I have been investigating the use of an LTC2912 device to monitor a supply voltage in my design. In my LTspice simulation I have included the LTC2912 model and I have the LATCH_n signal tied to GND. In my simulation the OV signal had been asserted due to an overvoltage on the input, as expected, but I noticed that the OV signal would not deassert after powering VCC down then back up again. Checking the same simulation with the LTC2914 model instead, the OV signal was deasserted after power cycling. We know the LTC2914 is expected to release the OV latch after power up since we regularly test this in production for one of our other products. Therefore, I suspect it is either the case that: A) the LTC2912 does not have the same internal OV latch behaviour as the LTC2914 and therefore will not release the OV latch after power on, or B) the simulation model for the LTC2912 is wrong and does not properly simulate the OV latch resetting. Can someone please clarify which of these cases are correct, if either? I have packaged a couple of LTspice simulations which demonstrate this behaviour for both devices.LTC291x OV Latch Reset Behaviour.zip
LTC2912 Simulation:
LTC2914 Simulation:
