TS431

TS431/431A/431B Adjustable Precision Shunt Regulator Sink Current Capability up to 100mA General Description The TS431/431A/431B 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 0.22Ω. 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 TS431/431A/431B 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, SOT-89, SOT-23 and SOP-8 package. Features Precision Reference Voltage TS431 2.495V±2% TS431A 2.495V±1% TS431B 2.495V±0.5% 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: 0.22Ω Low Output Noise o Standard Application Ordering Information Part No. TS431xCT TS431xCY TS431xCX TS431xCS Note: Where x denotes voltage tolerance. Blank: ±2% A: ±1% B: ±0.5% -20 ~ +85 oC Block Diagram Operating Temp. (Ambient) Package TO-92 SOT-89 SOT-23 SOP-8 Pin Assignment Pin No. TS431/A/BCT 1 2 3 TS431/A/BCY 1 2 3 TS431/A/BCX 1 3 2 TS431/A/BCS 8 2,3,6,7 1 4,5 Pin Description Reference Anode Cathode Non connect TS431/A/B 1-8 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-89 / SOP-8 SOT-23 Operating Junction Temperature Range Storage Temperature Range Note 2: Tj Max = 150 C Note 3: Rating apply to ambient temperature at 25 C o o Vka Ik Iref 37 -100 ~ +150 -0.05 ~ +10 0.625 V mA mA Pd 0.5 0.3 W o o Tj TSTG +125 -65 ~ +150 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 C, unless otherwise specified.) Parameter Reference voltage TS431 TS431A TS431B 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=10KΩ, R2= ∞ , Ika=10mA (Figure 2) Ika=10mA, Vka = 10V to Vref, Vka = 36V to 10V (Figure 2) Ta= full range Iref(DEV) R1=10KΩ, R2= ∞ , Ika=10mA (Figure 2) Ika(min) Ioff |Zka| Vka=Vref (Figure 1) Vref=0V (Figure 3) f