Diodes AZ431B User Manual
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B
General Description
The AZ431-B 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-B can be set to any value
between V
cathode voltage.
The AZ431-B precision reference is offered in two
voltage tolerance: 0.4% and 0.8%.
This IC is available in 4 packages: TO-92 (bulk or
ammo packing), SOT-23, SOT-23-5 and SOT-89.
(2.5V) and the corresponding maximum
REF
Features
· Programmable Precise Output Voltage from 2.5V
to 18V
· High Stability under Capacitive Load
· Low Temperature Deviation: 4.5mV Typical
· Low Equivalent Full-range Temperature Coeffi-
o
cient with 20PPM/
· Sink Current Capacity from 1mA to 100mA
· Low Output Noise
· Wide Operating Range of -40 to 125
C Typical
o
C
Applications
· Charger
· Voltage Adapter
· Switching Power Supply
· Graphic Card
· Precision Voltage Reference
TO-92(Bulk Packing) SOT-89
SOT-23
Figure 1. Package Types of AZ431-B
Dec. 2012 Rev. 3.3 BCD Semiconductor Manufacturing Limited
1
TO-92(Ammo Packing)
SOT-23-5
Data Sheet
REF
V
REF
CATHODE
ANODE
+
-
3
21
1
23
1
2
34
5
1
2
3
1
2
3
ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B
Pin Configuration
N Package
(SOT-23)
ANODE
REF
CATHODE
Z Package
(TO-92(Bulk Packing))
CATHODE
ANODE
REF
R Package
(SOT-89)
REF ANODE
CATHODE
K Package
(SOT-23-5)
NC ANODE
*
(Note 1)
CATHODE
Note 1: Pin 2 is attached to substrate and
*
must be connected to ANODE or open
Z Package
(TO-92(Ammo Packing))
CATHODE
ANODE
REF
REF
Figure 2. Pin Configuration of AZ431-B (Top View)
Functional Block Diagram
Figure 3. Functional Block Diagram of AZ431-B
Dec. 2012 Rev. 3.3 BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B
Ordering Information
AZ431 -
Package
SOT-23
SOT-23-5
TO-92
SOT-89
Circuit Type
Voltage Tolerance
A: 0.4%
B: 0.8%
Package
N: SOT-23 K: SOT-23-5
R: SOT-89 Z: TO-92
Tempera-
ture Range
-40 to
125oC
125oC
-40 to
125oC
-40 to
125oC
-40 to
Vo lt a ge
To le ra nc e
0.4% AZ431AN-BTRE1 AZ431AN-BTRG1 EA4 GA4 Tape & Reel
0.8% AZ431BN-BTRE1 AZ431BN-BTRG1 EA5 GA5 Tape & Reel
0.4% AZ431AK-BTRE1 AZ431AK-BTRG1 E4A G4A Tape & Reel
0.8% AZ431BK-BTRE1 AZ431BK-BTRG1 E4B G4B Tape & Reel
0.4% AZ431AZ-BE1 AZ431AZ-BG1 AZ431AZ-BE1 AZ431AZ-BG1 Bulk
0.4% AZ431AZ-BTRE1 AZ431AZ-BTRG1 AZ431AZ-BE1 AZ431AZ-BG1 Ammo
0.8% AZ431BZ-BE1 AZ431BZ-BG1 AZ431BZ-BE1 AZ431BZ-BG1 Bulk
0.8% AZ431BZ-BTRE1 AZ431BZ-BTRG1 AZ431BZ-BE1 AZ431BZ-BG1 Ammo
0.4% AZ431AR-BTRE1 AZ431AR-BTRG1 E43C G43C Tape & Reel
0.8% AZ431BR-BTRE1 AZ431BR-BTRG1 E43D G43D Tape & Reel
E1: Lead Free
G1: Green
TR: Tape and Reel or Ammo
Blank: Bulk
B: AZ431-B (20V)
Part Number Marking ID
Lead Free Green Lead Free Green
Packing
Typ e
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green packages.
Dec. 2012 Rev. 3.3 BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B
Absolute Maximum Ratings (Note 2)
Parameter Symbol Value Unit
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
V
I
I
KA
KA
REF
20 V
-100 to 150 mA
10 mA
Z, R Package: 770
Power Dissipation
P
D
mW
N, K Package: 370
Junction Temperature
Storage Temperature Range
T
J
T
STG
150
-65 to 150
o
C
o
C
ESD (Human Body Model) ESD 2000 V
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
Parameter Symbol Min Max Unit
Cathode Voltage
Cathode Current
Operating Ambient
Temperature Range
V
KA
I
KA
T
A
Dec. 2012 Rev. 3.3 BCD Semiconductor Manufacturing Limited
V
REF
18 V
1.0 100 mA
-40 125
4
o
C
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B
Electrical Characteristics
Operating Conditions: TA=25oC, unless otherwise specified.
Parameter
Reference Voltage
0.4%
0.8% 2.480 2.500 2.520
Te st
Circuit
Deviation of Reference Voltage
Over Full Temperature Range
Ratio of Change in Reference
Voltage to the Change in
Cathode Voltage
Reference Current 5
Deviation of Reference Current
Over Full Temperature Range
Minimum Cathode Current for
Regulation
Off-state Cathode Current 6
Dynamic Impedance 4
Thermal Resistance
Symbol Conditions Min Typ Max Unit
2.490 2.500 2.510
C
4.5 8
4.5 10
4.5 16
-1.0 -2.7
-0.5 -2.0
0.7 4 μA
0.4 1.2 μA
0.4 1.0 mA
0.05 1.0 μA
0.2 0.5 Ω
REF
=10mA
o
C
0 to 70
-40 to 85
-40 to 125
=
ΔV
KA
10V to V
ΔV
=
KA
o
C
o
REF
4
4
5
V
REFVKA=VREF, IKA
REF
REF
KA
VKA=V
IKA= 10mA
IKA=10mA
ΔV
ΔV
ΔV
18V to 10V
I
REFIKA
5
4
ΔI
REF
I
KA
(Min)
I
KA
(Off)
Z
KA
=10mA, R1=10KΩ, R2=∞
IKA=10mA, R1=10KΩ, R2=∞
T
=-40 to 125oC
A
V
KA=VREF
=18V, V
V
KA
VKA=V
REF
=0
REF
, IKA=1 to 100mA
f ≤ 1.0KHz
SOT-23 177.65
SOT-23-5 177.65
θ
JC
TO-92 107.04
SOT-89 30.30
mV
mV/
o
C/W
V
V
Dec. 2012 Rev. 3.3 BCD Semiconductor Manufacturing Limited
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Data Sheet
I
OFF
V
IN
V
KA
V
IN
V
KA
R1
I
KA
V
REF
V
IN
V
KA
I
KA
R1
R2
V
REF
VKA=V
REF
(1+R1/R2)+ I
REF
*R1
I
REF
R3
ADJUSTABLE PRECISION SHUNT REGULATORS AZ431-B
Electrical Characteristics (Continued)
Figure 4. Test Circuit 4 for VKA=V
Figure 5. Test Circuit 5 for VKA>V
REF
REF
Figure 6. Test Circuit 6 for I
OFF
Dec. 2012 Rev. 3.3 BCD Semiconductor Manufacturing Limited
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