A Product Line of
Diodes Incorporated
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: TO-92 (bulk or ammo
packing), SOT-23, SOT-23-5 and SOT-89.
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/
o
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
o
C
Applications
Graphic Card
PC Motherboard
Voltage Adapter
Switching Power Supply
Charger
Pin Assignments
(Top View)
(Top View)
(Top View)
ANODE
3 CATHODE
2 ANODE
1 REF
3
CATHODE
ANODE
REF
3
2
1
1
REF
2
CATHODE
(TO-92 (Bulk Packing)/ Z Package)
(TO-92 (Ammo Packing)/ Z Package)
(SOT-23/ N Package)
AZ431L
Document number: DS36801 Rev. 3 - 2
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January 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AZ431L
Pin Assignments
(Cont.)
(Top View)
(Top View)
(Top View)
NC
*
1
2
3
5
ANODE
(Note 1)
CATHODE
4
REF
1
2
3
1
2
3
REF ANODE CATHODE
(SOT-23-5/ K Package)
(SOT-89 Option 1/ R Package)
REF ANODE CATHODE
(SOT-89 Option 2/ R Package)
Note 1: *Pin 2 is attached to substrate and must be connected to ANODE or open.
Typical Applications Circuit
Shunt Regulator
High Current Shunt Regulator
AZ431L
Document number: DS36801 Rev. 3 - 2
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A Product Line of
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AZ431L
Typical Applications Circuit
(Cont.)
Current Source or Current Limit
Precision 5V 1A Regulator
PWM Converter with Reference
AZ431L
Document number: DS36801 Rev. 3 - 2
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A Product Line of
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AZ431L
Functional Block Diagram
Absolute Maximum Ratings
(Note 2)
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
Junction Temperature
Storage Temperature Range
+150
-65 to +150
370
º
C
º
C
Rating
20
-100 to 100
10
770
mW
Unit
V
mA
mA
Note 2:
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
º
C
AZ431L
Document number: DS36801 Rev. 3 - 2
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January 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AZ431L
Electrical Characteristics
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
SOT-23
SOT-23-5
θ
JC
Thermal Resistance
–
TO-92
SOT-89
–
–
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
(Operating Conditions: T
A
= +25 º unless otherwise noted.)
C,
Test
Circuit
Conditions
Min
1.234
Typ
1.240
Max
1.246
Unit
V
AZ431L
Document number: DS36801 Rev. 3 - 2
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January 2014
© Diodes Incorporated
