Mikroe UPS 3 Click represents a bidirectional active charge/balancing solution, and features the Analog Devices LTC3110. The LTC3110 is a bidirectional buck-boost DC/DC regulator/charger combination with selectable operation modes for charging and system backup. It can autonomously transition from Charge to Backup mode or switch modes based on an external command. A proprietary low noise switching algorithm optimizes efficiency with capacitor/battery voltages above, below, or equal to the system output voltage. Additional features include voltage supervisors for direction control and end of a charge and a general-purpose comparator with open-collector output for interfacing with MCU.