2-1. Useful functions available with LDO regulators

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

Various functions
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

Chapter2 Convenient functions of LDO

2-2. Overcurrent protection operation of 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

Related information

A new window will open