Can not turn on ADP5073

Hi, 

I have some problem with ADP5073.

I tried to get a Vout = -10v, with VIN = 3.3V using the circuit in datasheet.

I gave VDD  (I tried 3.3~5V) and found that VREG was about 0.3V.

It means that I can not turn on the regulator.

I tried to send a 3.3v to EN pin, however, I found that the EN pin has a 0.5v output voltage.

I thought that EN pin suppose to be an input pin.

Does anyone have a suggestion?

Thanks.

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