The DC1771A is a single output synchronous buck converter featuring the LTC®3867EUF with a 24-lead 4mm × 4mm QFN package. Using the inductor’s DCR as the sense element instead of the on-board sense resistor saves cost and board space while improving full-load efficiency over 2%, though the sense resistor provides a more accurate current limit. The board has a lot of features including an internal 5V linear regulator for bias, output voltage remote sense, programmable nonlinear control to improve load tran- sient performance, programmable thermal shutdown, optional temperature compensated DCR sense circuit, a mode selector that allows the converter to run in CCM, pulse-skipping or Burst Mode® operation. Synchronization to an external clock is also possible. The input voltage range is from 4.5V to 14V. The LTC3867 data sheet gives a complete description of the part, op- eration and application information and must be read in conjunction with this demo manual for DC1771A. Design files for this circuit board are available at http://www.linear.com/demo.