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TPS22903 as external MPPT Switch for BQ25504

Mathias Mair
Prodigy 90 points
Other Parts Discussed in Thread: BQ25504

Hi,

i would like to use the TPS22903 as a switch to charge a 33pF reference capacitor every 50ms to realize an external MPPT Circuit for the BQ25504.

Since there mustn't be any leakage from cref (insulation resistance = 1000GOhm (~0,003nA @ 3V))  my question is if there is any leakage current (>0,01nA) of the tps22903 floating from VIN to VOUT or vice versa when ON = GND?

Best regards,

Mathias 

  • 0
    Prodigy 90 points

    As i found out, there will always be a reverse current from output to input through the body diode of the mosfet unless i use a load switch with integrated reverse current protection.

    I have only found the TPS22930 with reverse current protection in your lineup, but the minimum input voltage is 1.4V and the reverse leakage current is still 2uA.

    Aren't there better solutions for my problem, how does this work inside the BQ25504?

    What do you think of  2 p-channel mosfets in a back to back configuration and is it possible to to the same with to load switches (e.g. TPS22903)?

     

  • 0 in reply to Mathias Mair
    TI__Genius 10370 points
    Hi,

    I apologize that no one has followed up with your question. I'm going to close this thread, but if you still have a question please feel free to post a brand new thread instead of replying to this one. We will do our very best to respond within 24 hours to any new post you might have :-)

    Best Regards,
    Aramis P. Alvarez