The TPS55289RYQR: Input voltage range is 3 V to 30 V. Output adjustable down to 0.8 V with synchronous rectification. Switching frequency programmable from 200 kHz to 2.2 MHz.
21-VQFN-HR (3x5) — footprint and thermal reality
The TPS55289RYQR is supplied in a 21-PowerVFQFN package, supplier device package 21-VQFN-HR measuring 3 mm x 5 mm. That is a compact land pattern for a 6.35 A switch, so the thermal pad and the via stitch under the package are not optional — they are part of the rated dissipation path. If you are hand-prototyping, the Cut Tape variant is the one to order.