• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 407 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.

TPS22916: specifications.

Naser S.
Genius 11605 points
Part Number: TPS22916

My customer has doubts of using the TPS22916B or TPS22916C.
1. Is the only difference the rise time?  Considering that we are not concerned about the rise but just the discharge time of the load, are both references the same?
2. The TPS22916 would be controling the power to an IC which absolute maximum current wont be more than 250mA and normal use would be around 2mA
3. We need to guarantee that the device is off after 50ms or less
4. The IC has input capacitors of 100pF and 100nF. Do extra capacitors at the output of the load switch?
5. With the mentioned values which input capacitor of the load switch do we need? Thanks..

  • 0
    TI__Genius 10855 points

    Hi Naser,

    Thanks for reaching out on E2E. The main difference between the TPS22916B and TPS22916C is the turn on time, there are options that have active low enable and no QOD as well.

    Depending on the load, your requirements for input/output capacitance could change. If the output of the load switch has 100nF, we generally recommend adding 10X that amount to the input of the load switch. This helps if the input supply were to sag. In either case, I don't see 100pF / 100nF being an issue.

    The easiest way to determine if the switch turns off on 50ms is to order an EVM and test the system conditions on the board. This will ultimately depend on your load capacitance / resistance, and the input voltage. In general, I don't see an issue with the device turning off in 50ms.

    Thanks,

    Arthur Huang

  • 0 in reply to Alpha H
    TI__Genius 11605 points
    Hi Arthur: Thanks.
    Please provide feedback on the following. I didn’t mention that the load switch and the device which power is controlling is in battery powered device. The device is powered with 2AA batteries to supply 3V to the PCB. This said would still recommend the 1uF input capacitor for the load switch? We are really concerned about the power leakage and power use of the ICs that is why we are using the load switch with a 10nA leakage
  • 0 in reply to Naser S.
    TI__Genius 10855 points
    Hi Naser,

    Thanks for reaching out. I don’t see any issue using 1uF on the input of the load switch.

    If you had an extremely large input capacitance (10-47uF), you could hurt the battery life during hotplug events since the capacitors would draw a huge amount of inrush current, but I don’t see an issue with 1uF.


    Thanks,
    Arthur