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BQ24610: BQ24610 and lower drive MOSFET blow apart when battery voltage is applied without an adapter source

Jerry Mueckl23
Prodigy 50 points
Part Number: BQ24610

My company is using the BQ24610RGE Battery Charger using a circuit very similar to that of Figure 19 in the bq2461x data sheet.  The issue we experienced twice is that if the battery is plugged into the circuit before applying adapter power, the low switching MOSFET (Q5 in Figure 19) and the BQ24610 blow in a visible, disastrous way.  It would probably have happened much more often if we did not take care to be sure the adapter AC power was applied first. While the upper MOSFET (Q4) appears to be okay after the blast, the drain, source and gate of the lower MOSFET are all shorted together.  This has happened two times to us, and we have done nothing different other than not applying adapter power before connecting the battery to the charger output. 

I want to know if this has been seen before, and what can be done to prevent the problem.

The battery pack I am charging with this circuit is a six cell THOR model 45C 6S 22.2V 3300mAh Lipo. 

I am attaching the circuit we have implemented on our board.  

  • 0
    TI__Genius 10640 points
    Hi Jerry,

    Your design follows our EVM design basically. And you are using the same low side MOSFET as our EVM.
    Did you plot any waveform before/after this issue?
    How often this issue occurs? Or every time you plug-in battery when adapter is absent, it would occur?
    Could you please help to plot the VBAT, IBAT, PH to see if there is any abnormal phenomenon occurs when plug-in battery?

    Thanks,
    Ann Lien