This circuit can be used for high voltage (100V max) and high current (33.6A) high side load switching. P-Ch MOSFET,Q1 has been chosen as it as very low ON-Resistance. For high voltage switching, R1 and R2 help to limit the VGS not to exceed VGS max. Another option is adding Zener diode across Gate and Source. N-CH MOSFET, ON/OFF control is driven by small signal N-CH MOSFET, Q2. When ON/OFF CTRL is low Q2 is OFF. When it is high, Q2 activate lowering P-CH gate voltage via R2 which also limits the current.
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