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2-1. Useful functions available with LDO regulators
Load switch ICs incorporate various functions that help ensure stable system operation.
| Function | Description |
|---|---|
| Overcurrent protection | This function limits the output current to protect a system in the event of an excessive current flowing in an LDO regulator, for example, because of a short-circuit between a load on the VOUT side and GND. |
| Thermal shutdown | This function turns off the LDO regulator to protect the system when the heat generated by the LDO regulator exceeds its heat dissipation capacity. |
| Inrush current reduction (slew rate control, soft start) | This function helps ensure stable system operation by slowly increasing the output voltage during the turn-on of an LDO regulator. Inrush current reduction is also called slew rate control or soft start. |
| Auto discharge | This function facilitates system power sequencing by quickly discharging the smoothing capacitor connected to the VOUT pin when an LDO regulator is turned off. |
| Undervoltage lockout (UVLO) | This function turns off the output of an LDO regulator when its input voltage drops below a predefined threshold so that the system operation will not become unstable. |
The subsequent sections describe each of these functions.
The following application note also provides a description of these functions:
Application note: Basics of Low-Dropout (LDO) Regulator ICs
Application note: LDO Regulators Glossary
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Chapter2 Convenient functions of LDO
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