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BQ24072: BQ24072

Suthan G
Prodigy 20 points
Part Number: BQ24072

Hi Team, 

We have been using BQ24072 for almost the last 10 years. We have a temperature monitoring device. In the battery working condition, the temperature accuracy is almost 0.5 deg C, but on charging time we face 5 to 8 deg C. This is a problem for us. Our main goal is to achieve both battery and charging condition error +/-0.2 accuracy.

1) In charging time, why heating too much? 
2) How to reduce heat? 
3) Our charging circuit is below. Please check.

  • 0
    TI__Mastermind 23220 points

    Hi Suthan,

    Welcome to E2E! Glad to hear you've been using the BQ24072 for 10 years! Can you elaborate more on your goal? It sounds like you want the battery temperature to be the same in both conditions, is that correct? Before I answer your questions, I just want to double check that you are referring to the IC temperature? Or are you referring to the battery temperature?

    Best Regards,

    Anthony Pham

  • 0 in reply to Anthony P Pham
    Prodigy 20 points

    Hi Anthony,
    Thanks much for your reply!
    In charging time IC getting to much heat 45 to 50 deg C because of this our Temperature sensor showing different temperature. How to reduce IC Heat. 

  • 0 in reply to Suthan G
    TI__Mastermind 23220 points

    Hi Suthan,

    Thanks for the clarification! Due to the nature of the BQ24072 being a linear charger, there can be a lot of heat due to the power dissipation. Some ways you can reduce the heat is as follows:

    1. Reduce overall current flowing from IN to BAT pin (charging or system load)
    2. Provide large copper pours for head dissipation along the power traces

    Best Regards,

    Anthony Pham