Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
General Description
The AS431 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 output voltage of these ICs can be set to any value
between V
REF
(2.5V) and the maximum cathode volt-
age (36V).
The AS431 precision reference is offered in two band-
gap tolerance: 0.4% and 0.8%.
These ICs are available in 4 Packages: TO-92, SOT-23-
3, SOT-23-5 and SOT-89 .
AS431
Features
·
·
·
·
·
·
·
·
·
Programmable Precise Output Voltage from 2.5V
to 36V
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: 0.15Ω 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
SOT-89
TO-92
SOT-23-3
SOT-23-5
Figure 1. Package Types of AS431
Nov. 2005 Rev. 1. 1
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BCD Semiconductor Manufacturing Limited
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Pin Configuration
N Package
(SOT-23-3)
ANODE
AS431
R Package
(SOT-89)
3
1
2
1
2
3
REF
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 AS431 (Top View)
Functional Block Diagram
CATHODE
REF
+
-
V
REF
ANODE
Figure 3. Functional Block Diagram of AS431
Nov. 2005 Rev. 1. 1
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BCD Semiconductor Manufacturing Limited
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Ordering Information
AS431
AS431
Circuit Type
Bandage Tolerance
A: 0.4%
B: 0.8%
Package
-
E1: Lead-Free
Blank: Tin Lead
TR: Tape and Reel or Ammo
Blank: Tube or Bulk
N: SOT-23-3
R: SOT-89
K: SOT-23-5
Z: TO-92
Package
Temperature
Range
-40 to 125
o
C
-40 to 125
o
C
Voltage
Tolerance
0.4%
0.8%
0.4%
0.8%
0.4%
Part Number
Tin Lead
Lead Free
AS431ANTR-E1
AS431BNTR-E1
AS431AKTR-E1
AS431BKTR-E1
AS431AZ-E1
AS431AZTR-E1
AS431BZ-E1
AS431BZTR-E1
AS431ARTR-E1
AS431BRTR-E1
Marking ID
Tin Lead
Lead Free
EB5
EB6
E6H
E6I
AS431AZ-E1
AS431AZ-E1
AS431BZ-E1
AS431BZ-E1
E43G
E43H
Packing
Type
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
Bulk
Ammo
Bulk
Ammo
Tape & Reel
Tape & Reel
SOT-23-3
SOT-23-5
TO-92
-40 to 125
o
C
0.4%
0.8%
0.8%
SOT-89
-40 to 125
o
C
0.4%
0.8%
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Nov. 2005 Rev. 1. 1
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BCD Semiconductor Manufacturing Limited
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
40
-100 to 150
10
Z, R Package: 770
mW
N, K Package: 370
160
-65 to 150
N Package: 330
Package Thermal Impedance
θ
JA
Z Package: 150
R Package: 50
K Package: 250
ESD (Human Body Model)
4000
V
o
o
o
AS431
Unit
V
mA
mA
C
C
C/W
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
36
100
125
Unit
V
mA
o
C
Nov. 2005 Rev. 1. 1
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BCD Semiconductor Manufacturing Limited
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Electrical Characteristics for AS431
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
0.4%
0.8%
Test
Circuit
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
AS431
Min
2.490
2.480
Typ
2.500
2.500
4.5
4.5
-1.0
-0.5
0.7
0.4
0.4
Max
2.510
2.520
8
mV
10
-2.7
mV/V
-2.0
4
1.2
1.0
µA
µA
Unit
V
AS431
4
5
∆V
REF
∆V
KA
I
REF
∆I
REF
I
KA
(Min)
I
KA
(Off)
Z
KA
I
KA
=10mA
5
5
4
I
KA
=10mA, R1=10KΩ, R2=∞
I
KA
=10mA, R1=10KΩ
R2=∞, T
A
=-40 to 85 C
V
KA
=V
REF
V
KA
=36V, V
REF
=0
V
KA
=V
REF
, I
KA
=1 to 100mA,
f
≤
1.0KHz
o
mA
µA
Ω
6
0.05
1.0
Dynamic Impedance
4
0.15
0.5
Nov. 2005 Rev. 1. 1
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BCD Semiconductor Manufacturing Limited
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