3 MHz switching buys a small inductor
The TPS62238DRYR is a Texas Instruments step-down buck converter switching at 3 MHz. The fixed 2.25 V output is set internally; no external feedback divider is needed.
500 mA continuous with synchronous rectification
The input voltage range spans 2.05 V to 6 V, so it can run from a single Li-ion cell or a 3.3 V / 5 V rail.
6-SON package — layout and rework considerations
Housed in a 6-pin SON package (1.45 mm x 1.0 mm body, 0.5 mm pitch), this is a small, no-lead package. For rework, a hot-air profile with a preheat zone below 150°C and a peak around 260°C works; the small pad area means the part lifts quickly once the solder reflows.