ISL78226 6-Phase Bidirectional DC/DC Controllers Renesas Electronics ISL78226 6-Phase Bidirectional DC/DC Controllers are designed for automotive power supply systems and perform buck and boost power conversions between 12V and 48V buses. A single automotive-grade ISL78226 delivers up to 3.75kW at >,95% conversion efficiency and can interleave in a modular primary / secondary architecture to deliver higher power. The ISL78226 series regulates both voltage and current to control power transfer from bus to bus. These devices also integrate a dual-output flyback controller that generates both a 12V supply for the power stage FET drivers as well as a 6V supply for the ISL78226 from either of the two buses. A 200mA auxiliary linear regulator is included to supply a local microcontroller or interface devices. A PMBus interface provides system control and diagnostics to support functional safety requirements.