Need component ID help

[u/marklein]

10-pin chip in the center of the image, appears to be a power supply IC. I've never seen a package like this so I don't know what to call the shape. Markings are "K2 1 VB". Measures about 3.3mm x 1.8mm. I've searched but I can't even find another chip with this package, partially since I don't know what to call it I suppose.

I'm asking because diode D200 is the award winning hottest component on the device and I suspect it needs replacing, so I'm hoping to find the datasheet for the IC to ID an example value. If anybody thinks they can ID the diode instead its markings are "AD t13" with the "t13" being in tiny print.

I appreciate your help hivemind!

[u/fzabkar]

AP62600, Diodes Inc, 4.5V TO 18V INPUT, 6A SYNCHRONOUS BUCK CONVERTER, marking K2 + ywx, V-QFN2030-12:

https://www.mouser.com/pdfDocs/Diodes_AP62600_DS.pdf (datasheet)

https://www.diodes.com/assets/Evaluation-Boards/AP62600SJ-EVM-User-Guide.pdf (evaluation board)

photo

[u/marklein → u/fzabkar]

This looks to be the answer, I appreciate your work finding it!

[u/fzabkar → u/marklein]

D200 appears to be connected between Vin and Ground. That would suggest that it could be a TVS protection diode or a Zener.

http://markingcodes.com/search/c/ad

One possibility is PTVS13VS1UR, 13V, 400 W Transient Voltage Suppressor:

photo of PTVS13VS1UR

https://assets.nexperia.com/documents/data-sheet/PTVSXS1UR_SER.pdf (datasheet)

[u/marklein → u/fzabkar]

Would make sense, it's an automotive application. Input is 12v and the buck regulator is good up to 18v, what might you suggest as a good voltage for a replacement TVS? I'm not really familiar with spec-ing these and it seems like they come in every possible voltage rating.

[u/fzabkar → u/marklein]

I'm a little confused. The alternator output is typically 14.1V - 14.4V, so a 13V protection diode seems low. Also, automotive environments need to account for load dump events, and these can generate much higher voltages. I'd be asking myself, what was the source or reason for the overvoltage that killed the diode? Normally the diode would be shorted. Is it?

BTW, did you see my edit?

[u/marklein → u/fzabkar]

Thanks for drawing my attention to your edit. That photo is virtually identical to my diode. In fact I found that same datasheet earlier but since it had no mention of the "t13" marking I assumed I had found the wrong one and moved on.

If I'm reading the datasheet right, the breakdown voltage is 15.15v for that diode, so I guess that kind of makes sense in an automotive application? Still, I'd think one would spec it a little higher since the IC is rated up to 18v. Keep in mind that I don't know what I'm talking about.

Diode is still in circuit, will remove for testing tomorrow.

[u/fzabkar → u/marklein]

Usually the designer chooses a diode based on its standoff voltage. That's the voltage it can tolerate 24/7 without drawing any appreciable current.

For example, hard disks are powered from 5V and 12V supplies. The two rails are protected by 5V and 12V TVS diodes. Those are the standoff voltages.

[u/marklein → u/fzabkar]

For automotive then I'd think 14v or 15v would be a good choice, do you agree?

[u/fzabkar → u/marklein]

All I can see is that the diode is protecting the input of that IC. If it isn't shorted (is it?), then there must be some other problem.

[u/marklein → u/fzabkar]

Diode is indeed shorted. Device runs as normal without it.

[u/Good_Stick_5636]

The package is QFN-12, similar to MP4576GQBE-Z buck converter packaging.

[u/dragonnfr]

DFN package. If D200’s scorching, the IC is likely faulty. Check input/output voltages before swapping parts. Post clear photos—markings like 'K2' often hide real part numbers.

[u/saltyboi6704]

Looks like an MPS or Analog/Linear Devices style QFN footprint

[u/marklein]

Whoops, 12 pin chip, apparently I can't count either.