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LDO for a temperature sensor

Hello.

I am looking for an LDO that consumes very, very low power (battery operated) and that has a fixed single output (+5V, +3.3V are the voltages I am considering for now).  It is going to provide power to a temperature sensor for a monitoring application. A battery would actually suffice but I am just preparing for scenarios where the battery output would not be stable anymore.

The TPS71550 and TPS71533 particularly caught my attention because these are designed to support MSP430 families, one of the components used in the project.  However, I would like to hear better suggestions from more experienced users in this forum.

Thanks,
Brennan