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,
AZ431-A for 40V and AZ431-B for 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
Apr. 2005 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
1
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Ordering Information (Continued)
20V Products
Package
Tempera-
ture Range
-40 to 125
o
C
-40 to 125
o
C
Voltage
Tolerance
0.4%
0.8%
0.4%
0.8%
0.4%
TO-92
-40 to 125
o
C
0.4%
0.8%
0.8%
0.4%
SOIC-8
-40 to 125
o
C
0.4%
0.8%
0.8%
SOT-89
-40 to 125
o
C
0.4%
0.8%
Part Number
Tin Lead
AZ431AN-BTR
AZ431BN-BTR
AZ431AK-BTR
AZ431BK-BTR
AZ431AZ-B
AZ431AZ-BTR
AZ431BZ-B
AZ431BZ-BTR
AZ431AM-B
AZ431AM-BTR
AZ431BM-B
AZ431BM-BTR
AZ431AR-BTR
AZ431BR-BTR
Lead Free
AZ431AN-BTRE1
AZ431BN-BTRE1
AZ431AK-BTRE1
AZ431BK-BTRE1
AZ431AZ-BE1
AZ431AZ-BTRE1
AZ431BZ-BE1
AZ431BZ-BTRE1
AZ431AM-BE1
AZ431AM-BTRE1
AZ431BM-BE1
AZ431BM-BTRE1
AZ431AR-BTRE1
AZ431BR-BTRE1
Marking ID
Tin Lead
N44
N45
K4A
K4B
AZ431AZ-B
AZ431AZ-B
AZ431BZ-B
AZ431BZ-B
AZ431AM-B
AZ431AM-B
AZ431BM-B
AZ431BM-B
431C
431D
Lead Free
EA4
EA5
E4A
E4B
AZ431AZ-BE1
AZ431AZ-BE1
AZ431BZ-BE1
AZ431BZ-BE1
AZ431AM-BE1
AZ431AM-BE1
AZ431BM-BE1
AZ431BM-BE1
E43C
E43D
Packing
Type
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Bulk
Ammo
Bulk
Ammo
Tube
Tape & Reel
Tube
Tape & Reel
Tape & Reel
Tape & Reel
AZ431
SOT-23-3
SOT-23-5
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Apr. 2005 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
4
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
Value
AZ431 (40V): 40
V
AZ431 (20V): 20
-100 to +150
10
M,Z,R Package: 770
mW
N,K Package: 370
160
-65 to +150
M Package: 150
N Package: 330
Package Thermal Impedance
θ
JA
Z Package: 150
R Package: 50
K Package: 250
o
C/W
o
o
AZ431
Unit
mA
mA
C
C
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 Maximum
Ratings" for extended periods may affect device reliability.
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
Apr. 2005 Rev. 1. 7
BCD Semiconductor Manufacturing Limited
5
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