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BQ25895: For PMID to supply boost 5V/3A

Beginner
Intellectual 2421 points
Part Number: BQ25895
Other Parts Discussed in Thread: PMP4496,

I am reviewing our reference design - PMP4496 USB-C DRP Power Bank With Fast Charger Input Reference Design.

http://www.ti.com/tool/PMP4496

BQ25895 is in this design but they use additional boost IC to replace original charger boost function. This causes my confused. 

Not sure what's this design consideration. I would like to check with you if we can remove boost IC - TPS61235 and MOSFET CSD25310*2.

It should be replaced by boost function by charger. My proposal is to connect OTG on GPIO of MCU and let PMID to apply 5V/3A on VBUS. 

Kindly correct me if anything is wrong. 

  • 0
    TI__Guru**** 166696 points

    Hello BeMyself,

    The BQ25895 can use its dc/dc converter as a buck converter to charge the battery from VBUS to BAT or as a boost converter to provide 5.xV from BAT to PMID, not both at the same time.  In this design, the OTG boost voltage needed to be applied back on the input (VBUS) rail not PMID.  In addition, there is a delay when changing from buck mode to boost mode. 

    Regards,

    Jeff