• State Resolved
  • Locked Locked
  • Replies 6 replies
  • Subscribers 63 subscribers
  • Views 251 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TPS2116: TPS2116DRLR output capacitance value suggestion

Adi Tech
Prodigy 90 points
Part Number: TPS2116

Tool/software:

Hello, 

We have implemented the "TPS2116DRLR Power Switch 2.5A SOT-583" IC in our product. 

Instead of the recommended output capacitance of "100uF capacitor", we have opted for a "47uF SMD 1206 Ceramic Capacitor", Following the guideline provided in the datasheet (please refer to the below photo).

 

Could you please advise if there are any potential technical issues that may arise from the use of the "47uF capacitor" in the functionality of the "TPS2116DRLR" IC?

Thank You.

  • 0
    TI__Mastermind 28645 points

    Adi,

    In this part of the datasheet, they are just using the 100uF as a hypothetical design requirement. It will be different depending on what your application is. With 50uF you would have less inrush and there would be even less risk.

    Best Regards,
    Tim 

  • 0 in reply to Timothy Logan
    Prodigy 90 points

    Thanks for response, I got the benefits of  low value capacitor here, but, Please, Could you provide disadvantage of low value 47uF Capacitor? So based on this we can make decision.

  • 0 in reply to Adi Tech
    TI__Mastermind 28645 points

    Adi,

    The capacitor on the load is just an example of what the load could be on an application- the real value depends on whatever load you are trying to drive in your application. There is not a recommended value or required value- it really depends on what is on the output of the load switch.

    The reasons you would care about high capacitances on the load is that when t=0 there is essentially a DC short-to-ground through the capacitor. While time happens, the capacitor charges up and the output current levels out to steady state, however you want to make sure that the device limits the inrush current and does not go into any thermal fault.

    Best Regards,
    Tim 

  • 0 in reply to Timothy Logan
    Prodigy 90 points

    Below is our schematic. Output Load is 4.2V at 600-700mA. In Starting Peak current is about 1A for 5-10 seconds. So, Please suggest required output capacitor for our circuit.

  • 0 in reply to Adi Tech
    Prodigy 90 points

    Please provide your valuable feedback for this.

  • +1 in reply to Adi Tech
    TI__Mastermind 28645 points

    Adi,

    We don't have a recommendation for a capacitor here. This is just an example value for whatever would be on the right of your power mux.

    Maybe a more productive question here would be what is on the output of the power mux? If whatever on the right of you power mux has 50uF capacitance, that is your capacitance. The capacitor that we reference in the datasheet represents the load, not a requirement for the power mux to operate correctly.

    Best Regards,
    Tim