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LP5951: MAX current for ISC(Output current(short circuit))

Keigo Shimada
Expert 5475 points
Part Number: LP5951
Other Parts Discussed in Thread: TLV700

Hi team, 

Our customer consider to use LP5951MGX-2.5/NOPB as alternative for TLV70025DCKR to avoid delivery trouble.

Could you kindly give us comment on the following questions?

  1. What is the difference between ICL(Output current limit) and ISC(Output current(short circuit))? We can see ICL in TLV700 datasheet, ISC in LP5951 datasheet.
  2. What is the MAX current for ISC? MIN is 150mA, TYP is 400mA but MAX is blank. 

Best regards, 

  • 0
    TI__Genius 12511 points

    Hi Kazuho,

    1) Output current limit is when current is drawn until the current limit is triggered. Short circuit current limit is when the output is shorted to ground. In the case of these devices, both have brickwall current limit, so the spec can be thought of as identical.

    2) We do not spec a max for current limit, only a min to assure that the part can output the 150mA that is is advertised for. At higher currents Thermal shutdown begins to become dominant and it will trip causing the part to switch on and off as it enters and exits thermal shutdown.

    Regards,

    John

  • 0 in reply to John Schneider
    TI__Expert 3086 points

    Hi John, 

    Let me confirm one thing on behalf of Kazuho. 

    Inrush current of customer's circuit can be as high as 600mA, based on your answer I think it won't cause problem, am I correct?

    Thanks.

    Regards,

    Jo

  • 0 in reply to Hung Ching Hsu
    TI__Genius 12511 points

    Hi Jo,

    What will occur is the inrush current will spike up, then current limit will come in and it will settle at the current limit of 400mA, before beginning standard regulation. The profile of this current shape will look similar to the following showing off the three phases of the inrush current. The current limit will protect the device so that it is not destroyed in normal operation. The LDO will not have any problems from this operation, no.

    Regards,

    John