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Wide Input Range, 3.3V SEPIC Converter Can Operate from 3V to 36V (Cold Crank)

Wide Input Range, 3.3V SEPIC Converter Can Operate from 3V to 36V (Cold Crank)

While requiring 6V to start up, the addition of a diode tied from output to input allows this circuit to operate as the battery sags all the way down to 3V. This wide input voltage range is required for automotive cold crank applications. The LT3581 is a PWM DC/DC converter with built-in fault protection features to aid in protecting against output shorts, input/output overvoltages, and overtemperature conditions. The part consists of a 42V master switch, and a 42V slave switch that can be tied together for a total current limit of 3.3A.