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MK22DX256VMC5 VOUT33 output not good when VREGIN changes

Question asked by Huijie Jiang on Nov 27, 2017
Latest reply on Dec 5, 2017 by xiangjun.rong

We are using the internal regulator, and VOUT33 output voltage(+3.3V on the schematic) rise to 3.8V when there is an fast voltage dip on VREGIN("+5V" on the sch, "+5Vout" in the graph), see below for the sch and graph.

 

We guess that is because of the PSRR, but we cannot find the PSRR parameter in the datasheet...

 

What is the root cause and how can we improve the performance?

PS

 

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