• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 358 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.

TPS727: Drop out current consumption

ChangedDaily
Prodigy 70 points
Part Number: TPS727
Other Parts Discussed in Thread: TPS7A20

Hi,

I am using the TPS72733 to regulate an input voltage of nominal 3.7V. All works fine but when the input voltage falls to around 3.3V (the regulation voltage) the current consumption of the regulator increases to around 500uA. Is this expected behaviour?

Thanks

  • 0
    TI__Guru 50190 points

    Hi,

    Yes, this is common with most LDO's as they get into drop-out, their IQ increases.

    We do have a newer low IQ RF LDOwhich is much better all around. The TPS7A20 is now sampling. 

    Let me know what you think.

    Regards,

  • 0 in reply to JCHK
    Prodigy 70 points

    Hi,

    Thanks for the confirmation regarding the increased Iq.

    Regarding the TPS7A20 I notice the line in the data sheet for Ground Pin Current in dropout states a maximum of 20uA, is this effectively the maximum Iq under these conditions?

    Thanks

    Patrick

  • 0 in reply to ChangedDaily
    TI__Guru 50190 points

    Hi Patrick, 

    This is the worst-case no-load IQ under normal operating conditions. 

    I was able to get this simulation of the TPS7A20 showing the behavior as VIN rises through 3.0V (VOUT set to 3.0V).

    I hope this helps.

    Regards,