The AP2401 series are dual positive voltage regulator ICs fabricated by CMOS process. Each of these ICs consists of a voltage reference, two error amplifiers, two resistor networks for setting output voltages. Each channel has a current limit circuit for current protec- tion. The AP2401 series feature high ripple rejection, low dropout voltage, low noise, high output voltage accu- racy, and low current consumption which make them ideal for use in various battery-powered devices. The chip enable function allows the output of each channel to be turned on/off independently, greatly reducing the power consumption. The AP2401 series have 1.8V/2.5V, 1.8V/2.8V, 1.8V/ 3.3V and 2.8V/1.8V versions. The AP2401 are available in standard SOT-23-6 pack- age.