AP2126

Document number: DS39758 Rev. 2 - 2

1 of 9

www.diodes.com

May 2017

© Diodes Incorporated

AP2126

300mA HIGH SPEED, EXTREMELY LOW NOISE CMOS LDO REGULATOR

Description

The AP2126 series are positive voltage regulator ICs fabricated by

CMOS process.

The AP2126 series have features of 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 AP2126 is available in 1.25V to 5.5V adjustable voltage versions.

The AP2126 series are available in SOT-23-5 Package.

Features



Wide Operating Voltage: 3.0V to 6V



High Output Voltage Accuracy: ±2%



High Ripple Rejection: 68dB@ f = 1kHz, 54dB@ f = 10kHz



Low Standby Current: 0.1µA



Low Dropout Voltage: 170mV@300mA for VOUT = 3.3V,

140mV@ 300mA for VOUT = 5.2V



Low Quiescent Current: 60µA Typical



Low Output Noise: 80µVrms@VOUT = 1.25V



Short Current Limit: 50mA



Over Temperature Protection



Compatible with Low ESR Ceramic Capacitor: 1µF for CIN and

COUT



Excellent Line/Load Regulation



Soft Start Time: 50µs



Auto Discharge Resistance: RDS(ON) = 60Ω



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



Halogen & Antimony F

ree. “Green” Device (Note 3)

Pin Assignments

(Top View)

1

2

3

4

5

VIN

GND

Shutdown

VOUT

ADJ

SOT-23-5

Applications



Datacom



Notebook Computers



Mother Board

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.

Typical Applications Circuit

VIN

VIN

VOUT

VOUT

ADJ

Shutdown

GND

COUT

1µF

CIN

1µF

R1

R2

AP2126

1

3

2

4

5

VOUT = 1.25*(1+R1/R2) V