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TPS254900-Q1: Internal power switch in client mode

Arie Li
Expert 3390 points
Part Number: TPS254900-Q1

Hi team,

I learned from datasheet "The internal power switch is OFF to block current flow from OUT to IN" in client mode. But since there exist a body diode of MOSFET, why doesn't  the current flow from OUT to IN through the body diode? What will happen in CDP mode if I connect the output(OUT,D-,D+,GND) to a computer USB port? What kind of impact will the 5V voltage from computer USB port have on the input of TPS254900?

BR

Arie

  • 0
    TI__Expert 8420 points

    Hi ,

    We have notice your question, will reply you soon!

    Michael 

  • 0 in reply to Michael Tan
    TI__Expert 8420 points

    Hi Arie,

    To be notice that , the IN and OUT pin mosfet internal body diode haven't been connect to the ground.  We have put a special method to deal with the body diode for the internal FET. There not any current can flow back from OUT to IN during the internal FET is  power off . 

    If in the CDP the output pin connect to the VBUS (5V) , two different DCDC converter output one from computer the another from tps254900 will connect together . It may cause one of them work not stable but I don't think will case same damage . Any way  this is special case will not happen in the tps254900 in client mode.