A synchronous Buck voltage regulator accepts an input voltage to provide a
regulated output voltage to an information handling system processing
component, such as a CPU. Input voltage is regulated by a control MOSFET,
a synchronous MOSFET and a regulator controller that controls the output
by controlling the control and synchronous MOSFETs. The synchronous
MOSFET handles overvoltage events output from the control MOSFET by
interfacing an inductor-capacitor tank circuit to reduce the overvoltage.
A negative voltage protection MOSFET driver associated with the regulator
controller monitors for negative voltage events that result from the
interfacing of the inductor-capacitor tank circuit and selectively
decouples the inductor-capacitor tank circuit if the negative voltage
event is associated with a predetermined condition. The negative voltage
protection MOSFET driver maintains the interface of the
inductor-capacitor tank circuit if the overvoltage event is associated
with a failed control MOSFET.