The AP2121 series are positive voltage regulator ICsfabricated by CMOS process. Each of these ICs con-sists of a voltage reference, an error amplifier, a resis-tor network for setting output voltage, a current limitcircuit for current protection and a chip-enable circuit(5-pin products only).The AP2121 series feature high supply voltage ripplerejection, low dropout voltage, low noise, high outputvoltage accuracy, and low current consumption whichmake them ideal for use in various battery-powereddevices. The AP2121 series have 1.2V, 1.3V, 1.5V, 1.8V, 2.5V,2.8V, 3.0V, 3.2V and 3.3V versions.The AP2121 are available in standard SOT-23-3 andSOT-23-5 packages.
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