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TPS65988: Questions for power path configuration and reverse current protection

Tiger Yeh
Expert 5445 points
Part Number: TPS65988

Hi~

I have some questions below, please kindly help to check and reply, thanks a lot!

1. We saw the reverse current comparator for external power path, PP3 & PP4, in EVM schematic, do they must to have?
Because current customer's PCB space is limited, they want to find any chance to reduce some components.

2. May we use PP1 and PP2 as sink power path. And PP3 and PP4 are source power path.
Suppose this is no problem.

3. Any concern to set power path to be both input and output for saving external power path cost

  • 0
    TI__Mastermind 36756 points

    Hi Tiger,

    1. The external RCP is not mandatory but is recommended. If they don't implement RCP, they can use the SRDY commands to control which power path closes to ensure that both will not be on at the same time. Or they could use the MultiPort Sink Policy field to only allow for one sink path to close at a time.

    2. This is possible. In this case, you can use two 5V load switches externally to source 5V. Additionally, you won't need to implement the multiport sink policy from question 1 since the 988 will handle RCP on the internal paths.

    3. This would complicate their external power supply design. They would need to have a bidirectional buck-boost charger on the other end of the power path to either supply 5V, or take the sink voltage and charge the battery.

    If this answers your question, PLEASE select This resolved my issue

    Thanks,
    Eric

  • 0 in reply to Eric Beljaars
    TI__Expert 5445 points
    Thank you so much for quick reply, Eric.
    Have a nice day.