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BQ25150EVM: Questions about LDO & Vdd

trog
Prodigy 40 points
Part Number: BQ25150EVM
Other Parts Discussed in Thread: BQ25150

Hello,

BQ25150 has two LDOs :

- an always on Vdd 1.8v LDO <10mA.

- a 150mA LS/LDO which is active by default at 1.8v (e.g. without/before I2C use).

Question 1 : Why setup two LDO's active by default with the same output voltage ?

Question 2 : as 10mA (Vdd max current) is not enough to supply a MCU, what is the exact purpose of Vdd ?

Question 3 : planning to supply a MCU with a voltage other than 1.8v, in my understanding the only way is to add another external LDO wired to PMID. Do you confirm ?

Question 4 : as for BQ2512X, is there any plan to release BQ2515X with different Vldo default values ? (off, 1.8v, 2.5v, 3.3v...)

Thank you

  • 0
    TI__Genius 12485 points

    Hi Trog,

    Currently we see a lot of systems demanding a 1.8V rail for dedicated LDO that is turned OFF/ ON. So you see the LS/LDO default to 1.8V. 

    The VDD is an internal rail used by the chip and we made it optional to connect external loads on to it. Please note that VDD loads need to be low. 

    Some applications can use the VDD as a reference or a mic-bias voltage in their system or use it to pull-up to 1.8V independent of the LDO. 

    You will need to connect VINLS to PMID and not LDO pin itself. If VINLS is connected to PMID, you can do an I2C write to turn the LDO to any voltage within the register setting. 

    We have different VSYS voltage options on the BQ2512X but I can contact you offline to see what you would need. 

    Regards,

    Gautham