Please help to identify this IC

[cozza]

Hello, I am repairing a RGB drive board from an LED lighting fixture, and would like some help identifying a chip.

The device is marked AJF BAC and has 16 pins, it appears to be a buck converter.  There are three identical channels driven by a MAX5715 4 channel DAC. The green channel is stuck on at medium intensity, and changes by one or two steps only.

The back side of the board has three power mosfets, 3 high current diodes and three large inductors.

I haven't had any success finding a part number for the device.

Thank you for any assistance!

[fzabkar]

Maybe MAX4783ETE?

https://www.analog.com/media/en/technical-documentation/data-sheets/max4781-max4783.pdf (datasheet)

https://www.ebay.com/itm/392508211438 (photo)

[ArdWar]

That's a fancy LED driver.

Three digit Axx is definitely Maxim topmark format, so I guess you can start there.
There used to be topmark database on their old website before ADI merger, but it appears to be gone now. Unfortunately they also stop listing topmark on their datasheet a while ago.

Maybe MAX4783ETE?

Nah, first line is the part number.

[cozza]

Update : I've done some more diagnostic work and swapped two of the buck converters (blue and green)- no change so the part is not faulty.
Look like a control issue which need further investigation.

[fzabkar]

This database has several Maxim parts with an "AJF" marking, but all are in the wrong package.

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

My previous guess was wrong:

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