AN431 Programmable Precise Output Voltage from 2.5V High Stabilit
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AN431 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). AN431 precision reference offered voltage tolerance: 0.5% 1.0%. These available SOT-23 package.
AN431
Programmable Precise Output Voltage from 2.5V 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 100mA Output Noise Wide Operating Range 125oC
Applications
Charger Voltage Adapter Switching Power Supply Graphic Card Precision Voltage Reference
SOT-23
Figure Package Type AN431
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Configuration
Package (SOT-23)
ANODE
AN431
CATHODE
Figure Configuration AN431 (Top View)
Functional Block Diagram
CATHODE
VREF
ANODE
Figure Functional Block Diagram AN431
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Ordering Information AN431
AN431 Circuit Type Voltage Tolerance 0.5% 1.0%
Package
Lead-Free Tape Reel
AN431 (40V)
SOT-23
Package SOT-23
Temperature Range 125oC
Voltage Tolerance 0.5% 1.0%
Part Number AN431AN-ATRE1 AN431BN-ATRE1
Marking
Packing Type Tape Reel Tape Reel
Semiconductor's Pb-free products, designated with "E1" suffix part number, RoHS compliant.
Mar. 2007 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 (Human Body Model) Symbol IREF TSTG Value -100 2000 Unit
AN431
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
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Electrical Characteristics
Operating Conditions: TA=25oC, unless otherwise specified.
Parameter Reference Voltage 0.5% 1.0% Test Circuit Symbol VREF Conditions VKA=VREF, IKA=10mA 70oC Deviation Reference Voltage Over Full Temperature Range VREF VKA=VREF IKA=10mA 85oC 125oC Ratio Change Reference Voltage Change Cathode Voltage Reference Current Deviation Reference Current Over Full Temperature Range Minimum Cathode Current Regulation Off-state Cathode Current VREF IREF IREF (Min) (Off) VKA= VREF VKA= 2.487 2.475 2.500 2.500 -1.0 -0.5 2.512 2.525 -2.7 mV/V -2.0 Unit
AN431
IKA=10mA
IKA=10mA, R1=10K, IKA=10mA, R1=10K R2=, TA=-40 125oC VKA=VREF VKA=36V, VREF=0 VKA=VREF, IKA=1 100mA, 1.0kHz
0.05
Dynamic Impedance
0.15
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Electrical Characteristics (Continued) AN431
VREF
Figure Test Circuit VKA=VREF
IREF VKA=VREF*(1+R1/R2)+ IREF*R1 VREF
Figure Test Circuit VKA>VREF
IOFF
Figure Test Circuit IOFF
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Performance Characteristics AN431
2.510 VKA=VREF 2.505 Reference Voltage IKA=10mA
R1=10K,R2= IKA=10mA Reference Current (µA)
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
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Performance Characteristics (Continued) AN431
VKA=36V VREF=0
-0.9
VKA=3.5V
Off-state Cathode Current (µA)
-1.0
VREF (mV/V)
-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
TA=25 IKA=10mA
10µF
Voltage Gain (dB)
8.2K
100k
Small Signal Frequency (Hz)
Figure Small Signal Voltage Gain Frequency
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Performance Characteristics (Continued) AN431
Output
IKA=10mA
Reference Impedance
TA=25
100K 1,000K
Frequency (Hz)
Figure Reference Impedance Frequency
VKA=VREF VKA= VKA=10V VKA=15V Stable Stable
(10K)
Cathode Current (mA)
0.001
0.01
Load Capacitance (µF)
Figure Stability Boundary Conditions Load Capacitance
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Performance Characteristics (Continued) AN431
Input Input Output Voltage
Output
Output
Pulse Generator f=100KHz
Time (µS)
Figure Pulse Response Input Output Voltage
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Application
AN431
VOUT=(1+R1/R2)*VREF
AN431
Figure Shunt Regulator
VREF
VOUT
VOUT=(1+R2/R3)*VREF
AN431
Figure High Current Shunt Regulator
IOUT=VREF/R2
AN431
Figure Current Source Current Limit
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Typical Application (Continued) AN431
8.2K
AZ1117 Adjust AN431
VOUT
Figure Precision Regulator
VOUT
AN431
COMP
Controller
PS521
Figure Converter with Reference
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
Data Sheet ADJUSTABLE PRECISION SHUNT REGULATORS Mechanical Dimensions SOT-23 Unit: mm(inch) AN431
Mar. 2007 Rev.
Semiconductor Manufacturing Limited
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