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LM2731: Output voltage ripple at small load currents

Part Number: LM2731

Tool/software:

Hello, 

regarding the below schematic there is the following issue: 

At small output currents of ~1mA there is a ripple at the output voltage with f=~25kHz and 5mV magnitude.

I also attached a picture of the signal measured by a scope with the settings of 20µs/div, and 5mV/div


What could be the reason of this behaviour?

Best regards