LM63635-Q1: The chip surface is damaged and has sharp edges

guo kang

Part Number: LM63635-Q1

Tool/software:

the broken IC

Hi,

During the DV test, we find a unit broken with a unusual appearance (we have used thousands of this converters and that is the only one case).

We just turned on the power and enabled the LM63635 (12Vdc to 5Vdc) and we found it was broken.

You can see the appearance with a sharp edge, which not likes the molten state or has other abnormal color. and we also finded the lower side MOS （SW to GND）is shorted, and the high side is cutting off.

We have no idea about this situation. Could you please guide me on the analysis approach?

7 months ago

0 Taru Kapoor 7 months ago

TI__Genius 11695 points

Hi Guo Kang,

What is the load at the output during DV?
Please share the schematic.
Do you see any other damage on the board?

Thanks,

Best Regards,

Taru

0 guo kang 7 months ago in reply to Taru Kapoor

Prodigy 30 points

Hi Taru，

The buck converter and its load are on board, and the load is the sensor, almost 5W.

There was no any other device broken.

Thanks!

BUCK converter

0 Taru Kapoor 7 months ago in reply to guo kang

TI__Genius 11695 points

Hi Guo,

Based on a quick schematic review - the basic connections seem fine (although the cap values have been blurred out) - can you share the full unblurred schematic with me?

Was it ensured that the IC was assembled in an ESD safe area?

Thanks,

Best Regards,

Taru

Power management

Power management forum

LM63635-Q1: The chip surface is damaged and has sharp edges