I'm designing a PCB that is powered by this solar charger using a 3.7V LiPo battery (maybe I'll have to move up to a 4.2 battery). I want to regulate that voltage to 3.3V for feeding a microcontroller and I've selected a TPS73633DBVT, this is a LDO voltage regulator with fixed 3.3V output and 75 to 200mV dropout voltage.
The datasheet says that I can connect the enable to vin if I don't need it but it also says that stuff could happen if I remove the battery from Vin, which is what I can't understand. It says:
When shutdown capability is not required, EN can be connected to VIN. However, the pass gate may not be discharged using this configuration, and the pass transistor may be left on (enhanced) for a significant time after VIN has been removed. This scenario can result in reverse current flow (if the IN pin is low impedance) and faster ramp times upon power-up. In addition, for VIN ramp times slower than a few milliseconds, the output may overshoot upon power-up.
Could someone please explain me what this means and how can I avoid damage when the battery is removed?