What this part is — and where it fits
The Maxim Integrated MAX16946GTE/V+ is an adjustable LDO/switch regulator from the Automotive, AEC-Q100, R²Coupler™ series, designed for automotive systems and remote power applications. It operates from a 4.5V to 18V supply, draws 2.1mA quiescent current, and is rated over -40°C to 105°C — the industrial/automotive cabin temperature grade, not full under-hood 125°C. Packaged in a 16-WQFN Exposed Pad (16-TQFN 4x4mm), it is surface-mount and AEC-Q100 qualified, making it suitable for ECU power management, sensor supply, and always-on modules where the thermal profile stays below 105°C ambient.
AEC-Q100 qualification — what it means for your BOM
The MAX16946GTE/V+ carries AEC-Q100 qualification, which means it has passed the automotive stress tests for temperature cycling, ESD, latch-up, and extended life. This is the baseline for any tier-one ECU program — without it, the part doesn't get into the PPAP package. The -40°C to 105°C operating range covers cabin and chassis-mount locations but not engine-bay or exhaust-adjacent spots where 125°C or 150°C grades are required. If your thermal analysis shows junction temperatures exceeding 105°C, you need a different grade.
Supply voltage and current — sizing the rail
The 4.5V to 18V input range covers automotive battery voltage from cold-crank (down to ~4.5V) through load-dump transients up to 18V. The 2.1mA supply current is the quiescent draw — relevant for always-on modules where standby power is budgeted.
Package and mounting — board-level fit
The 16-WQFN Exposed Pad with supplier device package 16-TQFN (4x4mm) is a standard QFN footprint. The exposed pad must be soldered to a thermal via array on the PCB ground plane to dissipate heat — without that, the junction temperature rises quickly under load. Surface-mount only; no through-hole variant exists. The part ships in Tube, not tape-and-reel, so plan for pick-and-place feeder changeover if your line is set up for reels.
Lifecycle and sourcing reality
ROHS3 compliant. No LTB risk, no forced redesign.