ID SMD chip - Regulator, DC converter?
 

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.

ID SMD chip - Regulator, DC converter?
 

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?

ID SMD chip - Regulator, DC converter?
 

"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.

ID SMD chip - Regulator, DC converter?
 

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.

ID SMD chip - Regulator, DC converter?
 

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

ID SMD chip - Regulator, DC converter?
 

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