The MAX20098 is an automotive 2.2MHz synchronous step-down controller IC with 3.5µA IQ. This IC operates with an input-voltage supply from 3.5V to 42V and can operate in dropout condition by running at 99% (typ) duty cycle. It is intended for applications with mid- to high- power requirements that operate at a wide input voltage range such as during automotive cold-crank or engine stop-start conditions. The step-down controller operates at up to 2.2MHz frequency to allow small external components, reduced output ripple, and to guarantee no AM band interference. The switching frequency is resistor adjustable (220kHz to 2.2MHz). FSYNC input programmability enables three frequency modes for optimized performance: forced fixedfrequency operation, skip mode with ultra-low quiescent current, and synchronization to an external clock. The IC also provides a SYNC output to enable two controllers to operate in parallel. The IC has a factory-programmable spread-spectrum option for frequency modulation to minimize EMI interference. The PGOOD output indicates when the voltage is within regulation range. Protection features include cycle-by- cycle current limit and thermal shutdown. The MAX20098 is specified for operation over the -40°C to +125°C auto- motive temperature range.