We are using LM20133MH for generating 3.3v from 5v supply in one of our traction control module. The 3.3v is used to power one MVB protocol communication module. The power supply is intended to generate 3.3v and the operating current of 400 to 600 mA.
Failure of components is being observed in these modules at site hence needs to design review.
Failure observed at site and other observation:
1. Modules are burnt in IC (LM20133) location and and its peripherals
2. Only LM20133 burnt
3. In non working modules replacement of A4 makes module good
4. In some modules Input/output Inductors are burnt
5. Few failures are within one year (about 15%)
We are looking for TI support in addressing this failure and arrive at more reliable design.
