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Purpose of V[-] 2.2k Resistor in bq29700 Circuit

Charles Gervasi
Expert 2270 points

Can someone tell me the purpose of the 2.2k resistor in the bq29700 suggested circuit.



I'd like to know the tolerance on this.  I wonder if I can other values to reduce BOM line-item count on my board.  

  • 0
    TI__Guru 54715 points
    The resistor will provide some isolation of the pin from the PACK transients limiting current into the pin and provide a voltage drop across its bias current. There is no recommended range beyond the nominal value as you have noted. The part should function with a different value, but you may notice some shift in the Vshort condition where the 2.2k appears as a test condition.