3.3V to 12V Converter

[airman00]

Hello Everyone

I need to convert the 3.3V supply of the FT232R UART chip to a 12V supply .

I think I *may* have found the solution but would appreciate if someone can verify this for me.
Use the 2920A Regulator - http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=576-1750-5-ND
Heres the datasheet - http://www.micrel.com/_PDF/mic2920.pdf

According to the datasheet(well my interpretation of it) it can take anything between 2 and 26V and output 12V . So if I give it the 3.3V it will be fine and output my 12V

[szhang]

wait, unless i'm completely wrong, linear regulators don't do step up voltage regulation.  I think you need something like a MAX232.

[Steel_monkey]

Linear regulator will not convert 3.3V to 12.
Here is what you need (simple step-up) http://www.nomad.ee/micros/mc34063a/
There are comercially available assembled step-ups ( with everything already in one package ), and they cost approximately 3-5 $.

[Trumpkin]

Linear regulators STEP DOWN voltage by turning the excess voltage into heat.

[airman00]

What about this one: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=LT1109CS8-12%23PBF-ND

Datasheet :http://www.linear.com/pc/downloadDocument.do?navId=H0,C3,P1363,D2533

[Trumpkin]

That should work.

[Admin]

3.3V supply of the FT232R UART chip to a 12V supply

If you look at the datasheet, you'll see that the output current on the 3.3V line is pathetic. If you boost the voltage, and not even factoring in inefficiencies, the current will drop even further.

Basically, check current limitations . . .