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LM5022: PIN6 to PIN7 Short circuit

user6062940
Intellectual 610 points
Part Number: LM5022

Dear Ti ,

1. Attached is the relevant schematic diagram. Please help to see what causes the short circuit of Pin6 to Pin7.We produced a small batch of 3000 with 50 faulty chips. In Schematic diagram Pin3 empty.

2.We did a decape analysis.They found LM3430A inside.Is this normal?Is not consistent between different batches of chips?

Schematic diagram

新建 DOC 文档.doc

  • 0
    TI__Guru* 78400 points

    Hello,

    Could you show the entire die picture?  The portion of the die picture shows the bond pad damage, which is usually a sign of over voltage but we need to be sure.  In your schematic you also have a 3.9V Zener placed from the EN node and GND.  Is the Zener intact or also damaged?

    Regarding the internal labeling, the LM3430A may be possibly the original part number during the development phase but it was re-assigned to be LM5022 when finally released to market. It should not be a concern here. 

    Thanks,

    Youhao Xi, Applications Engineering

  • 0 in reply to Youhao Xi
    TI__Guru* 78400 points

    Hello,

    May I assume the issue is solved so I can close this thread?  You are welcome to re-open it by adding a new post.

    Thanks,

    Youhao