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LM2831: how to co-layout between TI LM2831 and ST1S06A

Jin Lin
Intellectual 780 points
Part Number: LM2831

Hi TI expert,

My customer original designed ST1S06A for their project, we proposed our solution --- LM2831 but not p2p compatible.

May I know can we co-layout with ST1S06A? It's very import for us that can convince our customer to implement our solution in their next build.

Jin

  

  • 0
    TI__Guru**** 191445 points
    Jin,

    If you are using the LM2831 WSON package, the only pin difference is pin 6. It is the EN pin for LM2831 and NC for ST1S06A. There is a larger more fundamental difference. LM2831 is a non-synchronous converter and requires a catch diode, while the ST1S06A is a synchronous converter with an integrated LS FET. The EN pin must not be left floating. It can be tied to VIN or a suitable logic control. You will also have to provide a footprint location for the catch diode on the PCB that will not be populated for ST1S06A. The exposed pad is slightly different. You should be able to use a common pad dimension for both. Let me know if you have further questions.