• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 407 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25895M: BQ25895M PMID question

Gary Gaooo
Intellectual 775 points
Part Number: BQ25895M

Hi TI experts,

Boost Mode is required for the BQ25895M application.There are the following questions:

1. Can PMID be used as a function similar to DCDC to power other circuits?

2. Can PMID set fixed 5V(or other voltage)?

3. When the application product is wired + wireless function, how to switch between wired (USB power supply) and wireless (lithium battery power supply), PMID can output fixed 5V(or other voltage)?

  • 0
    TI__Guru**** 166996 points

    Hi Gary,

    First, the charger operates in either boost mode, providing 5.XV to PMID, or buck charge mode, when power is applied to VBUS.  PMID is not regulated to 5.X V while VBUS is applied.

    Regarding 1, yes. In boost mode, PMID is output of a voltage regulating boost converter that is powered by the battery.

    Regarding 2, yes, using I2C you can be set PMID to 4.55V – 5.51V with default 5.126V.

    Regarding 3, if you by wired and wireless you are referring to the USB cable being applied to VBUS or not the yes, however, there is a 30ms delay from boost mode turn on (VBUS removal assuming OTG bit and pin are high) and PMID regulating to 5.0V.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Intellectual 775 points

    Hi Jeff,

    thanks a lot

    so when VBUS is 7V，the PMID output 7V？

  • 0 in reply to Gary Gaooo
    TI__Guru**** 166996 points

    Hi Gary,

    Yes.  There is only a FET between VBUS and PMID.  It is used for reverse blocking and current sensing.

    Jeff