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BQ24230 battery detect issue

Pepijn Herman
Prodigy 60 points
Other Parts Discussed in Thread: BQ24230

Hello all,

 

I am verifying a design with the BQ24230 li-poly power path management IC.

The charger works fine but when there is a faulty battery pack or no battery pack at all connected to the sytem the BQ24230 goes limp.

There is no power good when the USB is connected and the output voltage of the IC is about 1.7Volts while the input is 4.9Volts (standart USB connection).

Does anyone have any clue why this is?? I allready checked the Iset and Ilim values and they are both set just below 500mA. 

Best regards,

 

Pepijn

  • 0
    TI__Prodigy 720 points

    /PGOOD needs pull up votlage and pull up resistor. Its logic needs meet three comparators, it must > UVLO which is 3.4V max, it must < OVP which is 6.4V min, if input is in range like 4.9V then need check VBAT.

    Vin must > VBAT+VIN(DT)=VBAT+130mV max, when battery detection, there's small charging current, if dump energy to output capacitor, it may get VBAT > 4.2V which depends on output capacitor and parasitic inductance. Use a big capacitor at system output to try first to indentify the root cause.

    Usually without battery, the input still can power system.

    Also you can try pull TD high to disable termination, this makes VBAT a constant voltage 4.2V, then it should be able to power system. This is for  test purpose to identify if the VBAT voltage cause the issue.

    Use oscillascope to probe IN, VBAT, OUT voltage to debug.