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TPS62743: Shipment mode design with enable pin

user4331958
Prodigy 35 points
Part Number: TPS62743
Other Parts Discussed in Thread: TPS22916, TPS22915, BQ25120, BQ24045, BQ24040

Hello,

I am working on a wearable and looking for a shipment mode design. I saw the article used in battery management part of my device. I do not use button, I want to wake up with external 5V from my charging device. Schematic is look a bit messy but actually same design in article. Also TPS62743 consumes 7nA in shutdown mode which is less than TPS22915B, am I wrong ?

Thanks for your replies.

  • 0
    TI__Genius 10855 points

    Hi User,

    Thanks for reaching out on E2E. For this small battery application, I recommend taking a look at the TPS22916 instead of the TPS22915.

    The TPS22916 has ultra-low quiescent current and shutdown current for extending your battery life. Taking a look at the TPS62743, the device consumes anywhere from 360nA to 1800nA depending on the output load, whereas the TPS22916 consumes roughly 500nA - 1000nA. For shutdown current, the TPS62743 consumes anywhere from 70nA - 1000nA depending on the load. The TPS22916 consumes 10nA - 100nA.

    The TPS22916 is also offered in a small WCSP package (0.78mm * 0.78mm). 

    Let me know if you have any additional questions!

    Thanks,

    Arthur Huang

  • 0 in reply to Alpha H
    TI__Guru*** 142750 points
    Hi User,

    Typically, ship mode would be taken care of by the battery charger such as bq25120. Then, the DC/DC would connect to PMID and not to the battery directly. With this architecture, there is just one leakage path from the battery (in the battery charger) during ship mode instead of into every device on the PCB.
  • 0 in reply to Chris Glaser
    Prodigy 35 points

    Thanks for the advice. bq25120 has 1.8V default voltage but unfortunatelly my uC run with 1.85V(min) so I thought that I can not increase output voltage by sending I2C command.

  • 0 in reply to Alpha H
    Prodigy 35 points

    Thanks for your reply. Ok I will use TPS22916 then I have another problem. I need to control current flow through charge socket to BQ24045 on the board. So same pin in charge socket will reset shipment mode and open BQ24045 input path. I attached my design. Is it wrong ?

  • 0 in reply to user4331958
    TI__Guru 65746 points
    The BQ24045 will work well in a ship mode configuration, with Vin =0V the quiescent current will only 1uA. Configuration of the BQ24040 looks good.
    Have not reviewed the ship mode switch circuits.