MAX20034 Dual Buck Controllers Analog Devices MAX20034 Dual Buck Controllers are automotive 2.2MHz devices that provide two high-voltage, synchronous step-down controllers. The controllers operate at 180° out-of-phase. The IC operates with a 3.5V to 42V input-voltage supply and can function in dropout conditions by running at a 99% duty cycle. It's intended for applications with mid- to high-power requirements that perform at a wide input voltage range. This includes during automotive cold crank or engine stop-start conditions.