The Buck-Boost 3 Click Board™ is a voltage converter/regulator, which is able to provide a regulated voltage of 3.3V or 5V on the output, even when the input voltage drops under 3V. This is possible thanks to the ISL85403, a specialised buck-boost voltage converter IC which features an integrated high-side MOSFET and a low-side driver, that can be used to drive an external MOSFET.
Buck-Boost 3 Click Board™ perfectly suited to provide power with regulated voltage for embedded applications, points of load, or to be used as the battery voltage regulator, or in similar general-purpose power applications that require regulated 3.3V or 5V power supply.