SLVS841G November 2008 – October 2026 TPS2552 , TPS2552-1 , TPS2553 , TPS2553-1
PRODUCTION DATA
The TPS255x and TPS255x-1 have self-protection features using two independent thermal-sensing circuits that monitor the operating temperature of the power switch and disable operation if the temperature exceeds recommended operating conditions. The TPS255x device operates in constant-current mode during an overcurrent conditions, which increases the voltage drop across power-switch. The power dissipation in the package is proportional to the voltage drop across the power switch, which increases the junction temperature during an overcurrent condition. The first thermal sensor turns off the power switch when the die temperature exceeds 135°C (minimum) and the part is in current limit. Hysteresis is built into the thermal sensor, and the switch turns on after the device has cooled approximately 10°C.
The TPS255x and TPS255x-1 also have a second ambient thermal sensor. The ambient thermal sensor turns off the power-switch when the die temperature exceeds 155°C (minimum) regardless of whether the power switch is in current limit and turns on the power switch after the device has cooled approximately 10°C. The TPS255xand TPS255x-1 families continue to cycle off and on until the fault is removed.
The open-drain fault reporting output FAULT is asserted (active low) immediately during an overtemperature shutdown condition.