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BQ24040: Please review the schematic

Chase Jeong
Genius 5900 points
Part Number: BQ24040

Hello TI experts,

could you please review the schematic below?

and I have one question.

LTST_C195KG is red-green LED for notify the charger status for user.

when CHG is high, current will flow from CHG pin to GND. so it will need current for operate LED.

here is the spec of LED;

could you check that the current from CHG pin is enough to operate LED or not?

please check these 2 issues. Thanks.

Best regards,

Chase

  • 0
    TI__Mastermind 23220 points

    Hi Chase,

    From the schematic, I do not see any major issues. 

    It looks like the following is configured:

    • Fast Charge = 790 mA
    • Pre-Charge = 15 % of Fast Charge = 118 mA
    • Termination = 7.5 % of Fast Charge = 59 mA

    I am not familiar with the LTST_C195KG part. Be aware that the /CHG is a an open drain status output. When /CHG is high , it is due to an external source such as OUT as shown below and is actually high impedance / open drain.