The device monitors its internal junction temperature (T_J) to avoid overheating and to limit the IC surface temperature. When the internal junction temperature exceeds the thermal regulation limit, the device automatically reduces the charge current to maintain the junction temperature at the thermal regulation limit (T_REG). During thermal regulation, the actual charging current is usually below the programmed value on the ISET pin.

Additionally, device thermal shutdown turns off the linear regulator when the IC junction temperature exceeds the T_SHUT threshold. The charger resumes operation when the IC die temperature decreases below the T_SHUT falling threshold.