I'm designing a circuit that will run from 3V battery. The battery can get as low as 2V and I want to use it as much as I can.
I'm using a PIC24 that operates with the integrated regulator for VDDCORE disabled with a VDD from 2.0V to 3.6V but VDDCORE goes from 2.0V to 2.75V max, so I can't power the microcontroller directly from the battery as I will be exceeding the VDDCORE allowed voltage.
I'm planning to use an LDO as the
MCP1703 with an output voltage of 2.5V to power the microcontroller VDD and VDDCORE. My current consumption won't be higher than 50mA. My question is, when the battery voltage goes below 2.5V (plus the dropout voltage) will the regulator act as a switch bypassing the input voltage to the output plus a dropout? How high would be the dropout?