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TL431LI: CL for stable operation

Part Number: TL431LI

Hi Team,

My customer is considering to use TL431LI to generate 3.3V power supply for RTC which requires less than 10uA.

I was asked to review their following schematic though, could you help that?

They mind CL is enough to get stable operation with the circuit below especially.

According to the datasheet, more than 2uF is needed for very low IKA condition, I think they should put much amount CL to prevent oscillation.

So could you tell me how much CL is recommended for safe operation under VKA=3.3V condition when DC bias is also taken into account?


Takashi Onawa