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TS2431
Adjustable Precision Shunt Regulator
TO-92 SOT-89
Pin Definition: 1. Reference 2. Anode 3. Cathode
SOT-23
Pin Definition: 1. Cathode 2. Reference 3. Anode
SOP-8
Pin Definition: 1. Cathode 8. Reference 2. Anode 7. Anode 3. Anode 6. Anode 4. N/C 5. N/C
General Description
TS2431 series integrated circuits are three-terminal programmable shunt regulator diodes. These monolithic IC voltage references operate as a low temperature coefficient zener which is programmable from VREF to 36 volts with two external resistors. These devices exhibit a wide operating current range of 1.0 to 100mA with a typical dynamic impedance of 0.22. The characteristics of these references make them excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5V reference makes it convenient to obtain a stable reference from 5.0V logic supplies, and since The TS2431 series operates as a shunt regulator, it can be used as either a positive or negative stage reference.
Features
Precision Reference Voltage TS2431 - 2.495V2% TS2431A - 2.495V1% TS2431B - 2.495V0.5% Equivalent Full Range Temp. Coefficient: 50ppm/ C Programmable Output Voltage up to 36V Fast Turn-On Response Sink Current Capability of 1~100mA Low Dynamic Output Impedance: 0.2 Low Output Noise
Ordering Information
Part No. Package Packing
TS2431xCT B0 TO-92 1Kpcs / Bulk TS2431xCT A3 TO-92 2Kpcs / Ammo TS2431xCX RF SOT-23 3Kpcs / 7" Reel TS2431xCY RM SOT-89 1Kpcs / 7" Reel TS2431xCS RL SOP-8 2.5Kpcs / 13" Reel Note: Where xx denotes voltage tolerance Blank: 2% A: 1% B: 0.5%

Application
Voltage Monitor Delay Timmer Constant -Current Source/Sink High-Current Shunt Regulator Crow Bar Over-Voltage / Under-Voltage Protection
Block Diagram
Absolute Maximum Rating (Ta = 25oC unless otherwise noted)
Parameter
Cathode Voltage (Note 1) Continuous Cathode Current Range Reference Input Current Range
Symbol
VKA IK IREF
Limit
Unit
V mA mA W
o o
37 -100 ~ +150 -0.05 ~ +10 TO-92 0.625 PD Power Dissipation SOT-23 0.30 SOT-89 / SOP-8 0.50 Junction Temperature TJ +150 Operating Temperature Range TOPER 0 ~ +70 Storage Temperature Range TSTG -65 ~ +150 Note 1: Voltage values are with respect to the anode terminal unless otherwise noted. 1/13
C C o C
Version: E07
TS2431
Adjustable Precision Shunt Regulator
Recommend Operating Condition
Parameter
Cathode Voltage (Note 1) Continuous Cathode Current Range
Symbol
VKA IK
Limit
Ref ~ 36 1 ~ 100
Unit
V mA
Recommend Operating Condition
Parameter
TS2431 TS2431A TS2431B Deviation of reference input voltage Radio of change in Vref to change in cathode Voltage Reference voltage Reference Input current Deviation of reference input current, over temp. Off-state Cathode Current Dynamic Output Impedance
Symbol
VREF VREF VREF /VKA IREF IREF IKA (off) | ZKA |
Test Conditions
VKA =VREF, IK =10mA (Figure 1) o Ta=25 C VKA = VREF, IK =10mA (Figure 1) Ta= full range IKA =10mA, VKA = 10V to VREF VKA = 36V to 10V (Figure 2) R1=10K, R2= , IKA =10mA Ta= full range (Figure 2) R1=10K, R2= , IKA =10mA Ta= full range (Figure 2) VREF =0V (Figure 3), VKA =36V f<1KHz, VKA = VREF IKA =1mA to 100mA (Figure 1)
Min
2.450 2.475 2.487 --------
Typ
2.495 3 -1.4 -1.0 0.7 0.4 -0.22
Max
2.550 2.525 2.513 12 -2.7 -2.0 4.0 1.2 1.0 0.5
Unit
V mV mV/V uA uA uA
Minimum operating cathode IKA (min) VKA = VREF (Figure 1) -0.4 0.6 mA current * The deviation parameters VREF and IREF are defined as difference between the maximum value and minimum value obtained over the full operating ambient temperature range that applied. * The average temperature coefficient of the reference input voltage, VREF is defined as:
Where: T2-T1 = full temperature change. VREF can be positive or negative depending on whether the slope is positive or negative. o o o o Example: Maximum VREF=2.496V at 30 C, minimum VREF =2.492V at 0 C, VREF =2.495V at 25 C, T=70 C
VREF | = [4mV / 2495mV] * 106 / 70oC 23ppm/oC
Because minimum VREF occurs at the lower temperature, the coefficient is positive. * The dynamic impedance ZKA is defined as:
| ZKA | = VKA / IKA
* When the device operating with two external resistors, R1 and R2, (refer to Figure 2) the total dynamic impedance of the circuit is given by: | ZKA | = v / i | ZKA | * ( 1 + R1 / R2)
2/13
Version: E07
TS2431
Adjustable Precision Shunt Regulator
Test Circuits
Figure 1: VKA = VREF
Figure 2: VKA > VREF
Figure 3: Off-State Current
Additional Information - Stability
When The TS2431/2431A/2431B is used as a shunt regulator, there are two options for selection of CL, are recommended for optional stability: A) No load capacitance across the device, decouple at the load. B) Large capacitance across the device, optional decoupling at the load. The reason for this is that TS2431/2431A/2431B exhibits instability with capacitances in the range of 10nF to 1uF (approx.) at light cathode current up to 3mA (typ). The device is less stable the lower the cathode voltage has been set for. Therefore while the device will be perfectly stable operating at a cathode current of 10mA (approx.) with a 0.1uF capacitor across it, it will oscillate transiently during start up as the cathode current passes through the instability region. Select a very low capacitance, or alternatively a high capacitance (10uF) will avoid this issue altogether. Since the user will probably wish to have local decoupling at the load anyway, the most cost effective method is to use no capacitance at all directly across the device. PCB trace/via resistance and inductance prevent the local load decoupling from causing the oscillation during the transient start up phase. Note: if the TS2431/2431A/2431B is located right at the load, so the load decoupling capacitor is directly across it, then this capacitor will have to be 1nF or 10uF.
