Can anyone explain the basic working of Low-Drop Voltage Tracker

Hello Hari,

Most LDOs have an internal voltage reference (some times called "Bandgap Voltage Reference") which is used to determine, along with other circuitry, what the output voltage of the LDO will be, for example TLV717 parts:

Source: TLV717 Datasheet

"Voltage Tracking" LDOs are a special case of LDOs where there is not an internal voltage reference, instead there is a pin available for the user to provide this reference, such it is the case of TPS7B4250-Q1:

Source: TPS7B4250-Q1 Datasheet

For more general information on LDOs and how the voltage reference is used to determine the voltage output, please see the "Technical Review of LDO Regulator Operation and Performance (SLVA072)".

Regards,
Victor