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TPS7A54-Q1

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SBVS312 – SEPTEMBER 2017

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7.3.3 Internal Protection Features

In many applications, fault events can occur that damage devices in the system. Short circuits and excessive

heat are the most common fault events for power supplies. The TPS7A54-Q1 implements circuitry to protect the

device and its load during these events. Continuously operating in these fault conditions or above a junction

temperature of 140°C is not recommended because the long-term reliability of the device is reduced.

The internal current limit circuit is used to protect the LDO against high load-current faults or shorting events.

During a current-limit event, the LDO sources constant current; therefore, the output voltage falls with decreased

load impedance. Thermal shutdown can activate during a current limit event because of the high power

dissipation typically found in these conditions. For proper operation of the current limit, minimize the inductances

to the input and load. Continuous operation in current limit is not recommended.

The thermal shutdown circuit protects the LDO against excessive heat in the system, either resulting from current

limit or high ambient temperature.

temperature.

cycle on and off when thermal shutdown is reached under these conditions.