AS431 Programmable Precise Output Voltage from 2.5V Very Accurate
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AS431 series three-terminal adjustable shunt regulators with guaranteed thermal stability over full operation range. These feature sharp turn-on characteristics, temperature coefficient output impedance, which make them ideal substitutes Zener diodes applications such switching power supply, charger other adjustable regulators. output voltage these value between VREF (2.5V) maximum cathode voltage (36V). AS431 precision reference offered bandgap tolerance: 0.4% 0.8%. These available Packages: TO-92, SOT-233, SOT-23-5 SOT-89
AS431
Programmable Precise Output Voltage from 2.5V Very Accurate Reference Voltage: 0.15% Typical High Stability under Capacitive Load Temperature Deviation: 4.5mV Typical Equivalent Full-range Temperature Coefficient with 20PPM/oC Typical Dynamic Output Resistance: 0.15 Typical Sink Current Capacity from Output Noise Wide Operating Range 125oC
Applications
Charger Voltage Adapter Switching Power Supply Graphic Card Precision Voltage Reference
SOT-89
TO-92
SOT-23-3
SOT-23-5
Figure Package Types AS431
Nov. 2005 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Configuration
Package (SOT-23-3)
ANODE
AS431
Package (SOT-89)
CATHODE
ANODE CATHODE
Package (TO-92)
Package (SOT-23-5)
CATHODE ANODE
CATHODE
ANODE
Figure Configuration AS431 (Top View)
Functional Block Diagram
CATHODE
VREF
ANODE
Figure Functional Block Diagram AS431
Nov. 2005 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Ordering Information AS431
AS431 Circuit Type Bandage Tolerance 0.4% 0.8%
Package
Lead-Free
Blank: Lead
Tape Reel Ammo
Blank: Tube Bulk
SOT-23-3 SOT-89
SOT-23-5 TO-92
Package
Temperature Range 125oC 125oC
Voltage Tolerance 0.4% 0.8% 0.4% 0.8% 0.4%
Part Number Lead Lead Free AS431ANTR-E1 AS431BNTR-E1 AS431AKTR-E1 AS431BKTR-E1 AS431AZ-E1 AS431AZTR-E1 AS431BZ-E1 AS431BZTR-E1 AS431ARTR-E1 AS431BRTR-E1
Marking Lead Lead Free 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
125oC
0.4% 0.8% 0.8%
SOT-89
125oC
0.4% 0.8%
Semiconductor's Pb-free products, designated with "E1" suffix part number, RoHS compliant.
Nov. 2005 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Absolute Maximum Ratings (Note
Parameter Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Power Dissipation Junction Temperature Storage Temperature Range Symbol IREF TSTG Value -100 Package: Package: Package: Package Thermal Impedance Package: Package: Package: (Human Body Model) 4000
oC/W
AS431
Unit
Note Stresses greater than those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated under "Recommended Operating Conditions" implied. Exposure "Absolute Maximum Ratings" extended periods affect device reliability.
Recommended Operating Conditions
Parameter Cathode Voltage Cathode Current Operating Ambient Temperature Range Symbol VREF Unit
Nov. 2005 Rev.
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Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Electrical Characteristics AS431
Operating Conditions: TA=25oC, unless otherwise specified.
Parameter Reference Voltage Deviation Reference Voltage Over-temperature Ratio Change Reference Voltage Change Cathode Voltage Reference Current Deviation Reference Current Over Full Temperature Range Minimum Cathode Current Regulation Off-state Cathode Current 0.4% 0.8% Test Circuit Symbol VREF VREF Conditions VKA=VREF, IKA=10mA VKA=VREF IKA=10mA 70oC
AS431
AS431 2.490 2.480 2.500 2.500 -1.0 -0.5 2.510 2.520
Unit
-2.7 mV/V -2.0
VREF IREF IREF (Min) (Off)
IKA=10mA
VKA= VREF VKA=
IKA=10mA, R1=10K, IKA=10mA, R1=10K R2=, TA=-40 85oC VKA=VREF VKA=36V, VREF=0 VKA=VREF, IKA=1 100mA, 1.0KHz
0.05
Dynamic Impedance
0.15
Nov. 2005 Rev.
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Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Electrical Characteristics (Continued) AS431
VREF
Figure Test Circuit VKA=VREF
IREF VKA=VREF(1+R1/R2)+ IREF VREF
Figure Test Circuit VKA>VREF
IOFF
Figure Test Circuit IOFF
Nov. 2005 Rev.
