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TPS62130A: Reverse current protection

Oba
Genius 17875 points

Part Number: TPS62130A
Other Parts Discussed in Thread: TLV62130A

Hello,

 

I have some questions for TLV62130A about reverse current protection.

 

My customer is designing a system with TLV62130A and this TLV62130A provides 3.3V to the external board through the connector.
Although it is not likely, there is still a possibility that their end user connects the external board in wrong way.
In that case, 3.3V could be input from the external board to TLV62130A Vout although TLV62130A VIN is 0V.

Then they have some questions.


1. Does TLV62130A have any reverse current protect function?
2. If it doesn’t have (I think), what kind of failure mode could happen in TLV62130A?
3. They are considering to add a diode and think there are 3 possible cases like the below figure.
    Which is the best location to put the diode, (1), (2) or (3)?

 

4. Actually they don’t want to put the diode on (1) because it causes diode drop. Is it possible to put it on (2) or (3)?

 

Regards,
Oba.

 

  • 0
    TI__Mastermind 28010 points

    Oba,

    Please refer to this app note for details on specific considerations in your situation: http://www.ti.com/lit/an/slyt689/slyt689.pdf

    Answers to your questions:

    1. The reverse current will flow from output to the input through the high-side FET body diode. There is no reverse current protection scheme I see mentioned in the datasheet. 

    2.  Failure considerations: The IC will not fail as long as

          a. the reverse current stays below the forward rating of the IC

          b. the input voltage does not increase past the absolute max rating, and

          c. the device does not exceed max junction temperature rating. The losses of the body diode could be high due to the significant voltage drop.

    3. A diode is actually recommended at the input rather than the output - please refer to figure 3 in the app note I mentioned above. It is possible to have the diode at the output with some special considerations to ensure proper regulation of the output voltage - check figure 4 and relevant details.

    Regards,

    Amod