42V input — where it fits and where it doesn't
The 42V maximum input covers 24V industrial rails with margin, 12V automotive systems with load-dump transients, and lightly regulated 48V telecom supplies if you stay under the ceiling. The 3.4V minimum input means it can run from a 5V rail or a 3-cell Li-Ion pack.
Switching frequency — inductor size vs efficiency
The switching frequency spans 200kHz to 3MHz.
Package and thermal — the exposed pad is not optional
The 28-TSSOP exposed pad (EP) package requires a thermal land on the PCB. Solder the pad to a copper plane — the datasheet recommends multiple vias to an inner-layer ground plane. Without that thermal path, the junction temperature rises quickly at 2.5A output. The -40°C to 125°C junction rating is real only if the board pulls heat away. In a sealed enclosure with no airflow, derate the output current or add forced air.
Lifecycle and compliance — no LTB worry
It is ROHS3 compliant, so it meets the current EU restriction directive. The #PBF suffix indicates lead-free (Pb-free) finish. No known successor or second-source alternate from the manufacturer; the part is sole-sourced from Analog Devices.