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BQ24735: Issue of PMIC

Murali Ravula
Prodigy 40 points
Part Number: BQ24735

Hi,

We are using BQ24735RGRT PMIC in one of our projects.

We performed required tests on PCBA like measuring current on various rails, outputs of regulators used in our design.

the PMIC (BQ24735RGRT) output used as sys voltage and is voltage used as input voltage to the rest regulators (As we are generating different voltages within using buck regulators like 1V8,3V3, 5V..etc),

After 2 days, I tried to turn ON PCBA, where I could not see that required voltages not generated, then I tried to find the issue, but I observed that that BQ24735RGRTit supposed to generate some voltage on pin No 4, around 15V-16V but this was not generated.

Next step unknowingly I touched PMIC then I Observed that it was working as intended, then i measured voltage at Pin No 4 and observed that the voltage as 17V.

I tried turning OFF and ON again faced the same problem.

Now the issue is that unless placing finger on PMIC which on PCBA, PMIC is not working.

I request you if any one of you faced the similar issue, please suggest how to resolve the issue.

Regards,

Murali Ravula 

  • 0
    TI__Genius 12415 points

    Hello Murali,

    I have a few questions:

    Murali Ravula said:
    the PMIC (BQ24735RGRT) output used as sys voltage and is voltage used as input voltage to the rest regulators (As we are generating different voltages within using buck regulators like 1V8,3V3, 5V..etc),

    Are you sayng that the device was working, but now it is not?

    Have you tried to reflow the solder on the IC to ensure that all of the pins are making a connection?

    When this fault is  occuring is ACOK high or low?

    Best Regards,

    Christian

  • 0 in reply to Christian Moyer
    Prodigy 40 points
    Hi Christian,
    Thank you for your email and your query.
    Please find below.

    Are you saying that the device was working, but now it is not?

    • Yes, a week ago it was working properly, from last 3 days i was facing this issue. 

    Have you tried to reflow the solder on the IC to ensure that all of the pins are making a connection?

    • Yes, when I observed this issue, I tried touchup of pins with a solder, but I could see the same behavior. 

    When is this fault occurring is ACOK high or low?

    • Observed, when ACOK Low , but observed that ACDET as 2.4V 
  • 0 in reply to Murali Ravula
    TI__Genius 12415 points

    Hello Murali,

    The ACOK pin needs to be driven high to turn on the ACDRV pin.

    The charger needs to meet all of the conditions in order for the ACOK pin to be driven high.

    If the charger meets all of these conditions and still does not work, the device might be damaged and needs replaced.

    Best Regards,

    Christian.