I am wondering what is the specific definition of ISW? Is it the peak current of Q2, Q3?
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As Ning mentioned ISYS is the output current. The ISYS spec in the datasheet refers to the maximum current the buck converter (made up of Q2, Q3, and external inductor) can output to the system load and battery.
The current observed at SW pin (ISW) is the inductor current.
You can think of ISYS and ISW as both referring to the output current capability of the buck converter.
I'm a bit confused about the description "SYS Output current (SW)"
I agree this line is a bit misleading, it says (SW) because the 4A max refers to the current draw at both SYS pin + BAT pin during charging.