ZHCSQT5 July 2022 TPS7A57
PRODUCTION DATA
A thermal shutdown protection circuit disables the LDO when the pass transistor junction temperature (TJ ) rises to TSD(shutdown) (typical). Thermal shutdown hysteresis assures that the device resets (turns on) when the temperature falls to TSD(shutdown) (typical). The thermal time constant of the semiconductor die is fairly short, thus the device may cycle off and on when thermal shutdown is reached until power dissipation is reduced. Power dissipation during start up can be high from large VIN – VOUT voltage drops across the device or from high inrush currents charging large output capacitors. Under some conditions, the thermal shutdown protection disables the device before start up completes. For reliable operation, limit the junction temperature to the maximum listed in the Section 6.5 table. Operation above this maximum temperature causes the device to exceed its operational specifications. Although the internal protection circuitry of the device is designed to protect against thermal overload conditions, this circuitry is not intended to replace proper heat sinking. Continuously running the device into thermal shutdown or above the maximum recommended junction temperature reduces long-term reliability.