Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details. SC59

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details. SOT23

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details. SOT25

SOT353

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AP2125

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

Datasheet

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Description

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.

Feature(s)

· Excellent Ripple Rejection: 70dB Typical (1.8V Version) · Low Dropout Voltage: 65mV (I_OUT = 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

Application(s)

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

Specifications & Technical Documents

Product Parameters

Iq (typ) (µA)	60
Iq (max) (µA)	90
Operating Ambient Temperature (°C)	-40 to 85
AEC Qualified	No
Compliance (Only Automotive Supports PPAP)	Standard
Type	LDO
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
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
Enable Active	Yes (High)
Channels	1
Output Discharge	Yes
Power Good	No
Reverse Protection	No
VCTL Function	No

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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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-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products
PCN-2709	2025-01-07	2025-04-07	Additional Wafer Source (GFAB), Die Revision, Data Sheet Change and Additional Bill of Materials (BOM)
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