Applications Examples
Figure 4: Voltage Monitor
Figure 5: Output Control for Three Terminal Fixed Regulator
3/13 Version: E07
TS2431
Adjustable Precision Shunt Regulator
Applications Examples (Continue)
Figure 6: Shunt Regulator
Figure 7: High Current Shunt Regulator
Figure 8: Series Pass Regulator
Figure 9: Constant Current Source
Figure 10: TRIAC Crowbar
Figure 11: SCR Crowbar
4/13
Version: E07
TS2431
Adjustable Precision Shunt Regulator
Applications Examples (Continue)
Vin Vref
Vout V+ 0.74V
Figure 12: Single-Supply Comparator with Temperature-Compensated Threshold
Figure 13: Constant Current Sink
Figure 14: Delay Timer
5/13
Version: E07
TS2431
Adjustable Precision Shunt Regulator
Typical Performance Characteristics
Test Circuit for Voltage Amplification
Figure 14: Small-Signal Voltage Gain and Phase Shirt vs. Frequency
Test Circuit for Reference Impedance
Figure 15: Reference Impedance vs. Frequency
6/13
Version: E07
TS2431
Adjustable Precision Shunt Regulator
Typical Performance Characteristics (Continue)
Test Circuit for Curve A
The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V+ were adjusted to establish the initial VKA and IKA conditions with CL=0. VBATT and CL then were adjusted to determine the ranges of stability.
Test Circuit for Curve B, C and D
Figure 16: Stability Boundary Condition
Test Circuit for Pulse Response, Ik=1mA
Figure 17: Pulse Response
7/13
Version: E07
TS2431
Adjustable Precision Shunt Regulator
Electrical Characteristics
Figure 18: Reference Voltage vs. Temperature
Figure 19: Reference Current vs. Temperature
Figure 20: Cathode Current vs. Cathode Voltage
8/13
Version: E07
TS2431
Adjustable Precision Shunt Regulator
TO-92 Mechanical Drawing
DIM A B C D E F G H
TO-92 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 4.30 4.70 0.169 0.185 4.30 4.70 0.169 0.185 14.30(typ) 0.563(typ) 0.43 0.49 0.017 0.019 2.19 2.81 0.086 0.111 3.30 3.70 0.130 0.146 2.42 2.66 0.095 0.105 0.37 0.43 0.015 0.017
Marking Diagram
X = Tolerance Code (A = 1%, B = 0.5%, Blank = 2%,) Y = Year Code M = Month Code (A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oct, K=Nov, L=Dec) L = Lot Code
9/13
Version: E07
TS2431
Adjustable Precision Shunt Regulator
SOT-23 Mechanical Drawing
DIM A A1 B C D E F G H I J
SOT-23 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX. 0.95 BSC 0.037 BSC 1.9 BSC 0.074 BSC 2.60 3.00 0.102 0.118 1.40 1.70 0.055 0.067 2.80 3.10 0.110 0.122 1.00 1.30 0.039 0.051 0.00 0.10 0.000 0.004 0.35 0.50 0.014 0.020 0.10 0.20 0.004 0.008 0.30 0.60 0.012 0.024 5 10 5 10
Marking Diagram
X = Tolerance Code (A = 1%, B = 0.5%, C = 2%,) 2 = Device Code Y = Year Code M = Month Code (A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oct, K=Nov, L=Dec) L = Lot Code
10/13
Version: E07
TS2431
Adjustable Precision Shunt Regulator
SOT-89 Mechanical Drawing
DIM A B C D E F G H I J
SOT-89 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 4.40 4.60 0.173 0.181 1.50 1.7 0.059 0.070 2.30 2.60 0.090 0.102 0.40 0.52 0.016 0.020 1.50 1.50 0.059 0.059 3.00 3.00 0.118 0.118 0.89 1.20 0.035 0.047 4.05 4.25 0.159 0.167 1.4 1.6 0.055 0.068 0.35 0.44 0.014 0.017
Marking Diagram
Y M = Year Code = Month Code (A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oct, K=Nov, L=Dec) L = Lot Code CY = Package Code
11/13
Version: E07
TS2431
Adjustable Precision Shunt Regulator
SOP-8 Mechanical Drawing
DIM A B C D F G K M P R
SOP-8 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX. 4.80 5.00 0.189 0.196 3.80 4.00 0.150 0.157 1.35 1.75 0.054 0.068 0.35 0.49 0.014 0.019 0.40 1.25 0.016 0.049 1.27BSC 0.05BSC 0.10 0.25 0.004 0.009 0 7 0 7 5.80 6.20 0.229 0.244 0.25 0.50 0.010 0.019
Marking Diagram
Y M = Year Code = Month Code (A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep, J=Oct, K=Nov, L=Dec) = Lot Code
L
12/13
Version: E07
TS2431
Adjustable Precision Shunt Regulator
Notice
Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC's terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify TSC for any damages resulting from such improper use or sale.
13/13
Version: E07

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