Diodes Incorporated

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AP2122 (Not Recommended for new design)

NRND = Not Recommended for New Design

High Speed, Extremely Low Noise LDO Regulator

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The AP2122 series are positive voltage regulator ICs fabricated by CMOS process. Each of these ICs consists of a voltage reference, an error amplifier, a resistor network for setting output voltage, a current limit circuit for current protection and a chip enable circuit . The AP2122 series feature high ripple rejection, low dropout voltage, low noise, high output voltage accuracy, and low current consumption which make them ideal for use in various battery-powered devices. The AP2122 series have 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.2V and 3.3V versions.


· Low Dropout Voltage at IOUT=100mA: 150mV Typical (Except 1.5V Version) · Low Standby Current: 0.1μA Typical · Low Quiescent Current: 25μA Typical · High Ripple Rejection: 70dB Typical(F=10kHz) · Maximum Output Current: More Than 150mA (300mA Limit) · Extremely Low Noise: 30μVrms (10Hz to 100kHz) · Excellent Line Regulation: 4mV Typical · Excellent Load Regulation: 12mV Typical · High Output Voltage Accuracy: ±2% · Excellent Line and Load Transient Response · Compatible with Low ESR Ceramic Capacitor (as Low as 1μF)


· Mobile Phones, Cordless Phones · MP3/4 · Portable Electronic Devices · Cameras, Video Recorders · Sub-board Power Supplies for Telecom Equipment · Battery Powered Equipment

Product Specifications

Product Parameters

Accuracy 25C 2%
Automotive Compliant and PPAP capable no
Channels 1
Compliance (Only Automotive supports PPAP) Standard
Enable Active H
Features Small-size
Fixed Vout (V) 1.5, 1.8, 2.5, 2.8, 3.0, 3.2, 3.5
Fixed Vout(V) 3.5, 3.2, 3.0, 2.8, 2.5, 1.8, 1.5
Fixed Vout(V) 3.5,3.2,3.0,2.8,2.5,1.8,1.5
IOUT 0.15
Iout (A) 0.15
IQ (mA) 25
Iq (max) (µA) 50
Iq (max) (µA) 50
Iq (max) (µA) 50
Iq (typ) (µA) 25
Iq (typ) (µA) 25
Noise uV RMS 10-100 kHz 30
Operating Temperature (Ambient) (°C) -40 to 85
Output Discharge no
Output options Fixed
PSRR (dB) 1K Hz 70
PSRR (dB) 1kHz 70
VCTL Function no
VDROPOUT (Max) 0.4
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage 0.4
VDROPOUT (Max) (V) at Max Current and Max Voltage 0.4
VDROPOUT (Max)(V) at Max Current and Max Voltage 0.4
VIN (Max) 6
Vin (Max) (V) 6
VIN (Min) 2
Vin (Min) (V) 2
VOUT 3.5, 3.2, 3, 2.8, 2.5, 2, 1.8, 1.5
Vout (max) 3.5
Vout (min) 1.5

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2343 2018-05-15 2018-08-15 Qualification of Additional Bill of Materials (BOM), Fab Source for Select Products with Top Marking Change on Select Product