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TPS737: Reverse polarity protection on the input

Jason Raubenheimer
Prodigy 20 points
Part Number: TPS737

I'm designing a circuit that will be powered by a battery. Do I need to incorporate some sort of reverse polarity protection before this LDO regulator (for example a diode) or will the regulator take care of a reverse polarity scenario on the input. (For example if the battery is inserted the wrong way around by the user)

Thanks in advance

  • 0
    TI__Mastermind 23361 points

    Hi Jason,

    According to the datasheet, TPS737 is a NMOS device and the built-in reverse current protection may need to have EN low to be active.

    Here is how the datasheet describes regarding to the reverse current protection. If you have IN and EN shorting together for the application, when the reverse polarity happens, EN will be low as well, then the protection is active. If you have a speratate signal driving EN pin, and EN could stay high when reverse polarity happens, you will need to consider adding the diode for reverse protection.

    Does it make sense?

    Regards,
    Jason

  • 0 in reply to Jason Song
    Prodigy 20 points

    Hi Jason

    Thanks for the response.

    In my application I do have the IN and EN pins connected together, so if I understand you correctly, this means that I will have protection against reverse polarity, correct?

  • 0 in reply to Jason Raubenheimer
    TI__Mastermind 23361 points

    Hi Jason,

    If you have IN and EN connected togther, when a reverse polarity happens, the ground will be applied on EN and VIN while a positive voltage will be on the output. For this case, you will be protected for reverse current. 

    Regards,
    Jason