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LM5060-Q1: Reverse Output Protection

Robert Ruchar
Prodigy 70 points
Part Number: LM5060-Q1
Other Parts Discussed in Thread: LM5060, , LM5069

Hello,

I need a reverse battery protection for a CC/CV (buck) charger (14.5V / 1Amp). I'm thinking of LM5060 (generic application diagram; Vin - charger output, Vout - battery port). I do not need a back-to-back switch as the input polarity is guaranteed (charger output). In fact, a back-to-back switch would be useful for reverse current flow (from battery to the charger) protection that I need, but LM5060 does not support that functionality, does it ?

In the datasheet, page 4, note (5) refers to -25V maximum. Is adding Ro resistor in series with OUT pin sufficient to protect the device ?

I assume that connecting reverse battery to an unpowered unit should be safe. How about connecting reverse battery to a unit which is up and running (with no or light load), providing 14.5V at the battery port ?

Thank you for your attention.

Regards,

Robert

  • 0
    TI__Guru** 105361 points
    Hi Robert,

    Welcome to E2E!
    It is an interesting use case. LM5060-Q1 is widely used for input protection which also includes reverse battery protection at input. Let me spend some time to check the suitability and verify on EVM to confirm.
    I would be able to get back by mid of next week due to some other critical activities. I hope it is ok for you!

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    TI__Guru** 105361 points

    Hi Robert,

    For your use case - when a reverse battery is connected, large currents flow and a fast short circuit protection on the charger side would help to cut-off the path. LM5060-Q1 short circuit response would not be enough. I suggest to use LM5069.

    Please get an EVM of LM5069 and verify on your system.

    Best Regards,

    Rakesh