JAJSHL7F October 2011 – June 2019 LMR24220
PRODUCTION DATA.
The junction temperature of the LMR24220 should not exceed the maximum limit. Thermal protection is implemented by an internal thermal shutdown circuit, which activates (typically) at 165°C to make the controller enter a low power reset state by disabling the main MOSFET, disabling the on-timer, and grounding the SS pin. Thermal protection helps prevent catastrophic failures from accidental device overheating. When the junction temperature falls back below 145°C (typical hysteresis = 20°C), the SS pin is released, and normal operation resumes.