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TPS65381-Q1: The input current value of VBATP pin when IGN pin is 0V

masahiko shimizu
Guru 11235 points
Part Number: TPS65381-Q1

Hi,

My customer is confirming the input current value of VBATP pin when IGN pin is 0V.

Please see below picture.
After IGN-OFF, the input current of VBATP pin has the change as below picture.
Could you let me know the reason of the change of current?
What does TPS65381-Q1 do in internal IC after IGN-OFF?

The power supply is only supplied TPS65381-Q1.
ECU, customer board is in system reset.  

Best regards,
Shimizu

  • 0
    TI__Intellectual 1990 points
    Shimizu-san,

    Thanks for the post! I have assigned this thread to the expert on this device. In the meantime, do you know what the voltage is at VBAT during this time? Would you happen to have a profile of the VBAT voltage similar to the current profile you provided? We will send a response out soon. Thanks again for the post!

    Regards,

    Paul Kundmueller
  • 0
    TI__Mastermind 20590 points

    Hi Shimizu-san,

    We specify the Standby current only in static terms and I don't know of any internal reason you see a change in the units of seconds with the device. I could imagine there may be some changes in their system they aren't accounting for such as capacitors discharging, etc that could be placing unexpected transient conditions on some of the device pins that could influence the standby current indirectly. Is the time unit really seconds?

    Is the customer sure they are not doing anything in the system at these time frames, there is nothing inside the TPS65381x-Q1 that will change 67 seconds after entering STANDBY mode.  

    We specify the STANDBY current in the datasheet as:

    So it looks reasonable on average what they are seeing, but as mentioned there isn't any state change inside the TPS65381x-Q1 seconds after going to STANDBY.  All state machine actions are completed within a few device clock cycles and the rails and charge pump will be shut off and discharging with a few uS, not seconds.  That is why I think it may be a slow discharge or reaction somewhere else in their system that is influencing the TPS device.

    Scott