LTM8029 effcient shutdown?

We need to shutoff a LTM8029 for a lower power mode feature in the device we are designing, the LTM8029 datasheet states to pull the run pin low to disable the device. I am looking for ideas how to pull this pin low in the most efficient way possible, i have access to a micro controller that can send a enable/disable signal but I am in need of some type of open-collector device to put in between the micro-controller and the LTM8029 to pull the RUN pin low without wasting current, needs to be in the <1uA range. Thanks

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