery, a 24V solar panel, a 36V power brick — and set the output anywhere from 1.2V to 35V using the two onboard trimmer potentiometers. Voltage and current limit are adjusted independently, so the same module works as a voltage regulator, a current-limited LED driver, or a controlled charger for lithium and lead-acid cells. At its core is the XL4016 step-down IC running at a fixed 180kHz, paired with a low-loss toroidal inductor and high-frequency filter capacitors. Twin finned aluminum heatsinks draw heat directly off the board, supporting peak figures of up to 9A and 300W. The XL4016 itself is rated around 8A continuous, so for sustained high-power use it is best to stay well below the peak rating and add an external cooling fan; 5V input suits light loads, while 8V or higher is recommended as the load approaches full current. A small green LED indicates constant-voltage mode and dims as the module crosses into constant-current operation, much like a lab bench supply. This makes it well suited to DIY bench power supplies, Li-ion, Li-Po and lead-acid charging circuits, high-power LED arrays, motor and robotics builds, solar charge-controller experiments, automotive 12V conversions and educational electronics labs — essentially any project needing a clean, adjustable DC rail. The module measures roughly 65 x 47 x 20mm and connects through a 4-position screw terminal block; it ships as the module only, without wires, hardware or fan. Every unit is built under ISO-certified manufacturing controls, output-tested for stable performance, and backed by a 1-year warranty with India-based Electrifier seller support.