SBVS343A March 2019 – September 2019 TPS7A78
The LDO block has an internal current-limit circuit that protects the output during overcurrent events or short-circuit faults. The current-limit circuit limits the output current to (ICL), as specified in the Electrical Characteristics table.
When in current limit, the output voltage cannot be regulated and the device heats up because of the increase in power dissipation. When in current limit, the LDO pass transistor dissipates power equal to VDO × ICL, where VDO is equal in the worst case to VLDO_IN. The heat generated when operating at current limit, in conjunction with the ambient temperature, can trigger the internal thermal shutdown. During thermal shutdown, both VLDO_OUT and the switched-capacitor stage are shut down to prevent further heating; see the Load Transient section for more details.