AZ431L
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR
Description
The AZ431L series ICs are low voltage three-terminal adjustable
regulators with guaranteed thermal stability over a full operation
range. These ICs feature sharp turn-on characteristics, low
temperature coefficient and low output impedance, which make them
ideal substitutes for Zener diodes in applications such as switching
power supply, charger, motherboard and other adjustable regulators.
The output voltage can be set to any value between 1.24V and 18V
with two external resistors.
The AZ431L precision reference is offered in two voltage tolerance:
0.5% and 1.0%.
These ICs are available in 4 packages: TO92 (bulk or ammo
packing), SOT23, SOT25 and SOT89.
Pin Assignments
(Top View)
(Top View)
3 CATHODE
2 ANODE
1 REF
3
CATHODE
ANODE
REF
2
1
TO92 (Bulk Packing)
(Top View)
ANODE
3
NC
*
TO92 (Ammo Packing)
(Top View)
Features
Wide Programmable Precise Output Voltage from 1.24V to 18V
High Stability under Capacitive Load
Low Temperature Deviation: 3mV Typical
Low Equivalent Full-range Temperature Coefficient: 20PPM/°
C
Typical
Low Dynamic Output Resistance: 0.05Ω Typical
High Sink Current Capacity from 0.1mA to 100mA
Low Output Noise
Wide Operating Range of -40 to +125°
C
Lead-Free Packages: TO92, SOT23, SOT25, SOT89
Totally Lead-Free; RoHS Compliant (Notes 1 & 2)
Lead-Free Packages, Available in “Green” Molding Compound:
TO92, SOT23, SOT25, SOT89
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
(Top View)
1
REF
2
CATHODE
1
2
3
5
ANODE
(Note 4)
CATHODE
4
REF
SOT23
open.
SOT25
Note 4: *Pin 2 is attached to substrate and must be connected to ANODE or
(Top View)
1
2
3
1
2
3
Applications
Graphic Card
PC Motherboard
Voltage Adapter
Switching Power Supply
Charger
REF ANODE CATHODE
SOT89 (Option 1)
REF ANODE CATHODE
SOT89 (Option 2)
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.
AZ431L
Document number: DS36801 Rev. 4 - 2
1 of 20
www.diodes.com
March 2018
© Diodes Incorporated
AZ431L
Functional Block Diagram
Absolute Maximum Ratings
(Note 5)
Symbol
V
KA
I
KA
I
REF
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Z, R Package
P
D
Power Dissipation
N, K Package
T
J
T
STG
Note 5:
Rating
20
-100 to 100
10
770
Unit
V
mA
mA
mW
370
+150
-65 to +150
°
C
°
C
Junction Temperature
Storage Temperature Range
Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
V
KA
I
KA
—
Parameter
Cathode Voltage
Cathode Current
Operating Ambient Temperature Range
Min
V
REF
0.1
-40
Max
18
100
+125
Unit
V
mA
°
C
AZ431L
Document number: DS36801 Rev. 4 - 2
4 of 20
www.diodes.com
March 2018
© Diodes Incorporated
AZ431L
Electrical Characteristics
(Operating Conditions: T
A
= +25 ° unless otherwise noted.)
C,
Symbol
Parameter
0.5%
V
REF
Reference Voltage
1.0%
0 to +70°
C
∆V
REF
Deviation of Reference Voltage
Over Full Temperature Range
4
V
KA
= V
REF
,
I
KA
= 10mA
-40 to +85°
C
-40 to +125°
C
∆V
REF
∆V
KA
I
REF
∆I
REF
I
KA
(Min)
I
KA
(Off)
Z
KA
Ratio of Change in V
REF
to the
Change in Cathode Voltage
Reference Input Current
Deviation of Reference Current
Over Full Temperature Range
Minimum Cathode Current for
Regulation
Off-state Cathode Current
5
5
5
4
I
KA
= 10mA,
∆V
KA
: V
REF
to 16V
I
KA
= 10mA, R1 = 10kΩ, R2 = ∞
I
KA
= 10mA, R1 = 10kΩ, R2 = ∞,
T
A
= -40 to +125°
C
V
KA
= V
REF
V
REF
= 0, V
KA
= 18V
6
V
KA
= 6, V
REF
= 0
Dynamic Impedance
4
V
KA
= V
REF
, I
KA
= 1 to 100mA,
f ≤ 1.0kHz
SOT23
SOT25
θ
JC
Thermal Resistance
—
TO92
SOT89
—
—
140.80
29.80
—
—
—
—
—
—
0.01
0.05
84.84
84.84
0.05
0.15
—
—
°
C/W
Ω
4
V
KA
= V
REF
, I
KA
= 10mA
1.228
—
—
—
—
—
—
—
—
1.240
2
3
4
-0.5
0.15
0.1
55
0.04
1.252
10
10
15
-1.5
0.4
0.4
80
0.10
µA
mV/V
µA
µA
µA
mV
Test
Circuit
Conditions
Min
1.234
Typ
1.240
Max
1.246
V
Unit
AZ431L
Document number: DS36801 Rev. 4 - 2
5 of 20
www.diodes.com
March 2018
© Diodes Incorporated
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