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How to choose a Super capacitor

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chicken_feet

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Hi all,

I am designing an interface board to a GSM module and notice that many reference design make use of the Super Cap.

My question is, how do one choose the correct value of the Super Cap? As I have checked on most data sheet of Super Cap, only these parameters are specified, namely - Rated Voltage, Capacitance and ESR.

How do I know the rated current of the Super cap?
How do I know if the Super Cap withstand a momentary 2A of transmission burst?
What value of capacitance should I choose?

At this moment of time, i am connecting the Super cap directly to the output of my switching regulator. I am assuming when the transmission surge comes, it's the Super Cap that will provide, not the Switching regulator. I am wondering if this design is workable...

Thanks for any infor.

Best rgds,
Pang
 

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