Active production, 4 A step-down for 36 V rails
The Texas Instruments LM60440DRPKR is a current-production step-down buck converter delivering 4 A from a 3.8 V to 36 V input rail — a single-chip solution for 12 V, 24 V, or intermediate bus architectures where the load pulls up to 4 A and the output needs to be set anywhere from 1 V to 24 V.
What the 150°C junction rating means for the thermal budget
The operating junction temperature range spans -40°C to 150°C, which is the full automotive-grade envelope — the part can sit next to a hot power stage or in an enclosure that sees 85°C ambient and still have 65°C of headroom before hitting the absolute maximum.
Package and board-fit: wettable-flank WQFN
The 13-PowerWFQFN package (3 mm × 2 mm, 0.5 mm pitch) uses a wettable-flank terminal finish — the side of each pad is plated so that an AOI system can verify solder-joint wetting after reflow, which is a requirement for automotive and high-reliability assemblies where hidden QFN joints are otherwise invisible.
Sourcing and compliance
The device is ROHS3 Compliant, meaning it meets the EU RoHS directive with no exemptions for lead in solder or other restricted substances — no additional documentation is needed for CE-marked equipment shipped into the European market.