Buck-Boost Converter Board SparkFun

This converter can take an input voltage of anywhere from 3-16V which can then be regulated to an output voltage between 2.5-9V. With the switch on the bottom of the board, you can set the common output voltages of 3.3V and 5V. n addition to the voltage control, the SparkFun Buck-Boost Converter uses a switching DC/DC converter, which is more efficient than a linear regulator. More efficiency means less energy is wasted in the form of heat. With built-in overtemperature protection and an optional heatsink, you can achieve up to 95% efficiency rating.