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TLIN1028-Q1: Capacitor Selection on Vcc

Part Number: TLIN1028-Q1

Hello,

I hope all is well.

Our design is using a 2u2 10% X7R 16V 0805 capacitor for Vcc signal at pin 8. Two devices are drawing current at around ~23 mA on the Vcc line not including the SBC internal logic current. Is this capacitor sufficient? Or is it recommend to use a 10 uF for this type of current draw. 

Also, could you explain a little bit more in detail the difference between "Support no load to full load" and "20 uA to full load" from the TLIN1028-Q1 Automotive LIN 125-mA (SBC) datasheet.

Thanks and take care, 

  • Hi Gary,

    The characteristics of the LDO output are different for very low current situations that for small currents. When the LDO needs to transition from the very low current (no load) state into one that can supply significant current (full load), a larger capacitance value is required to stabilize the supply during the transition. If there is a significant amount of current draw in the starting state (20uA) then the LDO is capable of reacting faster to a sudden shift in current needs and there is not a need for as large of an external capacitance. 

    Do you know what the minimum current draw from the LDO will be in your application? If it is smaller than the 20uA value, I would recommend increasing the capacitor value to better support the LDO when it passes through the no-load condition to supply the 23mA draw. 

    Regards, 
    Eric Schott 

  • Hi Eric,

    The information you provided was very helpful.

    Thank you for your support!

    Thanks again and take care,

    Gary Washington