AP2129

Document number: DS41213 Rev. 2 - 2

1 of 13

www.diodes.com

July 2018

© Diodes Incorporated

AP2129

300mA HIGH SPEED, EXTREMELY LOW NOISE CMOS LDO REGULATOR

Description

The AP2129 is a 300mA, positive Voltage regulator ICs fabricated by

CMOS process. The AP2129 provides two kinds of output voltage

operation modes for setting the output voltage. Fixed output voltage

mode senses the output voltage on VOUT, adjustable output voltage

mode needs two resistors as a voltage divider.

The AP2129 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 AP2129 has 1.0V, 1.2V, 1.8V, 2.6V, 2.8V, 3.0V and 3.3V fixed

voltage version and 0.8V to 4.5V adjustable voltage version.

The AP2129 series are available in DFN-1.5x2-6 (1.0V, 1.2V, 1.8V,

2.6V, 2.8V, 3.0V, 3.3V) and SOT-23-5 (1.0V, 1.2V, 3.3V, ADJ)

packages.

Features



Wide Operating Voltage: 1.8V to 6V



High Output Voltage Accuracy: ±2%



High Ripple Rejection: 65dB@ f = 1kHz, 45dB@ f = 10kHz



Low Standby Current: 0.1µA



Low Quiescent Current: 60µA Typical



Low Output Noise: 60µVrms



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) = 60

Pin Assignments

(Top View)

Pin 1 Mark

1

2

3

4

5

6

VIN

GND

Shutdown

VOUT

NC

NC

DFN-1.5x2-6

(Top View)

1

2

3

4

5

VIN

GND

Shutdown

VOUT

ADJ/NC

SOT-23-5

Applications



Datacom



Notebook Computers



Mother Board