lt 1085 power supply

kunkku10 · 19th January 2012, 10:28 AM

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 ?

luka · 19th January 2012, 05:05 PM

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

kunkku10 · 20th January 2012, 07:04 AM

would You recomended some circuit ?

qusp · 20th January 2012, 08:58 AM

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

19th January 2012, 10:28 AM	#1
kunkku10 diyAudio Member Join Date: Jan 2012	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 ?

19th January 2012, 05:05 PM	#2
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	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 __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

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20th January 2012, 07:04 AM	#3
kunkku10 diyAudio Member Join Date: Jan 2012	would You recomended some circuit ?

20th January 2012, 08:58 AM	#4
qusp Sometimes a square peg fits a round hole just fine diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	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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