BCD AN431AN-BTRG1 Adjustable precision shunt regulator Datasheet

Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
General Description
Features
The AN431-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 AN431-B can be set to any value
between VREF (2.5V) and the corresponding maximum
cathode voltage.
The AN431-B precision reference is offered in two
voltage tolerance: 0.5% and 1.0%.
This IC is available in SOT-23 package.
·
·
·
·
·
·
AN431-B
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 Coefficient with 20PPM/oC Typical
Sink Current Capacity from 1mA to 100mA
Low Output Noise
Wide Operating Range of -40 to 125oC
Applications
·
·
·
·
·
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
SOT-23
Figure 1. Package Type of AN431-B
Jan. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
1
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Pin Configuration
N Package
(SOT-23)
ANODE
3
1
2
CATHODE
REF
Figure 2. Pin Configuration of AN431-B (Top View)
Functional Block Diagram
CATHODE
1
REF
2
+
-
VREF
3
ANODE
Figure 3. Functional Block Diagram of AN431-B
Jan. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Ordering Information
AN431
-
Circuit Type
G1: Green
Voltage Tolerance
A: 0.5%
B: 1.0%
TR: Tape &Reel
Package
N: SOT-23
B: AN431-B (20V)
Package
Temperature
Range
SOT-23
-40 to 125oC
Voltage Tolerance
Part Number
Marking ID
Packing Type
0.5%
AN431AN-BTRG1
GB3
Tape & Reel
1.0%
AN431BN-BTRG1
GB4
Tape & Reel
BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and Green.
Jan. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
3
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Cathode Voltage
VKA
20
V
Cathode Current Range (Continuous)
IKA
-100 to 150
mA
Reference Input Current Range
IREF
10
mA
Power Dissipation
PD
370
mW
Junction Temperature
TJ
150
Storage Temperature Range
TSTG
-65 to 150
oC
ESD (Human Body Model)
ESD
2000
V
o
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
Symbol
Min
Max
Unit
Cathode Voltage
VKA
VREF
18
V
Cathode Current
IKA
1.0
100
mA
Operating Ambient
Temperature Range
TA
-40
125
o
Jan. 2011 Rev. 1. 0
C
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Electrical Characteristics
Operating Conditions: TA=25oC, unless otherwise specified.
Parameter
Reference Voltage
0.5%
1.0%
Deviation of Reference Voltage
Over Full Temperature Range
Test
Circuit
Symbol
4
VREF
4
∆VREF
Conditions
Min
Typ
Max
2.487
2.500
2.512
2.475
2.500
2.525
0 to 70oC
4.5
8
-40 to 85oC
4.5
10
-40 to 125oC
4.5
16
∆VKA=
10V to VREF
-1.0
-2.7
∆VKA=
18V to 10V
-0.5
-2.0
0.7
4
µA
0.4
1.2
µA
VKA=VREF, IKA=10mA
VKA=VREF
IKA= 10mA
Unit
V
mV
Ratio of Change in Reference
Voltage to the Change in
Cathode Voltage
5
Reference Current
5
IREF
Deviation of Reference Current
Over Full Temperature Range
5
∆IREF
Minimum Cathode Current for
Regulation
4
IKA
(Min)
VKA=VREF
0.4
1.0
mA
Off-state Cathode Current
6
IKA
(Off)
VKA=18V, VREF=0
0.05
1.0
µA
Dynamic Impedance
4
ZKA
VKA=VREF, IKA=1 to 100mA
f ≤ 1.0KHz
0.2
0.5
Ω
θJC
SOT-23
Thermal Resistance
∆VREF
∆VKA
IKA=10mA
IKA=10mA, R1=10KΩ, R2=∞
IKA=10mA, R1=10KΩ, R2=∞
TA=-40 to 125oC
Jan. 2011 Rev. 1. 0
177.65
mV/
V
oC/W
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Electrical Characteristics (Continued)
R1
VKA
VIN
IKA
VREF
Figure 4. Test Circuit 4 for VKA=VREF
R3
VIN
VKA
IKA
R1
IREF
VKA=VREF(1+R1/R2)+ IREF*R1
R2
VREF
Figure 5. Test Circuit 5 for VKA>VREF
VKA
VIN
IOFF
Figure 6. Test Circuit 6 for IOFF
Jan. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Typical Performance Characteristics
1.5
2.510
VKA = VREF
Reference Current (µA)
Reference Voltage (V)
R1=10K,R2=Infinite
IKA = 10mA
2.505
2.500
2.495
IKA=10mA
1.0
0.5
2.490
2.485
-60
-40
-20
0
20
40
60
80
100
120
0.0
-60
140
-40
-20
0
o
60
80
100
120
140
Figure 8. Reference Current vs. Ambient Temperature
800
VKA=VREF
VKA=VREF
0
TA=25 C
0
TA=25 C
600
100
Cathode Current (µA)
Cathode Current (mA)
40
Ambient Temperature ( C)
Figure 7. Reference Voltage vs. Ambient Temperature
150
20
0
Ambient Temperature ( C)
50
0
400
200
0
-50
-200
-100
-2
-1
0
1
2
-1.0
3
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
Cathode Voltage (V)
Cathode Voltage (V)
Figure 9. Cathode Current vs. Cathode Voltage
Figure 10. Cathode Current vs. Cathode Voltage
Jan. 2011 Rev. 1. 0
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Typical Performance Characteristics (Continued)
1.8
VKA=18V
1.6
VREF=0
-0.9
∆VREF / ∆VKA (mV/V)
Off-State Cathode Current (µA)
2.0
1.4
1.2
1.0
0.8
0.6
0.4
VKA=3.5V to 18V
-1.0
-1.1
-1.2
-1.3
0.2
-1.4
0.0
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
120
Ambient Temperature ( C)
Ambient Temperature ( C)
Figure 11. Off-State Cathode Current vs.
