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High frequency buck regulators and MLCC frequency behaviour

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Ice-Tea:

--- Quote from: OM222O on April 24, 2019, 09:48:42 pm ---well I really hope you have the heat sinking to deal with the horrific efficiency at those frequencies ... 2.4MHz is insanely huge as I mentioned before, you should expect a lot of output heat. have you done any thermal simulation / testing?

--- End quote ---

I'm not sure why you bring this up... It's an established TI product with efficiencies between 80-90%. It has a nice thermal pad. Connected to a decent GND plane there shouldn't be much trouble.

ocset:
I remember once  measuring output ripple voltage of a 1MHz SMPS, (with ceramic MLCC capacitors) and reported that the ripple voltage was far less when a much lower  output capacitance bank  was used…..(because the ESL of the lower output capacitance bank was lower, since it had lower value ceramic caps in it).
This nearly resulted in me getting sacked, until they were brought to  realise  that the ESL was at play.
(They had mistakenly just assumed that “Higher output capacitance means lower output ripple voltage”, which of course is folly)

justanothername:

--- Quote from: Ice-Tea on April 26, 2019, 07:02:25 am ---I'm not sure why you bring this up... It's an established TI product with efficiencies between 80-90%. It has a nice thermal pad. Connected to a decent GND plane there shouldn't be much trouble.

--- End quote ---

irritating, isn't it?  ;) Not even remotely connected to my question as well..

OM222O:
the voltage controller itself won't be an issue  :P the poor mosfet that has to switch at that frequency will be.
you will require active cooling at 2.4MHz for sure ... unless you're drawing something like 100mA  :palm: as I said before it's switching loss, not conduction loss  :scared: he will realize it sooner or later

magic:
Read the datasheet, dude.

That being said, this part is indeed quite impressive although not really among the craziest things out there.

--- Quote ---Intel's® 4th generation Core™ microprocessors are powered by Fully Integrated Voltage Regulators (FIVR). These 140 MHz multi-phase buck regulators are integrated into the 22nm processor die, and feature up to 80 MHz unity gain bandwidth, non-magnetic package trace inductors and on-die MIM capacitors. FIVRs are highly configurable, allowing them to power a wide range of products from 3W fanless tablets to 300W servers.
--- End quote ---

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