This application report describes the current limit protection behavior when operating during dropout operation for low dropout voltage (LDO) regulators. The TLV758P is used as an example device in this application report but this applies broadly to most TI LDO regulators.
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The TLV758P LDO device has an internal current limit circuit that protects the regulator during high-load current faults or a short circuit event. The current limit is a hybrid brickwall-foldback scheme. When the current limit circuit detects a high-load current fault and the output voltage is above the VFOLDBACK, the brickwall scheme limits the output current to the current limit ICL. If the output voltage is pulled below VFOLDBACK then the output current starts to fold back until it reaches the short circuit current limit, ISC.
where: