The L4975A is a 5A output current, 5.1V to 40V output voltage range, 0 to 90% duty cycle range step-down monolithic power switching regulator that has internal feed-forward line regulation, internal current limiting, precise 5.1V ± 2% on chip reference, reset and power fail functions, soft start, input/output sync pin, under voltage lock out with hysteretic turn-on, PWM latch for single pulse per PE-RIOD, very high efficiency, switching frequency up to 500KHz, thermal shutdown, continuous mode operation.