With a large input capacitor, even when the input is powered off for 1 second, there will still be a voltage of around 2V at Vin pin of the MAX17502. With Vin connected to EN directly, the voltage at EN will also be 2V after it is powered off. The EN voltage of 2V will keep the internal logic part of the chip in operating state, and the powering up at this moment will result in delayed startup of output voltage. Two voltage divider resistors can be added to EN/UVLO pins to pull down the voltages at EN/UVLO. It is recommended that you use the voltage divider resistors of 3.32M ohm and 866M ohm, so that even if the input voltage is 2V, the voltage at EN will be lower than its threshold voltage of 1.218V, such that there will not be any delayed start.