I would appreciate your answer.
Hi, in LT8490, you can choose between the solar power and the DC supply power charging by connecting VINR to a resistive voltage divider or ground, respectively. The MPPT function is disabled in the latter configuration. It would just appear as if the voltage is always at maximum power point. Take note that lower input voltage would require a higher input current. Thus, when using a DC supply power charging method, you should set an input current limit as indicated in page 19 of the data sheet.