SLUSCE3C October 2015 – August 2020 TPS2549-Q1
PRODUCTION DATA
Two independent thermal-sensing circuits protect the TPS2549-Q1 device if the temperature exceeds recommended operating conditions. These circuits monitor the operating temperature of the power-distribution switch and disable operation. The device operates in constant-current mode during an overcurrent condition, which increases the voltage drop across power switch. The power dissipation in the package is proportional to the voltage drop across the power switch, so the junction temperature rises during an overcurrent condition. When the device is in a current-limiting condition, the first thermal sensor turns off the power switch when the die temperature exceeds OTSD1. If the device is not in a current-limiting condition, the second thermal sensor turns off the power switch when the die temperature exceeds OTSD2. Hysteresis is built into both thermal sensors, and the switch turns on after the device has cooled by approximately 20°C. The switch continues to cycle off and then on until the fault is removed. The open-drain false-reporting output, FAULT, is asserted (low) during an overtemperature shutdown condition.