MAX6495 Overvoltage Limiter

To protect downstream circuits from overvoltage conditions that show up during load-dump events or transients, we can use the MAX6495–MAX6499/MAX6397/MAX6398 overvoltage protection (OVP) devices. Here’s the circuit diagram:

This devices work by controlling an n-channel MOSFET wired in series with the power rail. The gate pulls low and the MOSFET shuts off, disconnecting the power rail when the voltage surpasses overvoltage threshold which is defined by user.  [Source: maxim-ic.com]