Rooting around in the fascinating stuff at the bottom of a draw labelled 'Engineering - Junk Miscellaneous'. Delving amongst the delightful...
An Engineer in Wonderland – ridiculous switching frequencies
I can remember talking to a TDK ferrite guy in Japan once and seeing a look of how-are-we-going-to-make-that-inductor shock on his face when I said there was a dc-dc chip available that operated at 2MHz.
I was reminded of this when I read that Semtech has just announced something called the SC202, a 3.5MHz switching regulator whose efficiency peaks at 94%.
Clearly someone has got to grips with ferrites for these high frequencies.
More impressive is that the that whole thing, including inductor, is only 2.5x3x1mm – with a circuit footprint of 14mm2.
Just for completeness: input voltage is 2.9 to 5.5V and it has 15 pin-programmable output voltages between 0.8V and 3.3V.
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I will keep it that way for as long as possible.