1. For the LP2992 device (assuming a 3.3V part), what happens if the input voltage is below 3.3V (but above the Vin minimum, which I believe is 2.2V). Will the Vout follow (track) the Vin, or will the regulator output be off (0V) ?
2. If the LP2992 does not operate in this fashion (ie: output tracks input when Vin <= Vreg), then is there some other LDO which does behave this way ?