Wide-input buck for industrial and automotive rails
The MAX17543ATP+T is an Analog Devices Himalaya series step-down (buck) switching regulator delivering up to 2.5A continuous output from a 4.5V to 42V input range. The output is adjustable from 0.9V up to 37.8V, making it a flexible choice for generating intermediate bus voltages or point-of-load rails in systems that must handle 12V, 24V, or 48V nominal supplies with transients. Integrated synchronous rectification keeps the external BOM to an inductor and a few capacitors — no external catch diode needed. The 20-pin TQFN (4x4 mm) package with exposed pad helps pull heat into the board plane.
What the 4.5V to 42V input range means for your rail
The 4.5V minimum input means this part will start cleanly from a 5V rail with margin, and the 42V maximum covers 24V industrial buses with headroom for transients up to 40V. For automotive designs on a 12V battery line, cold-crank dips to 6V are still above the undervoltage lockout threshold. The 2.5A output is a practical ceiling for powering FPGAs, sensor clusters, or communication modules from a single converter. The adjustable output down to 0.9V suits modern low-voltage cores, while the 37.8V upper limit allows generating a 24V auxiliary rail from a 48V supply.
Rework and package notes
The part is RoHS3 compliant, so no lead-free process conflict. Orientation is marked by a pin-1 dot on the top surface; the datasheet should be consulted for the exact pad layout, but the package outline is standard for 20-lead TQFN.