ID SMD chip - Regulator, DC converter?

G

Gareth Magennis

Guest
Hi,

trying to ID an 8-pin SMD.
The circuits function is to supply 2.5v, probably to the D/A converters.
It has 2 diodes, 3 caps, a resistor and inductor around it.
I don't know if either of the diodes are a zener.

Markings: LTZJ and 4E32



Any pointers appreciated,


Gareth.
 
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:3-ednTZWBM8E8F3MnZ2dnUVZ7rWdnZ2d@bt.com...
Hi,

trying to ID an 8-pin SMD.
The circuits function is to supply 2.5v, probably to the D/A converters.
It has 2 diodes, 3 caps, a resistor and inductor around it.
I don't know if either of the diodes are a zener.

Markings: LTZJ and 4E32



Any pointers appreciated,


Gareth.
Click to expand...
Linear Technology 2.5V precision reference?
 
"N_Cook" wrote in message news:kprmct$gkp$1@dont-email.me...

Gareth Magennis <sound.service@btconnect.com> wrote in message
news:3-ednTZWBM8E8F3MnZ2dnUVZ7rWdnZ2d@bt.com...
Hi,

trying to ID an 8-pin SMD.
The circuits function is to supply 2.5v, probably to the D/A converters.
It has 2 diodes, 3 caps, a resistor and inductor around it.
I don't know if either of the diodes are a zener.

Markings: LTZJ and 4E32



Any pointers appreciated,


Gareth.
Click to expand...
Linear Technology 2.5V precision reference?





I think you've right there, probably something like this on initial
Googling:

http://www.linear.com/product/LTZ1000



Thanks!



Gareth.



Gareth.
 
Or more likely one of these, but I can't get any of my package markings to
match up with any of theirs.

http://uk.farnell.com/jsp/search/browse.jsp?N=203961+100053+110018196+110177238&No=0&getResults=true&appliedparametrics=true&locale=en_UK&divisionLocale=en_UK&catalogId=&skipManufacturer=false&skipParametricAttributeId=&prevNValues=203961+100053+110018196+110154740&filtersHidden=false&appliedHidden=false&autoApply=false&mm=1001611||,1001758||,&originalQueryURL=%2Fjsp%2Fsearch%2Fbrowse.jsp%3FN%3D203961%26No%3D0%26getResults%3Dtrue%26appliedparametrics%3Dtrue%26locale%3Den_UK%26divisionLocale%3Den_UK%26catalogId%3D%26skipManufacturer%3Dfalse%26skipParametricAttributeId%3D%26prevNValues%3D203961



Which may now be a moot point, as the problem seems to be 12v coming from
the circuitry that is meant to be supplied the 2.5v from this regulator.

Something is very dead.



Gareth.
 
LT1767EMS8E-2.5, Monolithic 1.5A, 1.25MHz Step-Down Switching Regulator:
http://www.jameco.com/Jameco/Products/ProdDS/1740748.pdf
http://cds.linear.com/docs/jp/datasheet/j1767f.pdf
 
Hi Franc,

sorry for the delay, I've been away, but that is indeed the chip, thanks
very much.

I will have another look at the PCB tomorrow.



Cheers,


Gareth.








"Franc Zabkar" wrote in message
news:137e8a09-76a7-41e1-8134-b85717f7c49b@googlegroups.com...

LT1767EMS8E-2.5, Monolithic 1.5A, 1.25MHz Step-Down Switching Regulator:
http://www.jameco.com/Jameco/Products/ProdDS/1740748.pdf
http://cds.linear.com/docs/jp/datasheet/j1767f.pdf
 
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