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LM70860-Q1: LM70860-Q1 Reverse polarity protection

Ömer Kalayci
Prodigy 225 points
Part Number: LM70860-Q1

Tool/software:

Hello,

I will use the LM70860-Q1" integrated circuit in an automotive ECU, I could not find any information about reverse polarity protection in the datasheet, I would be glad if you could answer the following questions

Q1-) I am planning to use a Schematic like the one above, and when the supply pins are connected in reverse (-40V), will the LM70860-Q1 component fail? Do I need to do reverse polarity protection with an external P-Channel mosfet?

Q2-)I am planning to use a Schematic like the one above, will the LM70860-Q1 fail during the following tests? Do I need to do reverse polarity protection with an external P-Channel mosfet?

ISO 7637-2 Pulse 1 and Pulse 3a

best regards

  • +1
    TI__Guru 56345 points

    Hi Omer,

    Ömer Kalayci said:
    Q1-) I am planning to use a Schematic like the one above, and when the supply pins are connected in reverse (-40V), will the LM70860-Q1 component fail? Do I need to do reverse polarity protection with an external P-Channel mosfet?

    Yes, you will need to have an external P-channel FET to protect the LM70860-Q1 supply rail from going negative because it does not have reverse voltage protection and will be damaged if -40V is applied to VIN. 

    Ömer Kalayci said:
    Q2-)I am planning to use a Schematic like the one above, will the LM70860-Q1 fail during the following tests? Do I need to do reverse polarity protection with an external P-Channel mosfet?

    Yes, I believe so.

    Ben

  • +1 in reply to Ben C
    TI__Genius 11325 points

    Hi Omer, 

    In addition to Ben's reply - you can consider TI's reverse polarity protection devices - the LM7450x-Q1 family should be a good starting point for you - (https://www.ti.com/product/LM74500-Q1). You can also look at the https://www.ti.com/product/LM74700-Q1 - this family adds reverse current blocking in addition to reverse polarity protection. 

    Thanks,

    Best Regards,

    Taru