60 V input ceiling, 100 mA output — the industrial bias rail regulator
The LT8618IDDB#TRMPBF is a step-down buck regulator from Analog Devices that takes a 3.4 V to 60 V input and delivers a regulated adjustable output down to 0.778 V at 100 mA. Switching frequency is programmable from 200 kHz to 2.2 MHz via a single resistor. At the low end the efficiency peaks because switching losses drop; at the high end the inductor shrinks to a 0603 or 0805 footprint.
Package and thermal — 10-DFN with exposed pad
A 4-layer board with a solid thermal via array under the DFN keeps the junction below the derating threshold. The package is supplied on tape and reel (cut tape option available), standard for pick-and-place. The 0.5 mm pitch and 3 mm × 2 mm body mean the layout is straightforward — two inner signal layers can fan out without micro-vias.