LDO for a temperature sensor

Brennan

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

over 16 years ago

0 Scot Lester over 16 years ago

TI__Expert 5640 points

There is also the TPS79733 (a fixed 3.3V output) which has even lower quiescent current but does not have a 5.0V output version.

0 Brennan over 16 years ago in reply to Scot Lester

Prodigy 235 points

That was quick. Thank you Scot for the suggestion. I'll look at this very soon.

0 Brennan over 15 years ago in reply to Brennan

Prodigy 235 points

Quick update: We chose the TPS715XX family for our LDOs. The 5V and 3V components are now working as specified in the datasheets.

Thank you for the support so far.

Cheers,
Brennan

0 SUCHITRA BHIDE over 15 years ago in reply to Brennan

Prodigy 230 points

have you tested the tps71533 for temperature variation. What I am observing is for a load of @ 5 ma the LDO output tends to change from 3.31 to 3.34 volts when temperature is varied from about 26 degrees to 60 degrees.

is this expected?

thanks

suchitra

0 Scot Lester over 15 years ago in reply to SUCHITRA BHIDE

TI__Expert 5640 points

The 30mV change in voltage due to temperature works out to a 0.9% change. The TPS71533 has an output voltage accuracy of +/-4% over line, load and temperature with most of the variation related to temperature. The 0.9% change would not be considered abnormal.

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LDO for a temperature sensor