ZHCSHI4D January 2018 – December 2019 TPS25221
PRODUCTION DATA.
The TPS25221 has 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 the Over Temperature Shutdown Threshold (OTSD). The TPS25221 device operates in constant-current mode during overload conditions, which increases the voltage drop across power-switch. Power dissipation in the package is proportional to the voltage drop across the power switch, which increases the junction temperature during an over-current condition. The first thermal sensor turns off the power switch when the die temperature exceeds 145°C (typical) 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 20°C (typical). The TPS25221 continues to cycle off and on until the fault condition is removed.
The ambient thermal sensor turns off the power-switch when the junction temperature exceeds 165°C (typical) in non-current limit condition. The part will turn the switch back on once the junction temperature has cooled approximately 20°C (typical).
The open-drain fault reporting output FAULT is asserted (active low) immediately during an over-temperature shutdown condition.