The Texas Instruments TPS630252YFFT is a fixed 3.3 V output buck-boost regulator in a 20-DSBGA package, rated for 3.5 A on the internal switch and switching at 2.5 MHz. The synchronous rectifier keeps efficiency up across the transition region, and the fixed 3.3 V output saves two feedback resistors on the BOM.
2.5 MHz switching — inductor size and ripple trade-off
At 2.5 MHz the switching frequency is high enough to use a small, low-profile inductor — typically 1 µH to 2.2 µH — which keeps the overall converter footprint tight. The trade-off is slightly higher switching losses compared to a 500 kHz part, but for a portable device drawing a few hundred milliamps the inductor volume saved is worth it. The fixed 3.3 V output also means the compensation is internally optimised for that rail, so you don't need to tune external RC networks.
Active lifecycle — still a current-production part
Package note — 20-DSBGA
The 20-DSBGA (0.4 mm pitch, 0.5 mm ball diameter) is a fine-pitch wafer-level package. It requires a well-controlled solder paste print and a reflow profile tuned for the small balls.