LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Data Sheet
1
Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
General Description
The AZ431L series ICs are low voltage three-terminal
adjustable 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, motherboard and
other adjustable regulators.
The output voltage can be set to any value between
1.24V and 18V with two external resistors.
The AZ431L precision reference is offered in two volt-
age tolerance: 0.5% and 1.0%.
These ICs are available in 4 packages: TO-92 (bulk or
ammo packing), SOT-23, SOT-23-5 and SOT-89.
Features
·Wide Programmable Precise Output Voltage from
1.24V to 18V
·High Stability under Capacitive Load
·Low Temperature Deviation: 3mV Typical
·Low Equivalent Full-range Temperature Coeffi-
cient: 20PPM/oC Typical
·Low Dynamic Output Resistance: 0.05Ω Typical
·High Sink Current Capacity from 0.1mA to
100mA
·Low Output Noise
·Wide Operating Range of -40 to 125oC
Applications
·Graphic Card
·PC Motherboard
·Voltage Adapter
·Switching Power Supply
·Charger
Figure 1. Package Types of AZ431L
SOT-23
TO-92(Bulk Packing)SOT-89
SOT-23-5
TO-92(Ammo Packing)
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Data Sheet
2
Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
Note 1: Pin 2 is attached to substrate and
must be connected to ANODE or open
Figure 2. Pin Configuration of AZ431L (Top View)
Z Package
(TO-92(Bulk Packing)) (SOT-23)
N Package
R Package
(SOT-89)
Figure 3. Functional Block Diagram of AZ431L
Functional Block Diagram
K Package
(SOT-23-5)
REF
VREF
CATHODE
ANODE
+
-
Pin Configuration
Z Package
(TO-92(Ammo Packing))
ANODE
REF CATHODE
3
21
CATHODE
ANODE
REF
1
2
3
CATHODE
ANODE
REF
1
2
3
NC ANODE
REF
1
2
34
5
REF ANODE CATHODE
123
*
(Note 1)
*
CATHODE
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
Ordering Information
Circuit Type
Voltage Tolerance
B: 1.0%
A: 0.5%
G1: Green
AZ431L -
Package Temperature
Range
Voltage
Tolerance
Part Number Marking ID Packing
Type
Lead Free Green Lead Free Green
TO-92 -40 to 125oC
0.5% AZ431LAZ-E1 AZ431LAZ-G1 AZ431LAZ-E1 AZ431LAZ-G1 Bulk
0.5% AZ431LAZTR-E1 AZ431LAZTR-G1 AZ431LAZ-E1 AZ431LAZ-G1 Ammo
1.0% AZ431LBZ-E1 AZ431LBZ-G1 AZ431LBZ-E1 AZ431LBZ-G1 Bulk
1.0% AZ431LBZTR-E1 AZ431LBZTR-G1 AZ431LBZ-E1 AZ431LBZ-G1 Ammo
SOT-23 -40 to 125oC
0.5% AZ431LANTR-E1 AZ431LANTR-G1 EA6 GA6 Tape & Reel
1.0% AZ431LBNTR-E1 AZ431LBNTR-G1 EA7 GA7 Tape & Reel
SOT-23-5 -40 to 125oC
0.5% AZ431LAKTR-E1 AZ431LAKTR-G1 E5A G5A Tape & Reel
1.0% AZ431LBKTR-E1 AZ431LBKTR-G1 E6A G6A Tape & Reel
SOT-89 -40 to 125oC
0.5% AZ431LARTR-E1 AZ431LARTR-G1 E41A G41A Tape & Reel
1.0% AZ431LBRTR-E1 AZ431LBRTR-G1 E41B G41B Tape & Reel
Package
Z: TO-92
TR: Tape and Reel or Ammo
Blank: Bulk
N: SOT-23
K: SOT-23-5
R: SOT-89
E1: Lead Free
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.
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Data Sheet
4
Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
Parameter Symbol Value Unit
Cathode Voltage VKA 20 V
Cathode Current Range (Continuous) IKA -100 to 100 mA
Reference Input Current Range IREF 10 mA
Power Dissipation PD
Z, R Package 770
mW
N, K Package 370
Junction Temperature TJ 150 oC
Storage Temperature Range TSTG -65 to 150 oC
Note 2: 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 Maxi-
mum Ratings" for extended periods may affect device reliability.
