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TLV1117LV series Reverse Current Protection

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: TLV1117LV
Hello,
 
I think that TLV1117LV series doesn't have the Reverse Current Protection function.
If there is possibility Vout>Vin,  should we add the reverse current protection diode between Vin and Vout?
 
Best Regards,
Ryuji Asaka
  • 0
    TI__Guru 55940 points

    Hi Ryuji,

    You are correct that we do not have the reverse current protection functionality on this family of parts; however, due to the PMOS pass element we are afforded some protection due to the body diode.  We describe it on pg 10 of the datasheet:

    The PMOS pass element in the TLV1117LV device has a built-in body diode that conducts current when the
    voltage at OUT exceeds the voltage at IN. This current is not limited; if extended reverse voltage operation is
    anticipated, external limiting to 5% of the rated output current is recommended.

    Very Respectfully,

    Ryan

  • 0 in reply to Ryan Eslinger
    Guru 20090 points
    Hello Ryan san,
     
    Thank you for the reply.
     
    Could you please kindly let me know the example of external limiting circuit ?
    For example,   Diode between Vout(Anode)  and Vin(Cathode) ?
             Or , Diode between Vout(Anode)  and the Load(Cathode) ?
     
    Best Regards,
    Ryuji Asaka
  • 0 in reply to Ryuji
    TI__Guru 55940 points

    Hi Ryuji-san,

    A diode between Vout and Vin is what is recommended.

    Very Respectfully,

    Ryan