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BQ24278: BQ24278 charging current

Smit Sureja
Prodigy 10 points
Part Number: BQ24278

Tool/software:

Hello,

In all power bank ICs or battery charging ICs, there is an lim resistor that sets the maximum charging current. If I set it to its maximum limit, say 2.5A for the bq24278 IC, and the input power adapter (5V) can only deliver 1A, what will happen? Will it charge at the power supply's capability of 1A, or will it be considered a short circuit, causing the power adapter to shut down its output?

  • 0
    TI__Guru** 104030 points

    Hello Smit,

    Due to the U.S. holiday our response will be delayed, we will respond by end of day tomorrow CST.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Genius 13905 points

    Hi, 

    This depends on your load and charge current. If your load + charge current demand exceeds needing 1A from your input then it is likely your power source won't be able to supply the demand, causing the voltage at IIN to drop. Eventually it will drop to the confgured VIN_DPM voltage. At this point no additional current will be pulled from your power source. This means that charge current will be reduced to supply SYS current and, if necessary, the battery will supplement to provide system load current requirements.

    Best Regards,

    Juan Ospina