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TPS25946: Two switches in parallel for redundancy

Robin Prillwitz
Prodigy 20 points
Part Number: TPS25946
Other Parts Discussed in Thread: TPS25981

Tool/software:

Can two TPS25946 switches be used in parallel, with identical settings for EN/UVLO, OVLO, ITIMER, dVdt, ILM and PGTH?

We intend to connect our system's primary battery connection through this switch. Our charging and discharging currents will always be less than 5.5A, so a single device would suffice; we do not intend to increase the maximum current capacity. However, this configuration poses a critical single-point of failure if the switch were to fail open. To address this, we considered using two devices in parallel. Unfortunately, I have been unable to find any information in the datasheet or these forums regarding this configuration.

This is our current configuration of the two parallel switch setup:

(The values for the ITIMER, dVdt and ILM pins are still TBD)

Best regards,

Robin

  • +1
    TI__Mastermind 38835 points

    Hi Robin,

    Yes, two devices in parallel can be used to get lower Ron and also provide additional path in case of any failure. TPS25981 is from same family of device. We have provided parallel config in its datasheet. It will be helpful if you can check that also.

    Here, instead of starting both at same time, first eFuse starts and then second eFuse turns on and then using PG of second eFuse, load is turned on. This is important when the load is greater than single eFuse capability. In your case, your schematic also works. You will have to choose ILIM carefully if your load cannot handle very high currents. 

    Best Regards,
    Arush