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 wrote in message
...
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.



Linear Technology 2.5V precision reference?

"N_Cook" wrote in message ...

Gareth Magennis wrote in message
...
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.



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=e n_UK&divisionLocale=en_UK&catalogId=&skipManufactu rer=false&skipParametricAttributeId=&prevNValues=2 03961+100053+110018196+110154740&filtersHidden=fal se&appliedHidden=false&autoApply=false&mm=1001611| |,1001758||,&originalQueryURL=%2Fjsp%2Fsearch%2Fbr owse.jsp%3FN%3D203961%26No%3D0%26getResults%3Dtrue %26appliedparametrics%3Dtrue%26locale%3Den_UK%26di visionLocale%3Den_UK%26catalogId%3D%26skipManufact urer%3Dfalse%26skipParametricAttributeId%3D%26prev NValues%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/Product...DS/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
...

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