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BQ24073: BQ24073 IN/OUT current?

kwon
Intellectual 850 points
Part Number: BQ24073

In BQ24073 datasheet 8page [8.3 Recommended Operating Conditions],

 - Input current, IN pin : 1.5A

 - Current, OUT pin : 4.5A

 - Current, BAT pin (Discharging) : 4.5A

 - Current, BAT pin (Charging) : 1.5A

If both [Current, OUT pin : 4.5A] and[Current, OUT pin : 4.5A] are described, is it possible for both the battery and adapter to use 4.5A load?

The input current(1.5A) includes the system load and the battery charge current.

How can I use the output current up to 4.5A?

Then, after setting the input current(ILIM) to 1.5A, can I use the charging current of 500mA and the load current of 4A?

Thank you.

  • +1
    TI__Mastermind 23805 points

    Hi Kwon, 

    kwon said:
    If both [Current, OUT pin : 4.5A] and[Current, OUT pin : 4.5A] are described, is it possible for both the battery and adapter to use 4.5A load?

    For the BQ24073 the provided input current can be as high as 1.5 A as seen in the table on page 8 of the Data sheet. When the device is charging this current is shared between the OUT pin and the BAT pin (i.e. I-BAT + I-OUT cannot be larger than I-IN). Therefore it is not possible for both the battery and system load to use 4.5A. 

    kwon said:
    How can I use the output current up to 4.5A?

    Due to the device's dynamic power path management (DPPM) feature when the system load requires more than 1.5 A the device allows the battery to supplement the additional current required by the system load. For example, if the battery was fully discharged or disconnected you would only be able to provide up to 1.5 A to your output load, but with a charged battery you can provide up to 4.5 A to OUT pin as long as the battery has the capacity to provide the additional energy the system load requires.  

    Regards,

    Garrett  

  • 0 in reply to Garrett Kreger
    Intellectual 850 points

    Thank you for your answer.

    I thought so too.

    [Current, OUT pin : 4.5A] : There may be a misunderstanding that this phrase is 4.5A in the IN pin(adapter) path.

    Thanks.