I need something similar to the Texas Instruments TVS3300 but for a higher voltage. The TVS3300 is basically a drop-in replacement for a TVS diode that clamps the voltage using an internal mosfet and has a very small window between fully off and fully on.
My maximum working voltage is 60-65V (pref 65V) and I need a max clamping voltage of below 70V. I will use a discrete mosfet for the clamping. One option is to use a zener regulator directly driving the gate of an N channel mosfet. However this has a fairly wide window between off and on and a ~60V zener doesn't have a precise voltage, especially when driven at only a few microamps.
I understand the TVS3300 uses a comparator. Most comparators are only available up to 40V. How can I power a comparator so that it will activate fast enough to block a fast transient when the input voltage is otherwise 0V? An LDO will often have a small start up time.
I also need a low cost (below $1 USD), low quiescent current, preferably below 10uA and a very small footprint (pref lower than 10mm2 not including mosfet).