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LP3982

or sam
Expert 2020 points
Other Parts Discussed in Thread: LP3982, LP3892

Hi

does LP3982 have reverse battery protection?

if now how can I achieve it? do you have another component close to it that have it?

Regards,

  • 0
    TI__Mastermind 22610 points

    " ... does LP3982 have reverse battery protection?"

    By " ... reverse battery ... " I presume that this is reverse (i.e. negative) input voltage.

    No. The LP3982 is CMOS device with PMOS pass element. Applying a negative voltage to the LP3982 IN pin with respect to the it's GND pin is likely to damage the device, and possibly any sensitive devices connected to the OUT pin.

    The simplest implementation would be to add a series diode (schottky) between the battery and the LP3982 IN pin, keeping the input capacitance on the LP3892 side of the diode.

    There are some bipolar type regulators that are designed for automotive reverse battery, but I don't have enough information on your application to say if they are suitable for yor application or not. The automotive bipolar regs will draw more current, thus shorter battery life, when compared to CMOS regs.

     

  • 0 in reply to Donald Jones
    Expert 2020 points

    Hi

    By saying " reverse battery protection" I meant if I will connect the battery upside down (battery + to the LP gnd and battery - to LP Vin).

    I think this is what thought I meant.

    in the datasheet it is written that this component is close to MAX8860 but from what I understand max8860 has reverse battery protection so why is there a difference between those 2 components. does this is the only difference?

    when you wrote series diode what do you mean? doesnt 1 diode should solve this issue?

    thanks in advanced,

       

  • 0
    TI__Mastermind 22610 points

    See also : Application Report SLVA139 "Reverse Current/Battery Protection Circuits"

    http://www.ti.com/lit/an/slva139/slva139.pdf

  • 0 in reply to Donald Jones
    Expert 2020 points

    thank you very much for your helpful data