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A functional block diagram of the LT4356 surge stopper is shown in this slide. Under normal operating conditions, the LT4356 drives the gate of the N-channel MOSFET fully on to power the load with very little voltage drop. However during overvoltage or overcurrent conditions, the MOSFET is called into duty as a series limiter. If the input voltage rises above the regulation point set by the Feedback (FB) divider, the voltage amplifier (VA) drives the MOSFET as a linear regulator. This limits the output voltage to the prescribed value and allows the load circuitry to continue operating, uninterrupted. To protect the MOSFET and load from short circuits, the LT4356 includes current limiting which will be discussed shortly. When power is first applied, or when the LT4356 is activated by pulling the Shutdown pin high, the external MOSFET is turned on in a gradual manner by slowly driving the gate high. This soft start provides inrush current limiting to minimize the effects of dynamic loading on the input supply and reduces thermal fatigue in any upstream fuses. Once the MOSFET is fully on, the enable pin goes high to activate the load circuitry, such as a microprocessor or switching regulator.
