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BQ25505: How do we control the charging temperature with this chip BQ25505?

Frank Su
Prodigy 10 points
Part Number: BQ25505
Other Parts Discussed in Thread: BQ25100, BQ24210

We use your chip BQ25505 chip as our solar charging IC for our recharging battery.  This chip is in our mass product now. But with some new regulations, We need control the minimum and maximum charging temperature. And we noticed that there is a temperature sensor in your chip. Is there a way to have a cut off charging control with your temperature sensor?

if the answer is no, Could we serially connect your chip to another USB charging IC. This USB charging chip have a charging control unit. if we cascade your chip with another charging IC together, is there something we should know before we cascade two steps charging design? 

Thanks all for your helps in advance.

  • 0
    TI__Guru*** 148505 points

    Hi Frank,

    The BQ25505 does not start/stop charging based on battery temperature but will stop charging if the IC die temp rises to 125C temp.  You could use the BQ25505 as a boost converter, tying VSTOR=VBAT with at least 100uF on VBAT.  Then connect a linear charger with VINDPM feature to VSTOR=VBAT.  I recommend setting the BQ25505's VBAT_OV value to slightly above the charger's VINDPM setting.  The BQ24210 has adjustable VINDPM but it is likely oversized for your application.   The BQ25100 family has fixed VINDPM at 4.31V typical and might work if you can use chipscale package.

    Regards,

    Jeff

  • +1 in reply to Jeff F
    Prodigy 10 points

    Thanks a lot Jeff