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TPS2105: Consultation on Problems in Material Use

Piero Yu
Intellectual 950 points
Part Number: TPS2105
Other Parts Discussed in Thread: LM66100, TPS2115A

Now we use TPS2105, two-way power switch, one is battery power supply, the other is 3.3V power supply. When the battery power supply is small, the current of 3.3V power supply is 50mA. When 3.3V is electrified, it is always enabled. When 3.3V is electrified, MCU3.3V is supplied by 3.3V. When 3.3V is not available, it is supplied by battery power. Now it is found that in the process of switching, MCU3.3V is pulled down and the single chip reset. The timing of power on this chip can't be controlled. Help me to see if I can solve the reset problem. If it can't be solved, please help recommend the appropriate chip.

  • 0
    TI__Genius 10855 points
    Hi Piero,

    Thanks for reaching out on E2E!

    I am unable to see the image you provided, can you reattach? It would help if you could attach a schematic of the application.

    Can you elaborate on what "electrified" means? To my understanding, it sounds like you're having an issue with the timing of the chip, is that correct?

    Thanks,
    Arthur Huang
  • 0 in reply to Alpha H
    Intellectual 950 points

    "electrified" is just mean 3.3V  is in power supply at this time, Because   3.3V is not available sometimes .  and Can you see the picture now?

  • 0 in reply to Piero Yu
    TI__Genius 10855 points

    Hi Piero, 

    What is your load current? To my understanding, you're saying that the output is pulled to 0V when switching between IN1 and IN2, is that correct? How do you know that the device is resetting? 

    If you're looking for another device for simple battery ORing, I recommend looking at the LM66100 or the TPS2115A. 

    Thanks,

    Arthur Huang

  • 0 in reply to Alpha H
    TI__Genius 10855 points
    Hi Piero,

    I haven't heard back from you in a bit, have you been able to resolve the issue?

    Thanks,
    Arthur