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Original question:

LM2931 M-5.0 - Excessive Output Voltage

LM2931-N: LM2931

Mayank Singh
Prodigy 40 points
Part Number: LM2931-N

Can I use a ceramic capacitor as input, output decoupling capacitor with LM2931 series? or is electrolytic/tantalum capacitors mandatory?

  • 0
    TI__Mastermind 49465 points

    Hi Mayank,

    Electrolytic/tantalum is not mandatory for this device. The requirement for the input and output capacitors are only in the value of the capacitor (at least 100uF for COUT) and ESR of the output cap for stability, see the plot below from the datasheet. The plot is somewhat difficult to read since the y-axis is a log scale but does not have minor tick marks, but it looks to be a minimum ~30mΩ. This ESR may be difficult to get with a ceramic cap, so if you want to use this device you may need to put a resistor in series with the output cap to artificially add the required ESR.

    Regards,

    Nick