42 V input, 3.5 A output — the rail design decision
The LT8610ABIMSE#TRPBF is a step-down (buck) regulator from Analog Devices, delivering up to 3.5 A from a 3.4 V to 42 V input rail. That 42 V ceiling covers 24 V industrial buses with margin for transients and 12 V automotive systems during load-dump events — the internal switch handles the surge without an external clamp. Output is adjustable from 0.97 V up to 42 V, and the synchronous rectifier eliminates the external Schottky diode, keeping the BOM count low for a point-of-load rail on a mixed-voltage board.
Switching frequency and thermal envelope
The switching frequency is programmable from 200 kHz to 2.2 MHz via a single resistor. A higher frequency shrinks the inductor and capacitor footprint — useful when board area is tight — but increases switching losses.
The tape-and-reel suffix (#TRPBF) means it ships on 13-inch reels for automated pick-and-place; cut-tape quantities are also available for prototyping or low-volume builds.