LT8708x 4-Switch Buck-Boost Controllers Analog Devices LT8708x 4-Switch Buck-Boost Controllers are designed to operate from an input voltage that can be above, below, or equal to the output voltage. These controllers use the four resistors on the PCB to independently set the forward input, reverse input, forward output, and reverse output. The LT8708x controllers feature synchronous rectification, 80V bi-directional capability, six independent forms of regulation, and forward and reverse discontinuous conduction modes.