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BQ24640: Inquiry on temp range

Jade Han
Intellectual 1595 points
Part Number: BQ24640
Other Parts Discussed in Thread: BQ24610

Tool/software:

Hello team,

Currently my customer is reviewing BQ24640 for their AC

1. Is below image's temp range (0~45‘C) set by the R9, R10 resistors on TS pin?

2. Why does the application example limit the IC operation temp range to 0~45‘C? Is it for the battery?

Thank you in advance for your help and support.

  • 0
    TI__Mastermind 20570 points

    Hi Jade,

    1. Yes, the charging temperature range is set by those two resistors.

    2. it is not the IC operation temp range. It is the temperature range set by the TS pin which is the battery charging temperature range. 

  • 0 in reply to Jing Zou
    TI__Intellectual 1595 points

    Hi Jing,

    Thank you so much for your feedback! I had a quick follow-up question from my customer,

    They said that super caps, unlike normal batteries, do not have very limited operating temperature.

    For example, the super cap they are using has operation temp of -40℃~80℃. They asked, why super cap chargers like BQ24640 has such a feature, that limits the temp range. May I ask why?

    Thank you for your help and support.

    Best regards,
    Jade

  • 0 in reply to Jade Han
    TI__Mastermind 31976 points

    Hello Jade,

    This is a legacy device, so we have limited background information regarding the decision to use a 0–45°C temperature range. From what I understand, the BQ24640 was developed as a variant of the BQ24610. Since the BQ24610 is intended for lithium-ion batteries, it’s likely that the temperature detection in the IC was reused without significant changes.

    Best Regards,

    Christian

  • 0 in reply to Christian Moyer
    TI__Intellectual 1595 points

    Hi Christian,

    Thank you so much for your feedback.

    Customer hopes to remove NTC and use 430kohm for TS pin resistor as below image.

    Would this be ok? From datasheet I assumed it may be ok, but I wanted to double check with you.

    Thank you for your help and support.

    Best regards,
    Jade

  • 0 in reply to Jade Han
    TI__Mastermind 31976 points

    Hello Jade,

    Jade Han said:

    Customer hopes to remove NTC and use 430kohm for TS pin resistor as below image.

    Would this be ok? From datasheet I assumed it may be ok, but I wanted to double check with you.

    Yes, This is okay.

    Best Regards,

    Christian