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Forum: µC & Digital Electronics Replacing an unknown DC-DC converter


Author: Martin (Guest)
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Hello,

i got a not working video transmitter from a friend. He used a 12V 
supply, but the part need a 5 V supply. After some measurement i found 
out that the fuse is ok, but there are three dcdc-converter which aren't 
working.
The three parts have each an inductor for filtering there outputs and 
after i desoldered it i could measure that the parts which are supplied 
ok.

Now i only need to replace the parts, but i didn't find the name of the 
IC. It is labeled with : "CB=DG", "81R".
The part has a QFN-16 case with thermal pad.

After i searched a bit and looked at some distributors i didn't find the 
part, has someone an idea what's the name of the part is ?


Regards,
Martin

Author: Easylife (Guest)
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I guess it's a RT8058
http://www.richtek.com/product_detail.jsp?s=285
Cheers.

Author: Easylife (Guest)
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RT8058GQW to be precise.

http://www.rom.by/files/Richtek_Marking_Code.PDF
"CB=" matches, pinout looks good too.

5.5V max. input voltage explains damage at 12V.

Author: Martin (Guest)
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Hello,

thanks for your idea, i think it could be this part.

The marking is not at the datasheet but i contact richtek.


Regards,
Martin

Author: Martin (Guest)
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Hello again,

thanks for the second post, yes this should be right, thank you very 
much.


Regards,
Martin

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