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TPS63030: Flickering power supply with large capacitor

Part Number: TPS63030

Hi, 

We power an ESP32 with a TPS63030 using 2x C type alkaline batteries in series. 

To allow the batteries to fully drain and to avoid brownout we use a 2000uF capacitor on the output of the buck-boost (3.3v).

When powering the circuit with a bench power supply we see that the CC limit of 2.5A is reached and that the PS is flickering a bit. 
Removing the 2000uF cap removes the flickering. 

The circuit operates just fine, but we just want to know if this problematic. 

Thanks! 
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