This is the sweet spot for a single-cell Li-Ion battery (3.0 V to 4.2 V) needing a regulated 3.3 V rail, or for a 5 V bus that must hold regulation when the input dips below 5 V. The 2.5 MHz switching frequency keeps the inductor in the 1 µH to 2.2 µH range, which fits the 12-VQFN-HR (2.5x2.5 mm) footprint without forcing a tall external component.
Synchronous rectification and adjustable output — no Schottky, one resistor divider
The output is adjustable via a single resistor divider from 2.5 V up to 5.5 V. The positive output configuration and single-channel design make it a drop-in for point-of-load rails that must stay regulated through both step-up and step-down transitions.