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BQ24032A: Connecting the battery to the IC does not power up the circuit.

Maximilian Majchrzyk
Prodigy 20 points
Part Number: BQ24032A

Hello,

we are using the BQ24032A as a power managment chip in our latest product, which is currently at the end of prototyping phase. Some of our last problems have to be fixed and one of those is the following:
If i am connecting the battery to the IC, with no other supply connected, the IC does not power up the circuit of the remaining application. If i am now connecting a USB cable for charging, the IC begins to power the circuit properly. Also charging is working correctly and STAT LEDs behave as mentioned in the datasheet. We also own an EVAL Board, where the error does not occur but we have less consumers attached to power-out there. Our current circuit will be attached as a picture. 
Additionally worth mentioning is that we encounter the strange behaviour of the battery powering-up the device as a standalone power source by approx. 1/50 times (plugging it in and out). If the circuit is powered up (with help of USB) i can remove the USB cable and the battery works fine as a standalone power supply - the problem only affects the powering-up phase. 
The consumers connected to the POWER_OUT signal need approx. 400-500 mA (accumulated).


Maybe you have some ideas what causes this problem ? 


Best Regards,
Maximilian Majchrzyk

  • 0
    TI__Mastermind 21590 points
    Hello,
    Can you please post scope shots of VBAT, VOUT, VDPPM and IBAT.
  • 0 in reply to Raheem
    Prodigy 20 points

    Hello,

    thank you for your fast answer.

    I have prepared the shots from VBAT, VOUT, VDPPM and measured an IBAT of ~231mA (with some semi-periodic immeasurable peaks when the multimeter displays an overload).
    These measurements were done while the circuit was not powered up and the battery was attached as a standalone power-source.

    Pictures with short description attached below.

    Thank you & Regards,
    Maximilian Majchrzyk

  • 0 in reply to Maximilian Majchrzyk
    TI__Mastermind 21590 points
    Hello,re
    I've tried this in the lab and i can't replicate this issue. The device acts as a passthrough when in BAT only mode so there shouldn't be any problems in this mode. Can you try removing the 500mA load and see if this issue occurs. Also try replacing the battery with a source-meter and check if this issue persists. Also it would be helpful to see a scope shot of the output current and VOUT at the same time.
  • 0 in reply to Raheem
    TI__Genius 10240 points
    Maximilian,
    I haven’t heard back from you, I’m assuming you were able to resolve your issue. If not, just post a reply below or create a new thread if the thread has locked due to time-out.