Diodes Incorporated

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300MA High Speed, Extremely Low Noise CMOS LDO Regulator

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The AP2128 series are positive voltage regulator ICs fabricated by CMOS process. The AP2128 provides 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. The AP2128 series have features of low dropout voltage, low noise, high output voltage accuracy, and low current consumption which make them ideal for use in various battery-powered devices. AP2128 have 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 3.9V, 4.2V, 4.75V, 5.2V fixed voltage versions and 0.8V to 5.5V adjustable voltage version.


· Wide Operating Voltage: 2.5V to 6V · Low Dropout Voltage:170mV@300mA for VOUT=3.3V, 140mV@300mA for VOUT=5.2V · High Output Voltage Accuracy: ±2% · High Ripple Rejection: 68dB@ f=1kHz, 54dB@ f=10kHz · Low Standby Current: 0.1μA · Low Quiescent Current: 60μA Typical · Low Output Noise: 60μVrms@VOUT=0.8V · Short Current Limit: 50mA · Over Temperature Protection · Compatible with Low ESR Ceramic Capacitor: 1μF for CIN and COUT · Excellent Line/Load Regulation · Soft Start Time: 50μs · Auto Discharge Resistance: RDS(ON)=60Ω


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Product Specifications

Product Parameters

Iq (max) (µA) 90
Iq (typ) (µA) 60
AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Type LDO
Output options Adjustable & Fixed
Iout (A) 0.3
Vin (Max) (V) 6
Vin (Min) (V) 2.5
Vout (min) 0.8
Vout (max) 1.25
Fixed Vout (V) 1.0, 1.2, 1.5, 1.8, 2.5, 2.8, 3.0, 3.3, 3.9, 4.2, 4.75, 5.2
Adjustable VFB (V) 0.8
Accuracy 25C 2
Noise uV RMS 10-100 kHz 60
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage 0.3
PSRR (dB) 1kHz 68
Operating Temperature (Ambient) (°C) -40 to 85
Enable Active Yes (High)
Channels 1
Output Discharge Yes
Power Good No
Reverse Protection No
VCTL Function No

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