vout nevertheless the buck remains enabled and provides power to the system as long as v in gt v out i e the buck converter is in the buck_on ramp down state 52 in phase 38 v in drops eventually below v out and the buck converter is disabled i e the buck converter is in the buck_off state 50 due to the described procedure the buck converter will automatically adjust the input current limit to the output resistance including cable interconnect resistance of the power source preventing interruption of the power flow in the case the supply voltage is plugged out the buck converter will first try to minimize the current drawn from the power source and will be only turned off when vin lt v out therefore under all circumstances the buck converter of the present invention will maximize the power delivered to the system by remaining active for the maximum possible time i e until v in lt v out summarizing the described invention addresses particularly the case in which the current drawn from the system albeit being lower than the current limit programmed for the specific power source causes the input voltage v in to drop below input threshold voltage v in u2014 low mainly because of the connection cable resistance or the low quality of the power source in this case the control loop presented above insures 1 that the buck converter or in general the.