AP2138/2139

Document number: DS37428 Rev. 5 - 2

1 of 29

www.diodes.com

August 2019

© Diodes Incorporated

AP2138/2139

ULTRA LOW QUIESCENT CURRENT CMOS LDO

Description

The AP2138/2139 series are CMOS-based positive voltage regulator

ICs. Each of these ICs consists of a voltage reference, an error

amplifier, a resistor network for setting output voltage and a current

limit circuit for current protection.

The difference between AP2138 and AP2139 is the AP2139 has an

enable circuit with a quick discharge function.

These ICs feature high output voltage accuracy, extremely low

quiescent current and low dropout voltage which make them ideal for

use in various power sources for portable applications.

The AP2138/2139 series have 1.2V, 1.4V, 1.5V, 1.8V, 2.1V, 2.2V,

2.5V, 2.8V, 3.0V, 3.3V, 3.6V and 4.0V fixed output voltage versions.

The AP2138 series is available in SOT-23-3 and SOT-89 packages,

AP2139 series is available in SOT-23-5 package.

Features



Ultra-Low Quiescent Current: 1.0µA Typical



Output Voltages: 1.2V, 1.4V, 1.5V, 1.8V, 2.1V, 2.2V, 2.5V, 2.8V,

3.0V, 3.3V, 3.6V and 4.0V



High Output Voltage Accuracy: ±2%



Output Current: 250mA



Low Dropout Voltage:



25mV Typical at IOUT = 10mA and VOUT = 3V



200mV Typical at IOUT = 100mA and VOUT = 3V



Line Regulation: 6mV Typical



Load Regulation: 25mV Typical



Low Output Voltage Temperature Coefficient: ±100ppm/°C



Low Standby Current: 0.1µA Typical (AP2139)



Active Quick Output Discharge (AP2139)



Logic-Controlled Enable (AP2139)



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



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

Applications



Battery Powered Equipment



Reference Voltage Sources



Cameras, Video Cameras



Portable AV Systems



Mobile Phones



Communication Tools



Portable Games

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.

2. See https://www.diodes.com/quality/lead-

free/ 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.

Pin Assignments

(Top View)

(Top View)

(Top View)

SOT-23-3

SOT-23-5

SOT-89 (Option 1)/ R Package

3

2

1

VIN

VOUT

GND

VIN

VOUT

GND

1

2

3

4

5

CE

NC

VIN

VOUT

GND

1

2

3