It can operate in dropout by turning on the integrated 300mΩ high-side FET for the duration of cold-crank or start/stop events.
The wide input supply range, combined with an ultra-low quiescent current (45µA, no load), makes the MAX16975 ideal for automotive applications that have tight power budgets.
The MAX16975 features a resistor-programmable switching frequency (220kHz to 1MHz) that can be tuned to suit the demands of the application. It can also be synchronized to an external clock.Additional features include an open-drain power-good output with adjustable reset threshold and delay timer, as well as protection features such as cycle-by-cycle current limiting, thermal shutdown, and overvoltage protection.
The MAX16975 is AEC-Q100 (Grade 1) qualified and fully specified over the -40ºC to +125ºC automotive temperature range; it is packaged in a thermally enhanced, 16-pin QSOP. Pricing starts at $2.36 (1000-up, FOB USA).