View s1323-series datasheet:

Rev.4.2_00 HIGH RIPPLE-REJECTION AND SMALL PACKAGE S-1323 Series CMOS VOLTAGE REGULATOR The S-1323 Series is a positive voltage regulator with a low dropout voltage, high output voltage accuracy, and low current consumption developed based on CMOS technology. A built-in low on-resistance transistor provides a low dropout voltage and large output current, and a built- in overcurrent protector prevents the load current from exceeding the current capacitance of the output transistor. An ON/OFF circuit ensures a long battery life. Compared with the voltage regulators using the conventional CMOS process, a larger variety of capacitors are available, including small ceramic capacitors. Small SNT-4A and SC-82AB packages realize high-density mounting. Feature