• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 736 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS62260: Is it possible to supply +3.3V external power on TPS62260's output?

user4292685
Intellectual 945 points
Part Number: TPS62260

Dear Sir,

I need to suppy +3.3V external power on TPS62260's output because of MCU firmware update as below.

Is it possible? Does this external power supply damage TPS62260's internal circuit?

In terms of FB pin it would be OK because a small leak current like 4uA. I think it can not damage an internal circuit from the leak current point of view.

How about internal High side FET from the inrush current of view?

  • 0
    TI__Expert 5425 points
    If the device is supplied with a voltage higher than 3.3V, configured in power save mode enabled (MODE to GND) and enabled before you connect the 3.3V at the output I think it should be ok. The mode of operation would not be different to power save mode.
  • 0 in reply to Juergen
    Intellectual 945 points
    Sorry for late reply.
    I tried this external power supply connection on TPS62260's output and the device was broken (No output proper voltage as 3.3V).
    In this case the impedance between 1pin(SW) and gnd was around 5ohm and it looks like an internal FET (Low side?) is broken.

    So as a result, the answer above is something wrong.