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BQ76940: schematic review help

Bruce li
Genius 5580 points
Part Number: BQ76940

Dear TI Experts,

My customer is designed BQ76940 in their project, they find that 0.3% of BQ76940 are broken after all the manufacture process. The phenomenon is impedance between VC0 and GND very small while normal chips are huge. They suspect ESD cause this but they can't find  Could you kindly help to review the attached design and give some advices? Thanks a lot.

BQ76940.zip

  • 0
    TI__Guru 54715 points
    Hi Bruce,
    I don't see any reason the VC0 would be damaged. The pin is held to VSS by the capacitor and Schottky diode. A positive voltage would not seem possible with R73 = 0. If some test system or unexpected contact applied a voltage across RF17 a high positive voltage could be applied to VC0.
    Larger capacitors are typically used for C43, C44, and C46, but these should have no impact on VC0.
  • 0 in reply to WM5295
    Genius 5580 points
    Dear WM5295,
    Got it, thanks a lot for your timely support.