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Demonstration circuit 2658A is a 42V, 6A synchronous step-down second generation SILENT SWITCHER with spread spectrum frequency modulation featuring the LT8643S. The demo board is designed for 5V output from a 5.8V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8643S is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated bypass capacitors optimize all the fast current loops and make it easier to minimize EMI/EMC emissions by reducing layout sensitivity. Selectable spread spectrum mode can further improve EMI/EMC performance. Fast minimum on-time of 30ns enables high VIN to low VOUT conversion at high frequency.