Two bucks, two LDOs — one QFN
The ISL9307IRTAAJBZ-T7A packs two 1.5A synchronous step-down (buck) converters and two 300mA linear (LDO) regulators into a single 16-QFN 4x4mm package — a four-rail power solution for space-constrained boards that need both high-efficiency core rails and quiet analog supplies.
Switching at 3 MHz — smaller inductor, same ripple
The buck converters switch at 3 MHz — high enough to use a 1 µH or 2.2 µH inductor in the 0805 or low-profile 2.0×1.6mm footprint, keeping the total solution height under 1.2 mm on a 4-layer board. The two buck outputs are independently adjustable from 0.8V to 5.5V via external feedback resistors; the two LDOs deliver fixed 2.8V at 300 mA each, suitable for analog front-end or I/O rail noise isolation.
Package and thermal — exposed pad is mandatory
For field rework, a hot-air station with a 4×4 mm nozzle and preheat from the board backside is the reliable swap method; the exposed pad wicks solder and can tombstone if the profile is too aggressive.
Lifecycle and compliance — active, no obsolescence watch
It is ROHS3 compliant, so it clears EU and UKCA material restrictions without an exemption. No reel quantity is stated in the listing — confirm the reel count at RFQ time.