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LP2992: BYPASS pin capacitor type

Ella KIM
Expert 3862 points
Part Number: LP2992

Hi team,

Customer is using LP2992AILDX-5.0/NOPB for powering GPS antenna.

As per the DS, noise bypass capacitor for BYPASS pin is recommended to use either NPO or COG capacitor. Due to BOM problem, they are going to use 10nF X7R type capacitor. Do you expect any problem with X7R? My concern is the load, GPS antenna, is quite sensitive to noise. Thank you for your advice in advance.

  • +1
    TI__Mastermind 23361 points

    Hi Ella, 

    For the BYPASS capacitor, there are two things we need to consider. One is the effective capacitance, and X7R should still be able to provide the needed capacitance for filtering even with slightly larger variations from unit to unit comparing to COG and NPO. The 2nd thing we need to consider is the leakage current as this will affect the voltage on the BYPASS pin, and this voltage will be gained up to set the output voltage. X7R tends to have higher leakage than the NPO and COG, and for most applications, X7R should be fine, but if greater accuracy is needed, we recommend having the lowest leakage capacitor possible. 

    Regards, 
    Jason Song