TS1431 Adjustable Precision Shunt Regulator SOT-23 Pin Definition: 1. Cathode 2. Reference 3. Anode General Description TS1431 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 TS1431 series operates as a shunt regulator, it can be used as either a positive or negative stage reference. Features Ordering Information Precision Reference Voltage Part No. Package Packing TS1431 2.495V2% TS1431xCX RF SOT-23 3Kpcs / 7 Reel TS1431A 2.495V1% TS1431xCX RFG SOT-23 3Kpcs / 7 Reel TS1431B 2.495V0.5% Note: G denote for Green Product Equivalent Full Range Temp. Coefficient: 50ppm/ C Where xx denotes voltage tolerance Programmable Output Voltage up to 36V Blank: 2%, A: 1%, B: 0.5% Fast Turn-On Response Sink Current Capability of 1~100mA Low Dynamic Output Impedance: 0.2 Low Output Noise Application Block Diagram Voltage Monitor Delay Timmer Constant Current Source/Sink High-Current Shunt Regulator Crow Bar Over-Voltage / Under-Voltage Protection o Absolute Maximum Rating (Ta = 25 C unless otherwise noted) Parameter Symbol Limit Unit Cathode Voltage Vka 36 V Continuous Cathode Current Range Ik 1 ~ +100 mA Reference Input Current Range Iref -0.05 ~ +10 mA Power Dissipation Pd 0.30 W o Junction Temperature Tj +150 C o Operating Temperature Range Toper 0 ~ +70 C o Storage Temperature Range Tstg -65 ~ +150 C 1/10 Version: C07 TS1431 Adjustable Precision Shunt Regulator Recommend Operating Condition Parameter Symbol Limit Unit Cathode Voltage (Note 1) V Ref ~ 36 V KA Continuous Cathode Current Range I 1 ~ 100 mA K Recommend Operating Condition Parameter Symbol Test Conditions Min Typ Max Unit TS1431 2.450 2.550 V =V , I =10mA (Figure 1) KA REF K Reference voltage TS1431A V 2.475 2.495 2.525 V REF o Ta=25 C TS1431B 2.487 2.513 Deviation of reference input V = V , I =10mA (Figure 1) KA REF K V -- 3 17 mV REF voltage Ta= full range Radio of change in Vref to I =10mA, V = 10V to V -- -1.4 -2.7 KA KA REF V /V mV/V REF KA change in cathode Voltage V = 36V to 10V (Figure 2) -- -1.0 -2.0 KA R1=10K, R2= , I =10mA KA Reference Input current I -- 0.7 4.0 uA REF Ta= full range (Figure 2) Deviation of reference input R1=10K, R2= , I =10mA KA I -- 0.4 1.2 uA REF current, over temp. Ta= full range (Figure 2) V =0V (Figure 3), REF Off-state Cathode Current I (off) -- -- 1.0 uA KA V =36V KA f<1KHz, V = V KA REF Dynamic Output Impedance Z -- 0.22 0.5 KA I =1mA to 100mA (Figure 1) KA Minimum operating cathode I (min) V = V (Figure 1) -- 0.4 0.6 mA KA KA REF current * The deviation parameters V and I are defined as difference between the maximum value and minimum value REF REF obtained over the full operating ambient temperature range that applied. * The average temperature coefficient of the reference input voltage, V is defined as: REF Where: T2-T1 = full temperature change. V can be positive or negative depending on whether the slope is positive or negative. REF o o o o Example: Maximum V =2.496V at 30 C, minimum V =2.492V at 0 C, V =2.495V at 25 C, T=70 C REF REF REF 6 o o V = 4mV / 2495mV * 10 / 70 C 23ppm/ C REF Because minimum V occurs at the lower temperature, the coefficient is positive. REF * The dynamic impedance ZKA is defined as: Z = V / I KA KA KA * 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: Z = v / i Z * ( 1 + R1 / R2) KA KA 2/10 Version: C07