Diodes AN431 User Manual

Page 1
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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Page 2
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
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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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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 AN431
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. 2. 0 BCD Semiconductor Manufacturing Limited
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Data Sheet
-60 -40 -20 0 20 40 60 80 100 120 140
0.0
0.5
1.0
1.5
R1=10K,R2=
I
KA
=10mA
Reference Current (μA)
Ambient Temperature (0C)
-60 -40 -20 0 20 40 60 80 100 120 140
2.485
2.490
2.495
2.500
2.505
2.510
Reference Voltage (V)
Ambient Temperature (oC)
VKA=V
REF
IKA=10mA
-2 -1 0 1 2 3
-100
-50
0
50
100
150
Cathode Current (mA)
Cathode Voltage (V)
VKA=V
REF
TA=250C
-1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5
-200
0
200
400
600
800
Cathode Current (μA)
Cathode Voltage (V)
VKA=V
REF
TA=250C
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
Typical Performance Characteristics
Figure 7. Reference Voltage vs. Ambient Temperature Figure 8. Reference Current vs. Ambient Temperature
Figure 9. Cathode Current vs. Cathode Voltage Figure 10. Cathode Current vs. Cathode Voltage
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
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Data Sheet
-40 -20 0 20 40 60 80 100 120
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Off-state Cathode Current (μA)
Ambient Temperature (oC)
VKA=36V
V
REF
=0
-40-200 20406080100120
-1.4
-1.3
-1.2
-1.1
-1.0
-0.9
VKA=3.5V to 36V
ΔV
REF
/ ΔV
KA
(mV/V)
Ambient Temperature (oC)
10μF
8.2K
15K
I
KA
Output
242
GND
1k 10k 100k 1M
-10
0
10
20
30
40
50
60
70
Voltage Gain (dB)
Small Signal Frequency (Hz)
TA=250C
I
KA
=10mA
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
Typical Performance Characteristics (Continued)
Figure 11. Off-state Cathode Current vs. Figure 12. Ratio of Delta Reference Voltage to the
Ambient Temperature
Ratio of Delta Cathode Voltage
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
Figure 13. Small Signal Voltage Gain vs. Frequency
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Data Sheet
1K 10K 100K 1,000K
0.1
1
10
Reference Impedance (Ω)
Frequency (Hz)
IKA=10mA
T
A
=25oC
GND
Output
50
1K
I
KA
I
KA
R1 (10K)
R2
150
0
10
20
30
40
50
60
70
80
90
100
10
1
0.10.01
StableStable
Cathode Current (mA)
Load Capacitance (μF)
VKA=V
REF
VKA= 5V
VKA=10V
VKA=15V
0.001
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
Typical Performance Characteristics (Continued)
Figure 14. Reference Impedance vs. Frequency
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
Figure 15. Stability Boundary Conditions vs. Load Capacitance
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Data Sheet
Pulse Generator f=100KHz
220
50
Output
GND
0246
0
1
2
3
4
5
Input
Input and Output Voltage (V)
Time (μS)
Output
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
Typical Performance Characteristics (Continued)
Figure 16. Pulse Response of Input and Output Voltage
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
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Data Sheet
V
IN
V
OUT
R1
R2
V
REF
AN431
R3
V
IN V
OUT
R4
R1
R2
V
REF
R3
AN431
I
OUT
V
IN
AN431
R2
R1
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
Typical Application
V
=(1+R1/R2)*V
OUT
Figure 17. Shunt Regulator
REF
Figure 18. High Current Shunt Regulator
V
=(1+R2/R3)*V
OUT
I
OUT=VREF
/R2 + I
REF
KA
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
Figure 19. Current Source or Current Limit
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Data Sheet
AZ1117
V
IN
V
OUT
Adjust
8.2K
AN431
R1
R2
R3
250
250
5V, 1A
PWM Controller
C1
R1
R2 680
U2
3
4
PS521
C2
2
R3
R4
R5
V
OUT
AN431
Q1
COMP
VFB
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
Typical Application (Continued)
Figure 20. Precision 5V 1A Regulator
Figure 21. PWM Converter with Reference
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
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Data Sheet
2.300(0.091)
2.500(0.098)
1.200(0.047)
1.400(0.055)
0.920(0.036)
0.980(0.039)
0.300(0.012)
0.500(0.020)
1.900(0.075)REF
2.800(0.110)
3.000(0.118)
2.0°
3.0 °
0.500(0.020)
0.700(0.028)
1.050(0.041)REF
0.020(0.001)
0.100(0.004)
0.900(0.035)
1.100(0.043)
4×
R0.100(0.004)
7.0°
7.0°
0.550(0.022)REF
0.200(0.008)MIN
0.100(0.004) GAUGE PLANE
0.080(0.003)
0.150(0.006)
R0.100(0.004)
0.0°~10.0°
ADJUSTABLE PRECISION SHUNT REGULATORS AN431
Mechanical Dimensions
SOT-23 Unit: mm(inch)
Dec. 2012 Rev. 2. 0 BCD Semiconductor Manufacturing Limited
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BCD Semiconductor Manufacturing Limited
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particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use
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