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| TS1431/1431A/1431B Adjustable Precision Shunt Regulator Pin Assignment: 1. Cathode 2. Reference 3. Anode Sink Current Capability up to 100mA General Description The TS1431/1431A/1431B 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 2.5volt reference makes it convenient to obtain a stable reference from 5.0volt logic supplies, and since The TS1431/1431A/1431B operates as a shunt regulator, it can be used as either a positive or negative stage reference. This series is offered in 3-pin TO-92 and SOT-23 package. Features Precision Reference Voltage TS1431 2.495V2% Standard Application TS1431A 2.495V1% TS1431B 2.495V0.5% o Equivalent Full Range Temp. Coefficient: 50ppm/ C Programmable Output Voltage up to 36V Fast Turn-On Response Sink Current Capability of 1.0 to 100 mA Low Dynamic Output Impedance: 0.22 Low Output Noise Ordering Information Part No. TS1431xCT TS1431xCX Block Diagram Operating Temp. (Ambient) o -20 ~ +85 C Package TO-92 SOT-23 Note: Where x denotes voltage tolerance. Blank: 2% A: 1% B: 0.5% TS1431/A/B 1-7 2003/12 rev. B Absolute Maximum Rating Cathode Voltage (Note 1) Continuous Cathode Current Range Reference Input Current Range Power Dissipation (Note 2, 3) TO-92 SOT-23 Operating Junction Temperature Range Storage Temperature Range Note 2: Tj Max = 125oC Note 3: Rating apply to ambient temperature at 25 oC Vka Ik Iref Pd Tj TSTG 37 -100 ~ +150 -0.05 ~ +10 0.625 0.3 -25 ~ +125 -65 ~ +150 V mA mA W o o C C Note 1: Voltage values are with respect to the anode terminal unless otherwise noted. Recommend Operating Condition Cathode Voltage Range Cathode Current Range (for regulation) Vka Ik Ref ~ 36 1 ~ 100 V mA Electrical Characteristics (Ta=25 oC, unless otherwise specified.) Parameter Reference voltage TS1431 TS1431A TS1431B Deviation of reference input voltage, over temp. (Note 4) Reference Input current Radio of change in Vref to change in cathode Voltage Deviation of reference input current, over temp. Minimum operating cathode current Off-state Cathode Current Dynamic Output Impedance Vref Ta = full range Vka =Vref, Ik=10mA (Figure 1) R1=10K, R2= , Ika=10mA (Figure 2) Ika=10mA, Vka = 10V to Vref, Vka = 36V to 10V (Figure 2) Ta= full range Iref(DEV) R1=10K, R2= , Ika=10mA (Figure 2) Ika(min) Ioff |Zka| Vka=Vref (Figure 1) Vref=0V (Figure 3) f<1KHz, Vka=Vref Ika=1mA to 100mA (Figure 1) Vka=36V ---0.4 -0.22 0.6 1.0 0.5 mA uA -0.4 1.2 uA Vref Vka =Vref, Ik=10mA (Figure 1) Symbo Test Conditions Min 2.446 2.470 2.483 -3 2.495 Typ Max 2.545 2.520 2.507 17 mV V Unit Iref Vref / Vka ---- 0.7 -1.4 - 1.0 4.0 -2.7 - 2.0 uA mV/V TS1431/A/B 2-7 2003/12 rev. B Electrical Characteristics (continued) (Ta=25 oC, unless otherwise specified.) Note 4. Deviation of reference input voltage, VDEV, is defined as the maximum deviation of the reference over the full temperature range. The average temperature coefficient of the reference input voltage Vref is defined as: | Vref | = [ VDEV / Vref(25 oC) ] * 106 / T2 - T1.......................... (PPM/ oC) Where: T2-T1 = full temperature change. Vref can be positive or negative depending on whether the slope is positive or negative. | Vref | = [ 4mV / 2495mV ] * 106 / 70oC 23ppm/oC Note 5. The dynamic output impedance, Rz, is defined as: Example: Maximum Vref=2.496V at 30oC, minimum Vref=2.492V at 0oC, Vref=2.495V at 25oC, T=70 oC | Zka | = Vka / Ika When the device is programmed with two external resistors R1and R2 (see Figure 2). The dynamic output impedance of the overall circuit, is defined as : | Zka | = v / i | Zka | * ( 1 + R1 / R2) Test Circuits TS1431/A/B 3-7 2003/12 rev. B Application Examples TS1431/A/B 4-7 2003/12 rev. B Application Examples TS1431/A/B 5-7 2003/12 rev. B Typical Performance Characteristics TS1431/A/B 6-7 2003/12 rev. B TO-92 Mechanical Drawing A DIM B C E F 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 H D G SOT-23 Mechanical Drawing A B F DIM A B C D E F G SOT-23 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 2.88 2.91 0.113 0.115 0.39 0.42 0.015 0.017 1.78 2.03 0.070 0.080 0.51 0.61 0.020 0.024 1.59 1.66 0.063 0.065 1.04 1.08 0.041 0.043 0.07 0.09 0.003 0.004 E G D C TS1431/A/B 7-7 2003/12 rev. B |
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