JAJSER7D November 2018 – January 2019 LMG1210
The LMG1210 has three separate overtemperature thresholds: two on the low-side and one on the high-side. The lowest overtemperature threshold is the low-side switching threshold at 150 degrees minimum. When exceeded, this disables switching on both the low and high sides. However, the 5 V LDO continues to operate.
If the low-side temperature continues to rise, due to a short or external load on the 5 V LDO, then at 10 degrees higher, the low-side shuts down the 5 V LDO.
The high-side has an independent overtemperature threshold at 160 minimum. When triggered, it only shuts off the high-side while the low-side may continue to operate.
If it is undesirable in an application to have only the high side shut off and not the low side, TI recommends designing the thermal cooling of the board in a way to make the low-side die hotter. This can be achieved by controlling the size of the thermal planes connected to each thermal pad.