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BQ25120A: Questions about PMID & VINLS

Ha Uk Chung28
Prodigy 60 points
Part Number: BQ25120A

Hi,

I am trying to use BQ25120a, but came to confusion regarding PMID and VINLS pins. From the datasheet, VINLS pin is connected with SYS and I assume this is the output from internal buck converter. But, I also found other schematics in evaluation board that connects PMID with VINLS. So, here is my question. 

 1) If PMID left unconnected any pins, I found the datasheet says the output at PMID node is for unregulated load. What does this exactly means or how much voltage/current it draws? 

 2) What is the difference between two configuration 1) VINLYS connected to SYS and 2) VINLYS connected to PMID, SYS not connected to any of two. 

I look forward hearing the answer. 

Thanks,

Ha

  • 0
    TI__Genius 12485 points

    Ha,

    PMID is either between VBAT or VIN. You can connect other system peripherals and regulators to PMID that can withstand voltages from 3-5.5V. 

    VINLS is only an input to the LS/LDO. Depending on what voltage you need at the LS/LDO output, you can connect the VINLS to either PMID or VSYS. 

    Select the choice for high efficiency for the LS/LDO. The output of the LS/LDO can never be greater than the VINLS pin. 

    regards,

    Gautham