Thank you for contacting the MPS Forum. This information isn’t stated in the datasheet, I’m not sure this is appropriate functionality for this device but I can look into this for you. Keep in mind that many engineers are out on vacation at this time so answers are delayed. Note the way the device is controlled in the datasheet:
The PWM functionality actually refers to the current limiting functionality, you can read more about this in the datasheet page 10.
If you would like to try PWM signals on the ENBL pin yourself, my suggestion would be to order an evaluation board of this device for your own testing.
Field Applications Engineer
Monolithic Power Systems | MPS Now