Load switch ICs incorporate various functions that help ensure stable system operation.
|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