• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 353 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.

BQ25504: Changing the PV cells by a non-rechargeable battery

Renato
Intellectual 675 points
Part Number: BQ25504
Other Parts Discussed in Thread: BQ25505,

Hi,

My product has to work with a regular battery or with a rechargeable battery and a PV panel by only changing a jumper or a switch.

So my idea was to have two modes:

 1. Changing the PV cells by a non-rechargeable battery and shunting the storage element to GND.
 2. The PMIC use the PV cells and the storage element.

Is possible to do this on the BQ25504 or BQ25505? If not, what is the best way to accomplish this?


Best regards.

  • 0
    TI__Guru**** 166576 points
    Renato,

    The BQ25505 automatically switches the VSTOR output, configured to power your system, between non-rechargeable battery and rechargeable battery based on the VBAT_OK threshold. When the rechargeable battery drops below the VBAT_OK threshold, presumably because the solar panel is not available or not providing enough power, the VSTOR output is switched to the non-rechargeable battery.
  • 0 in reply to Jeff F
    Intellectual 675 points

    Hi Jeff F,

    The BQ25504 don't have a VBAT_PRI, I can change the PV cells with a non-rechargeable battery or is not a good practice?

  • 0 in reply to Renato
    TI__Guru**** 166576 points
    Renato,

    If you asking whether you can use the non-rechargeable battery to power the charger at VIN_DC, then yes, as long as the battery at VIN_DC is less than the desired voltage set by the VBAT_OV resistors. The BQ255xx chargers are boost chargers and so the output voltage at VSTOR=VBAT(_SEC) must be higher than the desired input voltage.