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TPS25921A: Use TPS25921A in Parallel

Part Number: TPS25921A
Other Parts Discussed in Thread: TPS25921L, TPS25982

Dear Specialists,

My customer is considering TPS25921A and to use in parallel.

According to the application note(SLVA836), TPS259241 is possible.

http://www.ti.com/lit/an/slva836/slva836.pdf

Is TPS25921A possible to use in parallel. 

I appreciate your great help in advance.

Best regards,

Shinichi

  • Hi Shinichi,

    Yes TPS25921 can be paralleled similar to TPS259241 in the app note. It is better to use the Latch off variant, TPS25921L instead of TPS25921A while using in paralleling operation. 

    May I know what is the maximum load current in your application ? Are you aware of our high current eFuse TPS25982 ? This device can handle max load currents upto 14A. 

  • Hi Praveen,

    Thank you for your reply.

    I understand TPS25921 can use in parallel the same as TPS259241.

    Also TPS25921L is recommended in this application.

    If load current is less than 14A, it is another choice.

    I'll share these information with the customer.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi

  • HI Praveen,

    The customer has an additional question regarding your comment.

    I would be grateful if you could advise.

    ---

    You mentioned latch-type is more recommended than Auto-Retry. 

    On the other hand TPS259241 is Auto-Retry type.

    Could you please let us know the reason.

    ---

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi

  • Hi Shinichi,

    During over current event, one of the eFuse will turn OFF first followed by other eFuses in parallel. If the eFuse is an auto-retry variant, the eFuse will turn ON after sometime. During Retry the eFuse which turned OFF first will startup first and take most of the stress.

    Also, The restart delay of eFuse may vary slightly depending on the RQJA (layout) of each eFuse as the eFuse will restart after cooling 10C. 

    This may not be a big issue as the startup delay between different eFuses may not be significantly high. Customer can test this condition on their system as well.

  • Hi Praveen,

    Thank you for your reply.

    I understand the attention point when using Auto-Retry.

    I'll share this information with the customer.

    I appreciate your great help.

    Best regards,

    Shinichi