Parameter Symbol Min Max Unit
Cathode Voltage VKA VREF 18 V
Cathode Current IKA 0.1 100 mA
Operating Ambient Temperature Range -40 125 oC
Recommended Operating Conditions
Absolute Maximum Ratings (Note 2)
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Parameter Test
Circuit Symbol Conditions Min Typ Max Unit
Reference Voltage 0.5% 4 VREF VKA=VREF, IKA=10mA 1.234 1.240 1.246 V
1.0% 1.228 1.240 1.252
Deviation of Reference Voltage
Over Full Temperature Range
4
∆VREF
VKA=VREF
IKA=10mA
0oC to 70oC2 10
mV
-40oC to 85oC310
-40oC to 125oC415
Ratio of Change in VREF to the
Change in Cathode Voltage 5 ∆VREF
∆VKA
IKA=10mA,
∆VKA:VREF to 16V -0.5
-1.5
mV/V
Reference Input Current 5 IREF IKA=10mA, R1=10KΩ, R2=∞ 0.15 0.4 µA
Deviation of Reference Current
Over Full Temperature Range 5 ∆IREF
IKA=10mA, R1=10KΩ, R2=∞
TA=-40 to 125oC0.1 0.4 µA
Minimum Cathode Current for
Regulation 4 IKA
(Min) VKA=VREF 55 80 µA
Off-state Cathode Current 6 IKA
(Off)
VREF=0, VKA=18V 0.04 0.10 µA
VKA=6, VREF=0 0.01 0.05
Dynamic Impedance 4 ZKA
VKA=VREF, IKA=1 to 100mA
f≤ 1.0kHz 0.05 0.15 Ω
Thermal Resistance θJC
SOT-23 84.84
oC/W
SOT-23-5 84.84
TO-92 140.80
SOT-89 88.00
(Operating Conditions: TA=25oC, unless otherwise noted.)
Electrical Characteristics
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
Figure 4. Test Circuit 4 for VKA=VREF
Figure 5. Test Circuit 5 for VKA>VREF
Figure 6. Test Circuit 6 for IOFF
IOFF
VIN VKA
VIN VKA
IKA
R1
R2 VREF
VKA=VREF*(1+R1/R2)+ IREF*R1
IREF
R3
VIN VKA
R1
IKA
VREF
Electrical Characteristics (Continued)
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
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
-50 -25 0 25 50 75 100 125 150
1.235
1.236
1.237
1.238
1.239
1.240
1.241
1.242
Reference Voltage (V)
Ambient Temperature (oC)
VKA=VREF
IKA=10mA
-50 -25 0 25 50 75 100 125
0.12
0.13
0.14
0.15
0.16
0.17
0.18 R1=10KΩ
R2=Infinite
IKA=10mA
Ambient Temperature (oC)
Reference Current (µA)
-1 0 1
-150
-100
-50
0
50
100
150
Cathode Current (mA)
Cathode Voltage (V)
VKA=VREF
TA=25oC
-1 0 1
-300
-200
-100
0
100
200
300
400
Cathode Current (µA)
Cathode Voltage (V)
VKA=VREF
TA=25oC
Typical Performance Characteristics
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
Figure 11. Small Signal Voltage Gain vs. Frequency
10µF
4.3K
6.8K IKA
Output
360
GND
5V
1k 10k 100k 1M
0.01
0.1
1
10
IKA=1mA to 100mA
Dynamic Impedance (Ω)
Frequency (Hz)
Figure 12. Dynamic Impedance vs. Frequency
GND
Output
50Ω
100Ω
IKA
Typical Performance Characteristics (Continued)
1k 10k 100k
-10
0
10
20
30
40
50
60
70
Voltage Gain (dB)
Small Signal Frequency (Hz)
TA=250C
IKA=10mA
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Figure 13. Pulse Response of Input and Output Voltage
Pulse
Generator
f=100KHz
R2
50Ω
Output
GND
R1
1.8KΩ
-40-20 0 20406080100120
-0.55
-0.50
-0.45
-0.40
-0.35
-0.30
IKA=10mA
∆VKA=VREF to 16V
Ratio of ∆VREF to ∆VKA (mV/V)
Ambient Temperature (oC)
Figure 14. Ratio of Delta Reference Voltage to the Ratio of
Cathode Voltage vs. Ambient Temperature
Typical Performance Characteristics (Continued)
-10123456
0
1
2
3
Input
Input and output voltage (V)
Time (µS)
Output
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
Figure 15. Shunt Regulator
Figure 16. High Current Shunt Regulator
VOUT=(1+R1/R2)*VREF
V
OUT
=(1+R2/R3)*V
REF
IOUT=VREF/R2+IKA
VIN VOUT
R1
R2
VREF AZ431L
R3
IOUT
VIN
AZ431L
R2
R1
VIN VOUT
R4
R1
R2
VREF
R3
AZ432
VIN VOUT
R4
R1
R2
VREF
R3
AZ431L
Figure17. Current Source or Current Limit
Typical ApplicationS
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Figure 19. PWM Converter with Reference
Figure18. Precision 5V 1A Regulator
AZ1117
VIN
8.2K
AZ431L
R1
R2
R3
250
250
5V/1A
PWM Controller
C1
R1
R2 680
U2
3
4
PS521
C2
2
R3 R4
R5
VOUT
AZ431L
Q1
COMP
VFB
Typical Application (Continued)
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
Mechanical Dimensions
TO-92(Bulk Packing) Unit: mm(inch)
2.420(0.095)
2.660(0.105)
0.360(0.014)
0.760(0.030)
Φ
1.600(0.063)
MAX
12.500(0.492)
15.500(0.610)
1.270(0.050)
TYP
3.300(0.130)
3.700(0.146)
4.300(0.169)
4.700(0.185)
1.000(0.039)
1.400(0.055)
4.400(0.173)
4.800(0.189)
3.430(0.135)
MIN
0.320(0.013)
0.510(0.020)
0.000(0.000)
0.380(0.015)
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
