Diodes AN431 User Manual
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
General Description
The AN431 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
age (36V).
The AN431 precision reference is offered in two voltage tolerance: 0.5% and 1.0%.
These ICs are available in SOT-23 package.
(2.5V) and the maximum cathode volt-
REF
Features
· Programmable Precise Output Voltage from 2.5V
to 36V
· High Stability under Capacitive Load
· Low Temperature Deviation: 4.5mV Typical
· Low Equivalent Full-range Temperature Coeffi-
o
cient with 20PPM/
· Low Dynamic Output Resistance: 0.15Ω Typical
· 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
SOT-23
Figure 1. Package Type of AN431
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
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Data Sheet
REF
V
REF
CATHODE
ANODE
+
-
3
21
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
Pin Configuration
N Package
(SOT-23)
ANODE
REFCATHODE
Figure 2. Pin Configuration of AN431 (Top View)
Functional Block Diagram
2
1
3
Figure 3. Functional Block Diagram of AN431
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
Ordering Information
AN431 -
Circuit Type
E1: Lead-Free
G1: Green
Condition
TR: Tape and Reel
A: 0.5%
B: 1.0%
Package
A: AN431 (40V)
N: SOT-23
Package
SOT-23
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.
Temperature
Range
-40 to
125oC
Condition
0.5% AN431AN-ATRE1 AN431AN-ATRG1 EB1 GB1 Tape & Reel
1.0%
Lead Free Green Lead Free Green
AN431BN-ATRE1 AN431BN-ATRG1 EB2 GB2 Tape & Reel
Part Number Marking ID
Packing Type
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
T
V
I
I
KA
REF
P
T
STG
KA
D
40 V
-100 to 150 mA
10 mA
370 mW
J
150
-65 to 150
o
C
o
C
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Power Dissipation
Junction Temperature
Storage Temperature Range
ESD (Human Body Model) ESD 2000 V
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 Symbol Min Max Unit
Cathode Voltage
Cathode Current
V
KA
I
KA
Operating Ambient Temperature Range -40 125
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
V
REF
36 V
1.0 100 mA
o
C
4
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
Electrical Characteristics
Operating Conditions: TA=25oC, unless otherwise specified.
Parameter
Reference Voltage
0.5%
1.0% 2.475 2.500 2.525
Test
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
4
4
V
ΔV
REF
REF
VKA=V
REF, IKA
VKA=V
REF
IKA=10mA
=10mA
0 to 70
-40 to 85
o
C
-40 to 125
ΔV
=
KA
ΔV
REF
5
ΔV
IKA=10mA
KA
10V to V
=
ΔV
KA
36V to 10V
I
REF
5
4
ΔI
I
(Min)
I
(Off)
Z
θ
IKA=10mA, R1=10KΩ, R2=∞
IKA=10mA, R1=10KΩ
REF
R2=∞, T
KA
V
KA=VREF
KA
V
KA
VKA=V
KA
f ≤ 1.0kHz
SOT-23 135
JC
=-40 to 125oC
A
=36V, V
REF
, IKA=1 to 100mA,
REF
=0
2.487 2.500 2.512
o
C
o
C
REF
V
4.5 8
4.5 10
mV
4.5 16
-1.0 -2.7
mV/V
-0.5 -2.0
0.7 4 μA
0.4 1.2 μA
0.4 1.0 mA
0.05 1.0 μA
0.15 0.5 Ω
o
C/W
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
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