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Old 19th January 2012, 11:28 AM   #1
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Default lt 1085 power supply

I need 2 a and 1,5 v and i have 2,9 v input.
how I can make this lt1085 ?

VOUT=1.25(1+R2/R1)is this right v out ?
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Old 19th January 2012, 06:05 PM   #2
luka is offline luka  Slovenia
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yes, that is right... oh and output will be for R2 x Iadj higher, but that is not much

also, you will be able, probably, to get 1.5v out, BUT

Up to 1.5v is dropout voltage, typ is 1.3v
you are cutting it too close, I would use some low dropout regulators
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Old 20th January 2012, 08:04 AM   #3
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would You recomended some circuit ?
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Old 20th January 2012, 09:58 AM   #4
qusp is offline qusp  Australia
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LT1764A will be better suited if you need lower dropout. will do 3A, is lower noise than 1085 as well. excellent regulator and i use it along with its lower current/lower noise brethren LT1963A as a default these days
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