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BQ76930: BQ76930 VC0, VC1 damage

Star Xu
Genius 9645 points
Part Number: BQ76930
Other Parts Discussed in Thread: STRIKE

Hi 

The customer design with two BQ76930, the 20S1P (18650) battery management solution was made by cascading; during the mass production of battery packs, some main circuit boards were damaged.

The high-side BQ76930 is damaged, the VC1 and VC0 pins are shorted.

What causes the damage of VC1 and VC0 pins?

Waiting for your reply.

Thanks

Star

  • 0
    TI__Mastermind 42070 points

    Hello Star,

    It is difficult to know exactly why these pins were damaged. When exactly in the manufacturing process was these discovered to be damaged?

    It may be the way the cells are being attached, for best robustness they should connected starting from the bottom of the stack. They may want to add a Zener/Schottky diode on VC0 to protect the pin from too low or high voltages (This pin is a low-voltage pin). 

    Additionally, it may be good to read Section 10 Random Cell Connection – Within Limits of the bq769x0 Family Top 10 Design Considerations application note.

    It could also be that there was an ESD strike, were there ESD considerations done in their schematic/layout?

    We have a stacked reference design that could be used as reference: TIDA-01093

    Best Regards,

    Luis Hernandez Salomon