• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 260 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TPS22810: Connecting multiple load switches in parallel (TPS22810)

TPS22810: TPS22810 in parallel

zhirong yang
Prodigy 60 points
Part Number: TPS22810
Other Parts Discussed in Thread: TPS27SA08

I want to use the 3 x TPS22810 load switch in parallel for a 12V / 7A power rail,and I have below questions:

1. As the Rds(on) for each load switch might differs, how can we ensure the equal balance of load current sharing. One of the load switches will tends to have more current flowing than the others. This will result having that particular load switch to be burnt out easily as compare to the others.

2. The turning-off the load switches, the turn off delay for each of the load switch will be of different timing. so one might be turning off faster than the others. And this result the slower turning off load switch needs to take the share of the load current. This adversely will cause the slower one to be overloaded and burnt out.

  • 0
    TI__Mastermind 32650 points

    Hi Zhirong,

    The answer to both our questions is that it is not possible to load balance with load switches. There will always be device to device variation that can cause the concerns you talked about. We only recommend paralleling load switches in the situation where total R_on is to be dropped but where concerns like unbalanced current sharing is an acceptable risk.

    I would suggest looking into higher rated devices in our High Side Switch portfolio like TPS27SA08 which is rated for a continuous current of 10A at an ambient temperature of 70C.