Cap coupled level shifter... I don't have my schematic prog on this computer but it's not a complicated circuit.
Same as Fig 31 on pg 2-29, except that it's a PMOS so the Zener & pullup resistor go to Vin. I didn't put a regular diode in series with the Zener (5.1V) either- I'm not sure what that's for, ithe Zener would otherwise only turn on when the cap is charged too high (Vin dropped?) so that the positive side is above Vin, which is exactly when it SHOULD conduct to drain it.
That's a really outstanding link, great reference on ALL sorts of power transistor drivers.