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300MA, High Speed, Extremely Low Noise CMOS LDO Regulator

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The AP2125 series are 300mA, positive voltage regulator ICs fabricated by CMOS process. Each of these ICs is equipped with a voltage reference, an error amplifier, a resistor network for setting output voltage, a chip enable circuit, a current limit circuit and OTSD (over temperature shut down) circuit to prevent the IC from over current and over temperature. The AP2125 series have features of 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 apparatus. The AP2125 have 1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 4.15V and 4.2V fixed voltage versions.


· Excellent Ripple Rejection: 70dB Typical (1.8V Version) · Low Dropout Voltage: 65mV (IOUT = 100mA, 3.3V Version) · Low Standby Current: 0.01μA Typical · Low Quiescent Current: 60μA Typical · Extremely Low Noise: 50μVrms Typical · Maximum Output Current: 300mA (Min.) · High Output Voltage Accuracy: ±2% · Compatible with Low ESR Ceramic Capacitor · Excellent Line/Load Regulation


· CDMA/GSM Cellular Handsets · Battery-powered Equipments · Laptops, Palmtops, Notebook Computers · Hand-held Instruments · PCMCIA Cards · Portable Information Appliances

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Standard
Output options Fixed
Iout (A) 0.3
Vin (Max) (V) 6
Vin (Min) (V) 2.3
Vout (min) 1.8
Vout (max) 4.2
Fixed Vout (V) 1.8, 2.5, 2.8, 3.0, 3.3, 4.15, 4.2
Iq (typ) (µA) 60
Accuracy 25C 2%
Noise uV RMS 10-100 kHz 50
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage 0.3
PSRR (dB) 1kHz 70
Operating Temperature (Ambient) (°C) -40 to 85 (°C)
Enable Active H
Channels 1
Output Discharge yes
Iq (max)(µA) 90
VCTL function no

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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-2568 2022-03-29 2022-03-29 Qualified Additional Assembly & Test (A/T) Sites, Bill of Material, and updated Data Sheets for Package Outline Dimension Change
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site