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TPS562208: Why is R3 resistor inserted on EN signal line as Figure 19?

Part Number: TPS562208

 Hello guys,

 One of my customers is going to evaluate TPS562208 for next their products.

 They have a question as the follow. Could you please give me your comment?

 Q. Why is R3 resistor(10.0kohm) inserted on EN signal line as Figure 19 on page 12 of the device datasheet?

     Is the resistor mandatory?

  Your reply would be appreciated.

 Best regards,

 Kazuya.