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TPS2HC08-Q1: Reverse Battery protection

Oscar Liborio
Intellectual 930 points
Part Number: TPS2HC08-Q1

Tool/software:

Hello,

My costumer has a question on the Reverse polarity protection (RPP) functionality of the HSS:

Does this substitute the need of a Reverse polarity protection IC (LM74xx-Q1 + Fet or diode) ?

Is the load that follwos the HSS protected from a Reverse Polarity event ?

Based on my understanding this feature protects only the device itself but not the load or whatever come after the HSS.

In case the device can substitute a classical RPP does it meets all automotive ISO7637 transient requirements?

It seems that based on the DS this supports only a part of the requirement of the ISO7637 (test 2?)

Thanks,

Oscar

  • +1
    TI__Genius 10285 points

    Hey Oscar, 

    The GND network recommended for the reverse battery circuit does not substitute the need of a RPP IC (LM74xx-Q1 + Fet or diode). Your understanding is correct, only the high-side device is protected under this connection. The load reverse current is limited by the impedance of the load itself.

    With the RPP IC, both the device and load are protected when in reverse polarity. The blocking diode does not allow any of the current to flow during reverse battery condition.

    BR, 

    Alan