Electronics > Projects, Designs, and Technical Stuff
DC-DC Switching regulator, 12v -> 5v and 3.3v
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thm_w:
https://www.digikey.ca/product-detail/en/recom-power/R-78E3.3-1.0/945-2409-5-ND/5327711 - 12V to 3.3V 1A $4
https://www.digikey.ca/product-detail/en/recom-power/R-78E5.0-1.0/945-2201-ND/4930585 - 12V to 5V 1A $4

technix:
I have been using TPS563200 for a while. That is a single buck chip though, but very little additional components needed.
JaspaJami:

--- Quote from: mariush on November 01, 2018, 08:17:53 pm ---Yeah, so budget doesn't really seem to be a issue.
How about pcb space, are you constrained in some ways? how about vertical height? How important is ease of repairability etc?
Would it be more convenient to go with something that would allow for cheaper single layer pcbs?

For example, you have DIP8 ICs like Sanken NR8887 which would allow you to use through hole regulator, inductor and maybe a couple of electrolytic capacitors on top and then use surface mount ceramics on the bottom , or you could go completely through hole for both voltages.

--- End quote ---
PCP space is not much of an issue but vertical height is. Lets say 10mm from the board starts to be near maximum.

Repair... most likely if problems whole board will be changes (about half price from whole unit bacause display is easy to remove).

PCB is going to be double sided, but thru hole is not problem at all. Anyway board is going to be combination of thru hole and smd:s
JaspaJami:

--- Quote from: thm_w on November 02, 2018, 12:06:16 am ---https://www.digikey.ca/product-detail/en/recom-power/R-78E3.3-1.0/945-2409-5-ND/5327711 - 12V to 3.3V 1A $4
https://www.digikey.ca/product-detail/en/recom-power/R-78E5.0-1.0/945-2201-ND/4930585 - 12V to 5V 1A $4

--- End quote ---
These or this kind of could be interesting. Have to check that they are not too tall, but most likely not.

EDIT: and seems to be similar not so high SMD modules: https://www.digikey.fi/product-detail/en/recom-power/R-78AA3.3-1.0SMD/945-1606-5-ND/2303054
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