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TPS53219: TPS53219 EN pin abnormal voltage when pull-up resistor is 300kohm

Part Number: TPS53219

Hi Sir,

My customer has a question that when he adds pull-up resistor EN for 300 kohm (pull up to 3.3V), EN pin voltage will become 3.9V. when pull-up resistor changes to 10 kohm, EN pin voltage will become 3.3V. I duplicated this situation and found that it really has a higher voltage than pull-up voltage when the pull-up resistor is higher than 10 kohm. The schematic and test result are shown below. could you please kindly tell us the reason of it? thank you so much.

I changed R4 value for 300k, 200k, 100k, 10k and 1kohm and NI R2, R3 and C20.

R4 value

EN voltage

Pull up voltage

300kohm

3.778V

3.2351V

200kohm

3.596V

3.2351V

100kohm

3.415V

3.2351V

10kohm

3.249V

3.2351V

1kohm

3,2388V

3.2351V

Best regards,

Ann Lien