# Shutdown for LT3080 current source

I would like to use a LT3080 as a current source (see datasheet page 17 in Typical Applications Section). However, I need to be able to shut it off. Since $$I_{\text{out}}=10\mu\text{A} \times R_{\text{set}}/R_{\text{out}}$$ it seems just a matter of shorting $R_{\text{set}}$ with a PMOS. The problem is that for all PMOS devices I've reviewed the best I've found for zero gate leakage current is 1uA, and at high temperatures 10uA, so depending on the temperature it will suck all the current from the 10uA current source, thereby killing the output current when it is not supposed to.

I thought of using a PNP but the problem is that $V_{\text{ce(sat)}}$ will be comparable to the 0.5V-1V I intend to drop accross $R_{\text{set}}$, so it will not shut off $I_{\text{out}}$ effectively. The only solution I have at the moment is to shut off the input voltage. Any ideas?