Diodes Incorporated

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Back to Linear and Low Dropout (LDO) Regulators


High Speed, Extremely Low Noise LDO Regulator

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The AP2120 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. The AP2120 series feature high supply voltage 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 AP2120 series have 1.2V, 1.3V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.2V, 3.3V, 3.6V, 4.0V and 5.0V versions.


· Low Dropout Voltage at IOUT=100mA: 200mV Typical (Except 1.2V, 1.3V and 1.5V Versions) · Low Quiescent Current: 25μA Typical · High Ripple Rejection: 65dB Typical (F=1kHz) · Output Current: More Than 150mA (250mA Limit) · Extremely Low Noise: 15μVrms@VOUT=1.2V, 1.3V, 1.5V (10Hz to 100kHz) · Excellent Line Regulation: 4mV Typical · Excellent Load Regulation: 12mV Typical · High Output Voltage Accuracy: ±2% · Excellent Line Transient Response and Load Transient Response · Compatible with Low ESR Ceramic Capacitor (as Low as 1μF)


· Mobile Phones, Cordless Phones · Wireless Communication Equipment · Portable Games · Cameras, Video Recorders · Sub-board Power Supplies for Telecom Equipment · Battery Powered Equipment

Product Specifications

Product Parameters

Iq (max) (µA) 50
Iq (typ) (?A) 25
AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Type LDO
Output options Fixed
Iout (A) 0.15
Vin (Max) (V) 6
Vin (Min) (V) 2
Vout (min) 1.2
Vout (max) 3.65
Fixed Vout (V) 1.2, 1.3, 1.5, 1.8, 2.5, 2.8, 3.0, 3.2, 3.3, 3.6, 4.0, 5.0
Accuracy 25C 2
Noise uV RMS 10-100 kHz 15
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage 0.5
PSRR (dB) 1kHz 65
Operating Temperature (Ambient) (°C) -40 to 85
Enable Active No
Channels 1
Output Discharge No
Power Good No
Reverse Protection No
VCTL Function No

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Technical Documents

Recommended Soldering Techniques


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