The TPS54308DDCT is a 3 A continuous-rated buck converter from Texas Instruments that accepts a 4.5 V to 28 V input rail — wide enough to run from a 12 V or 24 V industrial supply without a pre-regulator, or from a multi-cell Li-ion stack in portable equipment.
Thermal and package — will it survive the oven?
The 3 A output at 350 kHz generates roughly 1.5 W to 2 W of dissipation at high input-to-output differentials — the PCB copper area under the thermal pad must be sized to keep the junction below 125°C. A 2-layer board with a 1-inch-square top-side copper pour is the practical minimum for full-rated current.
Sourcing and lifecycle — no LTB risk
No minimum order quantity is imposed; cut-tape and full-reel options are both available.