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BQ24195: Heating issue

Part Number: BQ24195

Hi everyone!

I am using the BQ24195 chip within a powerbank application and I can't help but notice that the inductor heats up till around 65 degree during PMID operation.

The performance of PMID hovers from 4.95V (load condition) and 5V (unloaded condition)

Following the datasheet schematic, i did not connect any load to SYS as i have my own external 3.3V regulator for my microcontroller.

As my prior inductor used is SRP2512-2R2M (peak current around 3A), I felt the saturation current was the issue why the inductor was heating up and thus, i have changed it to the one on the evaluation board : IHLP2525CZER2R2M01 (8A RMS, 14A peak)

However, the heating issue is still present at 60 deg.

Do you have any suggestions for me to resolve this issue?

I am unsure if the inductor on the evaluation board reaches this temperature itself as I do not have one.

Best Regards!

A Curious Electrical Engineer

  • Hi,

    Is the device soldered down correctly with thermal pad?

    Thanks,

    Ning.

    Please click "This Resolved my issue" button if this post answer your question.

  • Hi,

    Yes the device is soldered down correctly with 4 big thermal pads instead of 9.
    As the heat seems to be isolated at the inductor, the BQ chip doesnt heat up.

    Although my layout did not precisely follow the example layout due to space constraints and I have the inductor slightly further away. As I provided sufficient copper width for the inductor connection, I would believe that the copper does take in some parts of the heat but not everything.

    Even so, as the operational and saturation current is below the recommended inductor Irms current, i would expect that the heat will be little to none, correct me if i'm wrong, as the power loss over the inductor should be very small.

    Best Regards,
    Wee
  • Wee,

    The inductor power dissipation depends on the output inductor specs. Since only the output inductor is overheated, it is better to check with the inductor vendor.

    Thanks,

    Ning.
    Please click "This Resolved my issue" button if this post answer your question.