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BQ24133: BQ2413 output abnormal

Part Number: BQ24133


Something is wrong with my circuit.

Input voltage VIN=13V, set 3 battery output. The measured no-load output voltage is only 7.4V, and the measured voltage at pin 14 is 3.3V. Please help me review the problems in the circuit, thank you very much

  • Hi Alon,

    What is the STAT pin reporting?  If the battery is close to the termination voltage (12.6V), the charger might be in sleep mode since input voltage = 13V-Vdiode=0.6V = 12.4V is less than the battery voltage.  The input voltage must be at least 200mV above the final battery voltage for the charge to be able to fully charge the battery.


  • Hi Jeff,

            The LED on the STAT pin is blinking, it does not seem to be a problem with the input voltage, the test input is 14V, and the input is only 7.4V. thanks.

  • HI Alon,

    Blinking STAT means one of the faults below:

    I recommend checking the following pin voltages for the following faults:

    charge suspend: TS is at the range below:

    charge suspend: ACSET > 0V should be okay since ACN=ACP   

    input overvoltage: OVPSET is at desired voltage

    battery absent: confirm that SRN isn't pulsing like shown below

    battery overvoltage: CELLS pin is high

    Below is a design spreadsheet that might help with double checking your resistor values: