AP2128

Data Sheet 300mA HIGH SPEED, EXTREMELY LOW NOISE CMOS LDO REGULATOR General Description Features AP2128 The AP2128 series are positive voltage regulator ICs · Wide Operating Voltage: 2.5V to 6V fabricated by CMOS process. The AP2128 provides · Low Dropout Voltage:170mV@300mA for two kinds of output voltage operation modes for setting the output voltage. Fixed output voltage mode senses the output voltage on VOUT, adjustable output voltage mode needs two resistors as a voltage divider. · · VOUT=3.3V, 140mV@300mA for VOUT=5.2V High Output Voltage Accuracy: ±2% High Ripple Rejection: 68dB@ f=1kHz, 54dB@ f=10kHz The AP2128 series have features of low dropout · Low Standby Current: 0.1µA voltage, low noise, high output voltage accuracy, and · Low Quiescent Current: 60µA Typical low current consumption which make them ideal for · Low Output Noise: 60µVrms@VOUT=0.8V use in various battery-powered devices. · Short Current Limit: 50mA · Over Temperature Protection AP2128 have 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, · Compatible with Low ESR Ceramic Capacitor: 3.3V, 3.9V, 4.2V, 4.75V, 5.2V fixed voltage versions and 0.8V to 5.5V adjustable voltage version. 1µF for CIN and COUT · Excellent Line/Load Regulation AP2128 series are available in SOT-23-5 package. · Soft Start Time: 50µs · Auto Discharge Resistance: RDS(ON)=60Ω Applications · Datacom · Notebook Computers · Mother Board Sept. 2010 Rev. 2.0 SOT-23-5 Figure 1. Package Type of AP2128 BCD Semiconductor Ma...