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AP2138/2139
Document number: DS37428 Rev. 3 - 2
1 of 29
www.diodes.com
March 2016
© Diodes Incorporated
ADVANCED I NF ORMATION
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 I
OUT
= 10mA and V
OUT
= 3V
200mV Typical at I
OUT
= 100mA and V
OUT
= 3V
Line Regulation: 6mV Typical
Load Regulation: 25mV Typical
Low Output Voltage Temperature Coefficient: ±100ppm/
o
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) 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.
Pin Assignments
(Top View) (Top View) (Top View)
SOT-23-3 SOT-23-5 SOT-89 (Option 1)/ R Package
3
2
1
V
IN
V
OUT
GND
V
IN
V
OUT
GND
1
2
3 4
5
CE
NC
V
IN
V
OUT
GND
1
2
3
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