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Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Performance Characteristics AS431
2.510 VREF 2.505 Reference Voltage 10mA
Reference Current (µA)
R1=10K,R2=Infinite IKA=10mA
2.500
2.495
2.490
2.485
Ambient Temperature
Ambient Temperature
Figure Reference Voltage Ambient Temperature
Figure Reference Current Ambient Temperature
VKA=VREF TA=25
Cathode Current (µA) -200
VKA=VREF TA=25
Cathode Current (mA)
-100
-1.0
-0.5
Cathode Voltage
Cathode Voltage
Figure Cathode Current Cathode Voltage
Figure Cathode Current Cathode Voltage
Nov. 2005 Rev.
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Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Performance Characteristics (Continued) AS431
VKA=36V VREF=0
VREF (mV/V)
-0.9
VKA=3.5V
Off-state Cathode Current (µA)
-1.0
-1.1
-1.2
-1.3
-1.4
Ambient Temperature
Ambient Temperature
Figure Off-state Cathode Current Ambient Temperature
Figure Ratio Delta Reference Voltage Ratio Delta Cathode Voltage
Output
100K 1000K
10µF
10mA
(dB)
8.2K
100K 1000K Small Signal Frequency
Figure Small Signal Voltage Gain Frequency
Nov. 2005 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Performance Characteristics (Continued) AS431
IKA=10mA
Reference Impedance
TA=25
Output
100K
1,000K
Frequency (Hz)
Figure Reference Impedance Frequency
(10K)
Stable Stable
Cathode Current (mA)
0.001
TA=25 VKA=VREF VKA= 5V:No oscillation VKA=10V:No oscillation VKA=15V:No oscillation
0.01
Load Capacitance (µF)
Figure Stability Boundary Conditions Load Capacitance
Nov. 2005 Rev.
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Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Performance Characteristics (Continued) AS431
Input Input Output Voltage
Output
Output
Pulse Generator f=100KHz
Time (µS)
Figure Pulse Response Input Output Voltage
Nov. 2005 Rev.
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Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Application
AS431
VOUT=(1+R1/R2)
AS431
Figure Shunt Regulator
VREF
VOUT
VOUT=(1+R2/R3)*VREF
AS431
Figure High Current Shunt Regulator
Iout
IOUT=VREF/R2
AS431
Figure Current Source Current Limit
Nov. 2005 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Application (Continued) AS431
8.2K
AZ1117 Adjust AS431
VOUT
Figure Precision Regulator
VOUT
AS431
COMP
Controller
PS521
Figure Converter with Reference
Nov. 2005 Rev.
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Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Mechanical Dimensions TO-92 Unit: (inch) AS431
1.100(0.043) 1.400(0.055) 3.430(0.135) 0.360(0.014) 0.510(0.020)
3.300(0.130)
3.700(0.146)
0.000(0.000) 0.380(0.015) 1.600(0.063) 4.400(0.173) 4.700(0.185)
4.300(0.169)
4.700(0.185)
0.380(0.015) 0.550(0.022)
1.270(0.050)
2.440(0.096) 2.640(0.104)
Nov. 2005 Rev.
14.100(0.555) 14.500(0.571)
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Mechanical Dimensions (Continued) SOT-23-3 Unit: mm(inch) AS431
0.500(0.020) 0.700(0.028)
0.100(0.004) GAUGE PLANE 7.0°
0.900(0.035) 1.100(0.043)
R0.100(0.004)
2.0° 1.050(0.041)REF
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)
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
Nov. 2005 Rev.
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Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Mechanical Dimensions (Continued) SOT-23-5 Unit: mm(inch) AS431
2.820(0.111) 3.020(0.119)
0.100(0.004) 0.200(0.008)
2.650(0.104)
2.950(0.116)
1.500(0.059) 1.700(0.067)
0.200(0.008)
0.700(0.028)
0.950(0.037)
0.300(0.012) 0.400(0.016) 1.800(0.071) 2.000(0.079)
0.300(0.012) 0.600(0.024)
1.050(0.041)
1.250(0.049)
0.000(0.000) 0.100(0.004)
1.050(0.041) 1.150(0.045)
Nov. 2005 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Mechanical Dimensions (Continued) SOT-89 Unit: mm(inch) AS431
1.630(0.064) 1.830(0.072) 1.400(0.055)*
4.400(0.173) 4.600(0.181)
0.000(0.000) 0.076(0.003)
1.400(0.055) 1.600(0.063)
R0.200(0.008)
3.950(0.156) 4.250(0.167) 1.200(0.047) 0.900(0.035) 2.300(0.091) 2.600(0.102)
0.360(0.014) 0.480(0.019) 3.000(0.118)
0.360(0.014) 0.480(0.019) 0.440(0.017) 0.560(0.022)
0.360(0.014) 0.440(0.017)
R0.150(0.006)
Nov. 2005 Rev.
Semiconductor Manufacturing Limited
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