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LMZM23601: how to disable LMZM23601 if customer configure LMZM23601 as a inverting regulator

Bill Xu
Intellectual 1080 points
Part Number: LMZM23601
Other Parts Discussed in Thread: PSPICE-FOR-TI

Hi, Dear product line 

my customer configure LMZM23601 as a inverting regulator as below figure shows.

then customer find he could not disable LMZM23601 with a FPGA_IO directly. Ithink the EN pin should refer GND of chip. So I propose custome use a photo-mos or optical-couple to disable/enable LMZM23601. but the photo-mos or optical couple is too big for customer since the PCB area is quite tight.  I also propose a zener/transistor for disable/enable. but I could not simulate it since Pspice-For-TI has no zener. Do you have any good idea? thanks. 

regards,

Bill