Unit: mm(inch)
Mechanical Dimensions (Continued)
Unit: mm(inch)
Φ
TO-92(Ammo Packing)
4.300(0.169)
4.700(0.185)
12.500(0.492)
14.500(0.571)
2.540(0.100)
Typ
1.270(0.050)
Typ
0. (0.015)
0.550(0.022 )
4.400(0.173
)
4.800(0.189
)
3. 430(0.135)
MIN
0. 320(0. 013)
0.510(0.020)
0.000(0.000)
0. 380(0. 015)
MAX
1. 100(0. 043
1. 400(0. 055
)
3.300(0.130)
3.800(0.150)
Φ
1.600(0.063)
)
380
2.500(0.098
)
4.000(0.157
)
13. 000(0. 512
)
15.000(0.591
)
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
Mechanical Dimensions (Continued)
SOT-23 Unit: mm(inch)
2.300(0.091)
2.500(0.098)
1.200(0.047)
1.400(0.055)
0.920(0.036)
0.980(0.039)
0.390(0.015)
0.450(0.018)
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°
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Mechanical Dimensions (Continued)
SOT-23-5 Unit: mm(inch)
2.820(0.111)
2.650(0.104)
1.500(0.059)
0.000(0.000)
0.300(0.012)
0.950(0.037)
0.900(0.035)
0.100(0.004)
0.200(0.008)
0.300(0.012)
8°
0°
3.020(0.119)
1.700(0.067)
2.950(0.116)
0.400(0.016)
0.150(0.006)
1.300(0.051)
0.200(0.008)
0.600(0.024)
1.800(0.071)
2.000(0.079)
0.700(0.028)
REF
TYP
1.450(0.057)
MAX
LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR AZ431L
Data Sheet
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Aug. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
Mechanical Dimensions (Continued)
SOT-89 Unit: mm(inch)
45
1.030(0.041)REF
1.550(0.061)REF
4.400(0.173)
4.600(0.181)
0.900(0.035)
1.100(0.043)
3.950(0.156)
4.250(0.167)
3.000(0.118)
TYP
0.480(0.019)
2.300(0.091)
2.600(0.102)
0.320(0.013)
0.520(0.020)
310
2.060(0.081)REF
1.400(0.055)
1.600(0.063)
0.350(0.014)
0.450(0.018)
R0.150(0.006)
3
10
1.500(0.059)
0.320(0.013)REF
1.620(0.064)REF
2.210(0.087)REF
0.320(0.013)
0.520(0.020)
1.800(0.071)
IMPORTANT NOTICE
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility fo r use of any its products for any
particular purpose, nor does BCD Semiconductor Man ufacturing Limited assume any liability arising out of the application or use
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
other rights nor the rights of others.
- Wafer Fab
Shanghai SIM-BCD Semiconductor Manufacturing Limited
800, Yi Shan Road, Shanghai 200233, China
Tel: +86-21-6485 1491, Fax: +86-21-5450 0008
BCD Semiconductor Manufacturing Limited
MAIN SITE
REGIONAL SALES OFFICE
Shenzhen Office
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd. Shenzhen Office
Advanced Analog Circuits (Shanghai) Corporation Shenzhen Office
Room E, 5F, Noble Center, No.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China
Tel: +86-755-8826 7951
Fax: +86-755-8826 7865
Taiwan Office
BCD Semiconductor (Taiwan) Company Limited
4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,
Taiwan
Tel: +886-2-2656 2808
Fax: +886-2-2656 2806
USA Office
BCD Semiconductor Corporation
30920 Huntwood Ave. Hayward,
CA 94544, U.S.A
Tel : +1-510-324-2988
Fax: +1-510-324-2788
- IC Design Group
Advanced Analog Circuits (Shanghai) Corporation
8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China
Tel: +86-21-6495 9539, Fax: +86-21-6485 9673
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
BCD Semiconductor Manufacturing Limited
IMPORTANT NOTICE
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any
particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
other rights nor the rights of others.
- Wafer Fab
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
800 Yi Shan Road, Shanghai 200233, China
Tel: +86-21-6485 1491, Fax: +86-21-5450 0008
MAIN SITE
REGIONAL SALES OFFICE
Shenzhen Office
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., Shenzhen Office
Unit A Room 1203, Skyworth Bldg., Gaoxin Ave.1.S., Nanshan District, Shenzhen,
China
Tel: +86-755-8826 7951
Fax: +86-755-8826 7865
Taiwan Office
BCD Semiconductor (Taiwan) Company Limited
4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,
Taiwan
Tel: +886-2-2656 2808
Fax: +886-2-2656 2806
USA Office
BCD Semiconductor Corp.
30920 Huntwood Ave. Hayward,
CA 94544, USA
Tel : +1-510-324-2988
Fax: +1-510-324-2788
- Headquarters
BCD Semiconductor Manufacturing Limited
No. 1600, Zi Xing Road, Shanghai ZiZhu Science-based Industrial Park, 200241, China
Tel: +86-21-24162266, Fax: +86-21-24162277
