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BQ76952: Internal LDO of BQ76952 vs External LDO

Lukas Simon
Prodigy 110 points
Part Number: BQ76952
Other Parts Discussed in Thread: BQ34Z100, , TPS7A43

Tool/software:

Hello TI Team,

what would be more effective and consumes less power with a BAT voltage of around 48V and an assumed load of only around 50µA (the idea is to connect the Fuel Gauge BQ34Z100 to the REG of the BQ76952)


1: The internal REG1 of the BQ76952 set to 3.3V with pre regulator in use


2. An external regulator of the type TPS7A43 (3.3V fixed version) with around 5µA quiescent current

I'm asking because i do not have enough information in the datasheet of the BQ76952 to compare the two solutions with each other. Also i don't know the current losses the pre regulation circuit inserts. 

It would be very helpful to get an answer to the question of which LDO solution is more effective and will consume less power. (Even if it is in the µA range, this information is important to me)

Thank you very much in advance

Lukas

  • +1
    TI__Genius 17755 points

    Hello Lukas,

    Section 7.12 REG1 LDO in the datasheet provides the best information of the current potentially from using REG1. We unfortunately do not have anything more specific.

    The best method is to probably test the current draw yourself with your system to see how much is actually drawn when using REG1.

    We do have a pin equivalent diagram as shown below that may help provide an idea as well.


    I am not familiar with the TPS7A43, so I recommend opening a new question directed towards the LDO team if you want further information regarding that part.

    Best Regards,
    Alexis

  • 0 in reply to Alexis_H
    Prodigy 110 points

    Hello Alexis,

    thank you very much for the provided information. I will run some tests to find out the real difference in current consumption. 

    Best regards 

    Lukas