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BQ25606: BQ25606 charge circuit is not working

Pallati Srikanth
Prodigy 30 points
Part Number: BQ25606

  • 0
    TI__Mastermind 25800 points

    Hey Pallati,

    I have three comments for your schematic:

    1) Are you using a thermistor connected to the TS pin of charger that is not shown here? If not, you need to adjust the resistor divider network. 

    2) I would add a DNP/DNI RC snubber on SW and a DNP/DNI 1nF capacitor on PMID. This would be to help improve any layout related EMI.

    3) I would add a zero-Ohm resistor between the BTST pin and the capacitor, for the same reason as (2).

    Regards,

    Joel H

  • 0 in reply to Joel Hernandez II
    Prodigy 30 points

    Hi Joel H,

    I was done changes as your suggested, but the STAT LED Blinking (ON/OFF) when battery not connected. When battery is connected voltage at BAT pin was 4.2V. 

    what is the status of STAT LED and PG LED while charging and fully charged.

    anything wrong with this circuit, please suggest.

    Regards

    Srikanth.P

  • 0 in reply to Pallati Srikanth
    TI__Mastermind 25800 points

    Hey Srikanth,

    What frequency is the STAT LED blinking on and off? 

    As mentioned earlier, the TS pin network you have set up is expecting a 10-kOhm thermistor. Without that, you are likely in TS COLD, which disables charger and signals a fault on STAT @ 1Hz frequency.

    Keep in mind, if the TS network is valid for TS NORMAL, AND no battery is connected, the charger will move between the charge in progress and charge termination cycles, which also makes the STAT pin blink, typically at a faster rate (~2Hz). 

    Regards,

    Joel H