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LMR36503: IC burn-off problem

Part Number: LMR36503
Other Parts Discussed in Thread: LMR33620

To whom it may concern

In a design I use the LMR36503MSC3R (2.1MHz) to generate a 3.3V supply from a 18 - 30V input supply

I experience the IC burns off randomly when the input supply is applied and I can't figure out what the reason are.

The maximum load on the 3.3 supply is 150 - 200mA
The application circuit is shown in the attached file.

As I am stuck in the debugging, can anyone comment what I should look for in order to check what the root cause might be?

I have seen a similar problem with a LMR33620CQ IC which I have entered in another thread

Looking forward to hearing any comments

Regards

Henrik