I am trying to design a board with USB powered linear battery charger IC charging a 3.7v Li-ion battery. I am concerning about the the relationship between charging path resistance and the maximum charging current. The overall resistance include: USB cable resistance; USB connector to the actual USB input pin on the charger IC PCB trace resistance; I am also consider to add a OVP IC which additionally contributes about 200mOhm. From my understanding of linear charger, the maximum charging current(in constant current charging) will not decrease until the pass transistor saturates. So I think if I leave a voltage more than 0.3v for the pass transistor, the charging current will not be influenced by the input resistance.
If the transition voltage between constant current and constant voltage for the battery is 4.1v, the maximum charging current is
(5v - 4.1v - 0.3v)/(Rcable + Rtrace + Rovp).
Is my understanding right?