We mount the TPS25750 on our controller unit and we can connect the tablet with it.
The controller unit works as source only.
When the controller unit is powered off, the tablet temporarily supplies power from VBUS, and the TPS25750 operates as a dead battery condition.
At this time, no current should flow from the VIN_3V3 pin, but we observed the current from VIN_3V3 for a short time.
This current raises the voltage on VIN_3V3 to approximately 0.15V.
The voltage may rise more, causing the controller unit to repeatedly turn on and off. We are worried about damaging the device in the unit, and have some questions.
- Is there any specification on the current flowing from the VIN_3V3 pin and the time until the current stops?
Unless otherwise specified, it may be necessary to pull down the VIN_3V3 pin voltage to prevent it from rising, or to use a protection device to prevent reverse voltage from being applied to the device. - What configuration suppresses the current flowing from the VIN_3V3 pin? EEPROM and pin strapping.
Regards,