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Recommendations for small boost PSU - 9V to 33V @ 40mA
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mariush:
If you can guarantee input voltage below 10v, you have MIC2299 or MIC2290
MIC2601 or MIC2605 will do up to 20v input, up to 40v output , 1.2 Mhz switching frequency ... MIC2606 if you feel you need 2 Mhz sw. freq.

Psi:
Thanks guys!
soldar:
Maybe you can use something commercially made
https://www.ebay.com/itm/302508247809
thinkfat:

--- Quote from: soldar on June 15, 2019, 07:35:17 am ---Maybe you can use something commercially made
https://www.ebay.com/itm/302508247809

--- End quote ---
But not those. Mostly because you cannot be sure if they actually meet the claimed spec, or if they are made of genuine parts. Also, waaay too big. Switching frequency likely 200khz to 400khz only.

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ocset:
try linear.com or monolithic power systems
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