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BQ24610: damaged to SRN SRP

Keith Keller
Expert 6860 points
Part Number: BQ24610

Hello,

We have been testing out a bq24610 design and finding the devices are being damaged approximately 30 minutes after power up. The boards tested OK in production, but during assembly and calibration of the system the boards started to fail.

After removing the IC we found SRN and SRP has low impedance to ground (21 ohms versus 245K for correlation unit).

Since the SRN & SRP are connected to the output, it didn't' seem like ringing on the phase node would cause this damage.

Have you seen this failure mode before?  Thank you, Keith

  • 0
    TI__Mastermind 24075 points

    Hi Keith,

        Is the IC being damaged, or just the series sense resistor between SRP and SRN, or specifically any of the external components comprising the switching circuit? The only relevance that the 30 minutes after operation, is that there is an inbuilt 30 minute precharge timer (VFB<VLOWV and charging in precharge), however in that case the charger would turn off and indicate a fault condition. I have not seen this before.

  • 0 in reply to Kedar Manishankar
    TI__Expert 6860 points

    Hi Kedar,

    We reviewed the layout and found some optimizations we could make.

    In particular we need to have a split analog & power ground planes (like the user's guide layout) & relocate the input capacitors right at the high-side mosfet.

    We'll let you know if we need more help.  Thank you, Keith