Wide-input buck for 12 V to 48 V rails
The Texas Instruments LMR36510FADDAR is a SIMPLE SWITCHER® synchronous step-down regulator that takes a 4.2 V to 65 V input and delivers an adjustable output from 1 V up to 61.75 V at 1 A. The 400 kHz fixed switching frequency keeps the inductor in the 10 µH to 47 µH range, balancing ripple and component size.
Synchronous rectifier saves a diode
The built-in synchronous rectifier eliminates the external Schottky catch diode that a non-synchronous buck would need. That saves about 0.5 V of forward drop at 1 A and removes one component from the BOM. The trade-off is that the low-side FET stays on during light load, so efficiency at sub-10 mA loads is lower than a diode-rectified part — plan for a preload or pulse-skip mode if the design spends time in standby.
125 °C junction — industrial, not 150 °C automotive
It is not rated for 150 °C junction like some AEC-Q100 automotive parts (e.g., the LMS3655MQURNLRQ1), so if the ambient around the regulator exceeds 105 °C with 1 A load, the thermal margin narrows. The 8-SO PowerPad package needs a solid via stitch to the ground plane to keep the junction below 125 °C at full load.