Diodes AZ431A User Manual
AZ431-A
Document number: DS36721 Rev. 4 – 2
1 of 21
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January 2014
© Diodes Incorporated
AZ431-A
A Product Line of
Diodes Incorporated
Description
The AZ431-A is a three-terminal adjustable shunt regulator with
guaranteed thermal stability over a full operation range. It features
sharp turn-on characteristics, low temperature coefficient and low
output impedance, which make it ideal substitute for Zener diode in
applications such as switching power supply, charger and other
adjustable regulators.
The output voltage of AZ431-A can be set to any value between V
REF
(2.5V) and the corresponding maximum cathode voltage (36V).
The AZ431-A precision reference is offered in two voltage tolerance:
0.4% and 0.8%.
This IC is available in 4 packages: TO92 (bulk or ammo packing),
SOT23, SOT25 and SOT89.
Applications
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
Features
Programmable Precise Output Voltage from 2.5V to 36V
High Stability under Capacitive Load
Low Temperature Deviation: 4.5mV Typical
Low Equivalent Full-range Temperature Coefficient with
20PPM/oC Typical
Sink Current Capacity from 1mA to 100mA
Low Output Noise
Wide Operating Range of -40 to +125oC
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)
3
2
1
ANODE
REF CATHODE
1
2
3
REF
ANODE
CATHODE
1
2
3
REF
ANODE
CATHODE
ADJUSTABLE PRECISION SHUNT REGULATORS
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)
(SOT23/ N Package) (SOT89 Option 1/ R Package) (SOT89 Option 2/ R Package)
AZ431-A
Document number: DS36721 Rev. 4 – 2
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January 2014
© Diodes Incorporated
AZ431-A
A Product Line of
Diodes Incorporated
1
2
3 4
5
REF
ANODENC
*
CATHODE
(Note 4)
1
2
3
ANODE
REF
CATHODE
1
2
3
CATHODE
ANODE
REF
Pin Assignments (Cont.)
(SOT25/ K Package) (TO92 (Bulk Packing)/ Z Package) (TO92 (Ammo Packing)/ Z Package)
Note: 4. * Pin 2 is attached to substrate and must be connected to ANODE or open.
(Top View) (Top View) (Top View)
Typical Applications Circuit
Shunt Regulator
High Current Shunt Regulator
AZ431-A
Document number: DS36721 Rev. 4 – 2
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January 2014
© Diodes Incorporated
AZ431-A
A Product Line of
Diodes Incorporated
Typical Applications Circuit (Cont.)
Current Source or Current Limit
Precision 5V 1A Regulator
PWM Converter with Reference
AZ431-A
Document number: DS36721 Rev. 4 – 2
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© Diodes Incorporated
AZ431-A
A Product Line of
Diodes Incorporated
Symbol
Parameter
Rating
Unit
VKA
Cathode Voltage
40
V
IKA
Cathode Current Range (Continuous)
-100 to 150
mA
I
REF
Reference Input Current Range
10
mA
PD
Power Dissipation
Z, R Package: 770
mW
N, K Package: 370
TJ
Junction Temperature
+150
ºC
T
STG
Storage Temperature Range
-65 to +150
ºC
ESD
ESD (Human Body Model)
2000
V
Symbol
Parameter
Min
Max
Unit
VKA
Cathode Voltage
V
REF
36
V
IKA
Cathode Current
1.0
100
mA
TA
Operating Ambient Temperature Range
-40
+125
ºC
Functional Block Diagram
Absolute Maximum Ratings (Note 5)
Note: 5. 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
AZ431-A
Document number: DS36721 Rev. 4 – 2
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January 2014
© Diodes Incorporated
AZ431-A
A Product Line of
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Symbol
Test
Circuit
Parameter
Conditions
Min
Typ
Max
Unit
V
REF
4
Reference Voltage
0.4%
V
KA
= V
REF
, I
KA
= 10mA
2.490
2.500
2.510
V
0.8%
2.480
2.500
2.520
V
REF
4
Deviation of Reference Voltage
Over Full Temperature Range
V
KA
= V
REF
I
KA
= 10mA
0 to +70oC
–
4.5
8
mV
-40 to +85oC
–
4.5
10
-40 to +125oC
–
4.5
16
V
REF
VKA
5
Ratio of Change in Reference
Voltage to the Change in
Cathode Voltage
I
KA
= 10mA
V
KA
=
10V to V
REF
–
-1.0
-2.7
mV/V
V
KA
=
36V to 10V
–
-0.5
-2.0
I
REF
5
Reference Current
I
KA
= 10mA, R1 = 10KΩ, R2 =
∞
–
0.7 4 µA
I
REF
5
Deviation of Reference Current
Over Full Temperature Range
I
KA
= 10mA, R1 = 10KΩ
R2 = ∞, TA = -40 to +125oC
–
0.4
1.2
µA
IKA
(Min)
4
Minimum Cathode Current for
Regulation
V
KA
= V
REF
–
0.4
1.0
mA
IKA
(Off)
6
Off-state Cathode Current
V
KA
= 36V, V
REF
= 0
–
0.05
1.0
µA
ZKA
4
Dynamic Impedance
V
KA
= V
REF
, I
KA
= 1 to 100mA,
f ≤ 1.0KHz
–
0.15
0.5
Ω
θ
JC
–
Thermal Resistance
SOT23
–
135.48
–
o
C/W
–
SOT25
–
135.48 – –
TO92
–
81.63 – –
SOT89
–
29.80
–
Electrical Characteristics (@T
= +25°C, unless otherwise specified.)
A
AZ431-A
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AZ431-A
A Product Line of
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Electrical Characteristics (Cont.)
Test Circuit 4 for V
= V
KA
REF
Test Circuit 5 for V
KA
> V
REF
Test Circuit 6 for I
OFF
AZ431-A
Document number: DS36721 Rev. 4 – 2
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January 2014
© Diodes Incorporated
AZ431-A
A Product Line of
Diodes Incorporated
-60 -40 -20 0 20 40 60 80 100 120 140
2.485
2.490
2.495
2.500
2.505
2.510
Reference Voltage (V)
Ambient Temperature (oC)
VKA = V
REF
IKA = 10mA
-60 -40 -20 0 20 40 60 80 100 120 140
0.0
0.5
1.0
1.5
R1=10K,R2=Infinite
IKA=10mA
Reference Current (
A)
Ambient Temperature (0C)
-2 -1 0 1 2 3
-100
-50
0
50
100
150
Cathode Current (mA)
Cathode Voltage (V)
VKA=V
REF
TA=250C
-1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5
-200
0
200
400
600
800
Cathode Current (
A)
Cathode Voltage (V)
VKA=V
REF
TA=250C
-40 -20 0 20 40 60 80 100 120
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Off-State Cathode Current (
A)
Ambient Temperature (oC)
VKA=36V
V
REF
=0
-40 -20 0 20 40 60 80 100 120
-1.4
-1.3
-1.2
-1.1
-1.0
-0.9
VKA=3.5V to 36V
V
REF
/ V
KA
(mV/V)
Ambient Temperature (oC)
Performance Characteristics
Reference Voltage vs. Ambient Temperature Reference Current vs. Ambient Temperature
Cathode Current vs. Cathode Voltage Cathode Current vs. Cathode Voltage
Off-State Cathode Current vs. Ambient Temperature Ratio of Delta Reference Voltage to the
Ratio of Delta Cathode Voltage
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