You can read more about it at Step-Down dc-dc Converter Eliminates Ferrite Cores at 50kHz Enabling Power Supply on Chip with One-Cycle Transient Response.
It operates at 50KHz switching frequency, uses 10 nH inductors (PCB loops), and can have very low losses (less than 1%)
Engineering is the art of making what you want from what you can get at a profit.
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