This chip has multiple features tied together and designers of UPS,inverters also can benefit. If this chip could be combined with a digital technology with a simple user interface to program various parameters of currents and voltages then it will be more easy to incorporate into many systems.
It's a somewhat simplistic view of maximum power point tracking and would apply to one panel, at one temperature. It would not achieve anywhere near 100% utilization in the real world as the maximum power point voltage will vary considerably with temperature ... which is impacted by solar irradiance as well.
@Semiman_#1: True. If you wanted to achieve temperature-invariant MPPT with this chip, it looks like you'd have to detach Vs and CSN from INTVCC, and re-attach the pins to an external temperature-sensing diode. You'd need to tweak the resistor values accordingly. I haven't shopped around, but it would seem reasonable for solar panel makers to include a temperature-sensing diode in the center of the panel; the panel's MPPT should track the diode's open-circuit voltage fairly well. If that's not the case, then you can always glue a diode to the panel and drive it with a current source (resistor to INTVCC).