LTC1871 100W DC-DC Boost Converter Module – 3–35V In, 3.5–35V Out, 6A, Digital Display

The LTC1871-100W is a high-power, adjustable DC-DC boost (step-up) converter module built around the Linear Technology (now Analog Devices) LTC1871 current-mode boost controller with an external N-channel power MOSFET. It is designed to step up a DC input voltage of 3V to 35V to a regulated output of 3.5V to 35V, with a maximum continuous output current of 6A and a rated output power of 75W—rising to approximately 128W when both input and output voltages exceed 20V.

The module uses a no-RSENSE current-mode architecture, which eliminates the need for a discrete current-sensing resistor and maximizes conversion efficiency. The stated peak efficiency is 96.7% (96.4% per the LTC1871 datasheet), and the typical output ripple is only 24mV, making the module suitable for sensitive electronic loads. An onboard digital voltmeter with a 4–40V measurement range and ±0.1V accuracy displays either the input or output voltage, selectable via an onboard button; the display includes an "IN" indicator for input voltage and an "OUT" indicator for output voltage. The voltmeter also features an automatic calibration function that allows fine adjustment of the displayed voltage to match a reference meter.

Output voltage is adjusted via an onboard multi-turn potentiometer (trimmer), which can be turned with a small flat-head screwdriver to set the desired output level. A heatsink is pre-installed on the power stage, and an LED work indicator shows when the module is operating. Protection features include short-circuit protection (current limiting at 14A) and, per the Persian description on the source page, input reverse-connection protection—though the English feature list on the same page states "input reverse connection protection: none" (see QC report). The module measures 67 × 43 × 12 mm (excluding mounting pillars) and weighs approximately 30g (estimated, not specified in source).

The LTC1871-100W is intended for DIY adjustable power supplies, battery-powered systems, laptop/car power adapters, solar projects, and general-purpose voltage step-up applications. It is a complete boost converter module—it does not include a mains adapter, battery, or enclosure.