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TPS22966 Input/Output CAP requirment

James Li1
Prodigy 10 points
Other Parts Discussed in Thread: TPS22966

Hello,

        TPS22966 datasheet recommend to have an input capacitor about 10 times higher than the output to avoid the voltage drop. I am not clear about this requirment. Could somebody help to explain more detail about it? Thanks a lot in advance!!!

  • 0
    TI__Expert 5275 points

    Hi James,

     

    When the switch is initially turned on, the output capacitance is uncharged. This will lead to a spike of inrush current when the output capacitance is being charged up.  If the input capacitance is too small, this spike could cause the supply voltage to droop below its set point. Therefor it is generally recommended to have this 10:1 ratio.

    The voltage droop issue could also be addressed by increasing  the slew rate of the device via additional capacitance on the CT pin.

     

    Regards,

    Adam Hoover

    Load Switch Applications

  • 0 in reply to Adam Hoover
    TI__Expert 5275 points

    Hi James,

     

    Do you have any other questions about this?  Can we consider this matter resolved?

     

    Thanks,

    Adam