2-2. Overcurrent protection operation of LDO regulators

Figure 2.2 Overcurrent protection operation of LDO regulators

When a short-circuit between a load on the VOUT side and GND or other system failure occurs, this function limits the output current of an LDO regulator to protect itself and the system in which it is used. Toshiba’s LDO regulators provide overcurrent protection called foldback. In the event of excessive current higher than the internal threshold, foldback reduces the output current (IOUT) as the output voltage (VOUT) decreases. Even when the output voltage has reached 0 V, the output current continues flowing at the internally set level. The term “foldback” is derived from the shape of the IOUT-vs-VOUT curve that folds back as shown below during protection operation. When a faulty condition causing an overcurrent condition disappears, an LDO regulator automatically recovers from overcurrent protection, returning the output voltage to the normal level.

The following links also provide a description of overcurrent protection:

Application note: Basics of Low-Dropout (LDO) Regulator ICs

FAQ: How does overcurrent protection work in an LDO regulator?

You can perform a parametric search of LDO regulators with an overcurrent protection function:

Parametric search of LDO regulators with an overcurrent protection function

Chapter2 Convenient functions of LDO

2-1. Useful functions available with LDO regulators
2-3. Thermal shutdown (TSD) operation of LDO regulators
2-4. Inrush current reduction function of LDO regulators
2-5. Auto discharge function of LDO regulators
2-6. Undervoltage lockout (UVLO) function of LDO regulators

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