ISL91107IR Buck-Boost Regulator Renesas / Intersil ISL91107IR Buck-Boost Regulator with 4.1A Switches accepts input voltages either above or below the regulated output voltage. This The highly efficient regulator automatically transitions between operating modes without significant output disturbance. ISL91107IR is capable of delivering up to 2A of output current and provides excellent efficiency due to its fully synchronous 4-switch architecture.