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Author Topic: 8-14V input with regulated 12V output needed  (Read 763 times)
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This would be for a car application, 8-10V when cranking, 12.5V not running, and 13.5ish when running.
I have a sensor that i need to provide a stable 12V with any of those input voltages.
Anybody got any ideas?

i tried a radio-shack 12V TO220 package regulator, but it wants at least 14v input.. it works, but not very well.
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Left Coast, CA (USA)
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At what maximum current output value?

You could use a switching boost regulator to boost to say 15vdc, feeding a switching buck regulator adjusted down to +12dc output.

Lefty



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You would need a sepic or buck/boost switching power supply. Search for them on ebay. They have modules that can power up to 2 Amps.
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http://www.ebay.com/itm/3-5-28V-1-25-26V-DC-DC-Converter-Boost-Buck-Step-Up-Step-Down-Voltage-Module-/250990148807?pt=LH_DefaultDomain_0&hash=item3a702dbcc7#ht_4874wt_1396

this one looks like it will fit the bill.
too bad it's in china. anyone know where to get one of these in the states?

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It's probably actually easier to boost to 16-24V, and then regulate back down to 12V, especially if you don't need a lot of current.
Digi-Key has literally hundreds of different voltage converters that will do the trick.
Try an LM2585 perhaps?
Or a ready-made module for about $5. Something like http://search.digikey.com/us/en/products/VBSD1-S12-S12-SIP/102-1365-ND/989820
Higher-end parts with wider input range: http://search.digikey.com/us/en/products/VWRBS2-D12-S12-SIP/102-1511-ND/1558906
« Last Edit: February 13, 2012, 05:42:17 pm by jwatte » Logged

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