Three buck rails in one 6x6 mm QFN
The TPS65288RHAR from Texas Instruments packs three synchronous buck converters into a single 40-VFQFN package with a 6x6 mm footprint.
Switching frequency and inductor sizing
The 300 kHz to 2.2 MHz switching range gives the designer room to optimise: lower frequencies improve efficiency at light load, while higher frequencies shrink the inductor footprint. The synchronous rectifier keeps the efficiency curve competitive across the load range.
The 18 V input ceiling covers 12 V and 15 V rails cleanly; for 24 V industrial buses a pre-regulator or a higher-voltage part is needed.