Fixed 3.3 V rail, 800 mA — the BOM-fit tier for point-of-load regulation
The TPS62056DGSG4 is a fixed-output step-down buck converter from Texas Instruments, delivering 800 mA at a regulated 3.3 V from an input rail spanning 2.7 V to 10 V.
850 kHz switching — inductor sizing and output ripple
The 850 kHz switching frequency is a middle-ground choice: high enough to keep the inductor in the 4.7 µH to 10 µH range (smaller footprint than a 300 kHz design), but low enough that switching losses in the synchronous FETs don't dominate the dissipation at light load. For a 3.3 V output at 800 mA, the inductor ripple current stays manageable with a standard shielded ferrite.
The wide range also covers cold-crank battery conditions at the low end.