AP2125

Document number: DS38144 Rev. 2 - 2

1 of 25

www.diodes.com

May 2016

© Diodes Incorporated

AP2125

300mA, HIGH SPEED, EXTREMELY LOW NOISE CMOS LDO REGULATOR

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.

These ICs are available in tiny SC-70-5 packages as well as industry

standard SOT-23-3 and SOT-23-5 packages.

Features



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



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

SOT-23-3

(Top View)

SOT-23-5/SC-70-5

Applications



CDMA/GSM Cellular Handsets



Battery-powered Equipments



Laptops, Palmtops, Notebook Computers



Hand-held Instruments



PCMCIA Cards



Portable Information Appliances

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html

for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

3

2

1

VIN

GND

VOUT

VIN

GND

VOUT

1

2

3

4

5

NC

CE