Ambient Temperature
Figure 12. Ratio of Delta Reference Voltage to the
Ratio of Delta Cathode Voltage
Output
70
0
TA=25 C
60
15K
IKA=10mA
50
Voltage Gain (dB)
100
o
o
I KA
242
10µF
40
30
20
8.2K
10
0
-10
1k
10k
100k
GND
1M
Small Signal Frequency (Hz)
Figure 13. Small Signal Voltage Gain vs. Frequency
Jan. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Typical Performance Characteristics (Continued)
Output
IKA=10mA
1K
Reference Impedance (Ω)
o
10
TA=25 C
IKA
50
1
GND
0.1
1K
10K
100K
1,000K
Frequency (Hz)
Figure 15. Reference Impedance vs. Frequency
Cathode Current (mA)
20
18
VKA=10V:No oscillation
16
VKA=15V:No oscillation
R1 (10K)
14
12
150
IKA
Stable
Stable
10
8
6
4
R2
VKA=VREF
VKA=5V
2
0
0.01
0.1
1
10
Load Capacitance (µF)
Figure 16. Stability Boundary Conditions vs. Load Capacitance
Jan. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Typical Performance Characteristics (Continued)
5
Input and Output Voltage (V)
Input
Output
4
220
Pulse
Generator
f=100KHz
3
Output
2
50
1
0
GND
0
2
4
6
Time (µS)
Figure 18. Pulse Response of Input and Output Voltage
Jan. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Typical Application
R3
VOUT
VIN
R1
VOUT=(1+R1/R2)*VREF
VREF
AN431-B
R2
Figure 19. Shunt Regulator
VIN
VOUT
R1
R4
R2
VOUT=(1+R2/R3)*VREF
VREF
AN431-B
R3
Figure 20. High Current Shunt Regulator
R2
VIN
IOUT
IOUT=VREF/R2 + IKA
R1
AN431-B
Figure 21. Current Source or Current Limit
Jan. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Typical Application (Continued)
VIN
AZ1117
R1
8.2K
VOUT
Adjust
5V, 1A
R2
250
AN431-B
R3
250
Figure 22. Precision 5V 1A Regulator
R3
C1
R4
VOUT
R2 680
R5
R1
U2
Q1
3
COMP
C2
2
AN431-B
PWM Controller
VFB
4
PS521
Figure 23. PWM Converter with Reference
Jan. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AN431-B
Mechanical Dimensions
SOT-23
3.0 °
2.0°
1.050(0.041)REF
7.0°
R0.100(0.004)
0.900(0.035)
1.100(0.043)
0.0°~10.0°
0.020(0.001)
0.100(0.004) 0.200(0.008)MIN
2.800(0.110)
3.000(0.118)
0.550(0.022)REF
7.0°
0.080(0.003)
0.150(0.006)
1.200(0.047)
1.400(0.055)
2.300(0.091)
2.500(0.098)
0.920(0.036)
0.980(0.039)
0.100(0.004) GAUGE PLANE
4×R0.100(0.004)
0.500(0.020)
0.700(0.028)
Unit: mm(inch)
0.390(0.015)
0.450(0.018)
1.900(0.075)REF
Jan. 2011 Rev. 1. 0
BCD Semiconductor Manufacturing Limited
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