Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
General Description
The AZ431 series ICs are three-terminal adjustable
shunt 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 and other adjustable regulators.
The AZ431 series ICs contain two voltage types, 40V
and 20V. The output voltage of both types can be set to
any value between V
REF
(2.5V) and the corresponding
maximum cathode voltage.
The AZ431 precision reference is offered in two band-
gap tolerance: 0.4% and 0.8%.
These ICs are available in 5 Packages: TO-92, SOT-23-
3, SOT-23-5, SOT-89 and SOIC-8.
AZ431
Features
·
·
·
·
·
·
·
·
·
Programmable Precise Output Voltage from 2.5V
to 36V or 18V
Very Accurate Reference Voltage: 0.15% Typical
High Stability under Capacitive Load
Low Temperature Deviation: 4.5mV Typical
Low Equivalent Full-range Temperature Coeffi-
cient with 20PPM/
o
C Typical
Low Dynamic Output Resistance: 0.2Ω Typical
Sink Current Capacity from 1mA to 100 mA
Low Output Noise
Wide Operating Range of -40 to 125
o
C
Applications
·
·
·
·
·
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
SOIC-8
SOT-89
TO-92
SOT-23-3
SOT-23-5
Figure 1. Package Types of AZ431
Dec. 2003 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
1
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Pin Configuration
M Package
(SOIC-8)
N Package
(SOT-23-3)
ANODE
AZ431
R Package
(SOT-89)
CATHODE
ANODE
ANODE
NC
1
2
3
4
8
7
6
5
REF
ANODE
ANODE
NC
REF
1
3
2
1
2
3
CATHODE
REF
ANODE CATHODE
Z Package
(TO-92)
K Package
(SOT-23-5)
3
2
1
CATHODE
ANODE
REF
NC
NC
CATHODE
1
2
3
5
ANODE
4
REF
Figure 2. Pin Configuration of AZ431 (Top View)
Functional Block Diagram
CATHODE
REF
+
-
V
REF
ANODE
Figure 3. Functional Block Diagram of AZ431
Dec. 2003 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
2
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Ordering Information for 40V Products
Package
SOT-23-3
SOT-23-5
TO-92
SOIC-8
SOT-89
-40 to 125
o
C
Temperature
Range
Voltage
Tolerance
0.4%
0.8%
0.4%
0.8%
0.4%
0.8%
0.4%
0.8%
0.4%
0.8%
Part Number
AZ431AN-A
AZ431BN-A
AZ431AK-A
AZ431BK-A
AZ431AZ-A
AZ431BZ-A
AZ431AM-A
AZ431BM-A
AZ431AR-A
AZ431BR-A
Marking ID
N41
N42
K3A
K3B
AZ431AZ-A
AZ431BZ-A
AZ431AM-A
AZ431BM-A
431A
431B
Packing Type
Reel
Reel
Reel
Reel
Bulk/Ammo
Bulk/Ammo
Tube/Tape/Reel
Tube/Tape/Reel
Reel
Reel
AZ431
Ordering Information for 20V Products
Package
SOT-23-3
SOT-23-5
TO-92
SOIC-8
SOT-89
-40 to 125
o
C
Temperature
Range
Voltage
Tolerance
0.4%
0.8%
0.4%
0.8%
0.4%
0.8%
0.4%
0.8%
0.4%
0.8%
Part Number
AZ431AN-B
AZ431BN-B
AZ431AK-B
AZ431BK-B
AZ431AZ-B
AZ431BZ-B
AZ431AM-B
AZ431BM-B
AZ431AR-B
AZ431BR-B
Marking ID
N44
N45
K4A
K4B
AZ431AZ-B
AZ431BZ-B
AZ431AM-B
AZ431BM-B
431C
431D
Packing Type
Reel
Reel
Reel
Reel
Bulk/Ammo
Bulk/Ammo
Tube/Tape/Reel
Tube/Tape/Reel
Reel
Reel
Some of our products are available in Lead Free packages; If buyers need Lead Free product, please add -E1 after
the part number in your order. For example, AZ431AM-A is a standard tin-lead product, AZ431AM-A-E1 means
a Lead Free product.
A Z 431
X Y - Z
Circuit Type
Bandgap Tolerance
A: 0.4%
B: 0.8%
A: AZ431(40V)
B: AZ431(20V)
Package
M: SOIC-8
N: SOT-23
R: SOT-89
Z: TO-92
K: SOT-23-5
Dec. 2003 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
3
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Absolute Maximum Ratings (Note 1)
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Power Dissipation
Junction Temperature
Storage Temperature Range
Symbol
V
KA
I
KA
I
REF
P
D
T
J
T
STG
Q
JA
Value
AZ431 (40V): 40
AZ431 (20V): 20
-100 to +150
10
M,Z,R Package: 770
N,K Package: 370
160
-65 to +150
M Package: 150
Package Thermal Impedance
N Package: 330
Z Package: 150
R Package: 50
K Package: 250
Note 1: 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 Max-
imum Ratings" for extended periods may affect device reliability.
o
AZ431
Unit
V
mA
mA
mW
o
C
o
C
C/W
Recommended Operating Conditions
Parameter
Cathode Voltage
Cathode Current
Operating Ambient
Temperature Range
Symbol
V
KA
I
KA
Min
V
REF
1.0
-40
Max
AZ431(40V): 36
AZ431(20V): 18
100
125
Unit
V
mA
o
C
Dec. 2003 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
4
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Electrical Characteristics for AZ431(40V)
Operating Conditions: T
A
=25
o
C unless otherwise specified.
Parameter
Reference Voltage
Deviation of Reference
Voltage Over-Temperature
Ratio of Change in Reference
Voltage to the Change in
Cathode Voltage
Reference Current
Deviation of Reference Current
Over Full Temperature Range
Minimum Cathode Current for
Regulation
Off-State Cathode Current
Dynamic Impedance
0.4%
0.8%
Test
Circuit
4
4
Symbol
V
REF
∆
V
REF
Conditions
V
KA
=V
REF,
I
KA
=10mA
V
KA
=V
REF
I
KA
= 10mA
0 to 70
o
C
-40 to
85
o
C
∆
V
KA
=
10V to V
REF
∆V
KA
=
36V to 10V
AZ431 (40V)
Min
Typ
Max
2.510
2.520
8
10
-2.7
mV/V
-0.5
0.7
0.4
0.4
0.05
-2.0
4
1.2
1.0
1.0
µ
A
µ
A
mA
µ
A
Ω
2.490 2.500
2.480 2.500
4.5
4.5
-1.0
Unit
V
mV
AZ431
5
∆
V
REF
∆
V
KA
I
REF
∆I
REF
I
KA
(MIN)
I
KA
(OFF)
Z
KA
I
KA
=10mA
5
5
4
6
4
I
KA
=10mA,R1=10KΩ, R2=∞
I
KA
=10mA, R1=10KΩ
R2=∞, T
A
=-40 to 85
o
C
V
KA
=V
REF
V
KA
=36 V, V
REF
=0
V
KA
=V
REF
, I
KA
=1 to 100mA,
f
≤
1.0KHz
0.15
0.5
Dec. 2003 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
5
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