The Buck Click Board™ is a buck switching regulator that accepts a wide input voltage range of up to 40V and steps it down to 3.3V or 5V. The Click Board™ carries the LT3976 40V, 5A, 2MHz step-down switching regulator with 3.3µA quiescent current.
The Buck Click Board™ communicates with the target microcontroller over the following pins on the MikroBUS line: PWM, INT, RS, CS.