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| TL431 Programmable Precision References The TL431 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 2.5 volt reference makes it convenient to obtain a stable reference from 5.0 volt logic supplies, and since the TL431 operates as a shunt regulator, it can be used as either a positive or negative voltage reference. FEATURES l Programmable Output Voltage to 36 Volts l Low Dynamic Output Impedance, 0.22 Typical l Sink Current Capability of 1.0 to 100 mA l Equivalent Full-Range Temperature Coefficient of 50 ppm/ oC Typical l Temperature Compensated for operation over Full Rated Operating Temperature Range l Low Output Noise Voltage PIN ARRANGEMENT TO-92 DIP-8 Pin: 1. Reference 2. Anode 3. Cathode Pin: 1. Cathode 6. Anode 8. Reference Other Pins: NC SOP-8 CIRCUIT SCHEMATIC Pin: 1. 2. 3. 4. Cathode Anode Reference NC 5. 6. 7. 8. NC Anode Anode Reference SYMBOL FUNCTIONAL BLOCK DIAGRAM This SOP-8 is an internally modified SOP-8 Package. Pins 2, 3, 6 and 7 are electrically common to the die attach flag. This internal lead frame modification decreases package thermal resistance and increases power dissipation capability when appropriately mounted on a printed circuit board. This SOP-8 conforms to all external dimensions of the standard SOP-8 package. ORDERING INFORMATION Device TL431CT TL431CD TL431CS TL431IT TL431ID TL431IS Temperature Range 0 to +70 oC Package TO-92 DIP-8 SOP-8 TO-92 DIP-8 SOP-8 -40 to +85 oC 9-1 TL431 Programmable Precision References MAXIMUM RATINGS Rating Cathode to Anode Voltage (Full operating ambient temperature range applies unless otherwise noted.) Symbol VKA IK Iref TJ TA -40 to +85 0 to +70 T stg o Va l u e 37 -100 to +150 -0.05 to +10 150 Unit V mA mA o o Cathode Current Range, Continuous Reference Input Current Range, Continuous Operating Junction Temperature Operating Ambient Temperature Range TL431I, TL431AI, TL431BI TL431C, TL431AC, TL431BC Storage Temperature Range Total Power Dissipation @ TA = 25 C Derate above TA = 25oC Ambient Temperature T, S Suffix Packages D Suffix Package Total Power Dissipation @ TC = 25oC Derate above TA = 25oC Case Temperature T, S Suffix Packages D Suffix Package C C -65 to +150 o C PD 0.70 1.10 PD 1.5 3.0 W W THERMAL CHARACTERISTICS Characteristic Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Symbol R JA R JC T, S Suffix 178 83 D Suffix 114 41 Unit o o C/W C/W RECOMMENDED OPERATING CONDITIONS Condition / Value Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Symbol VA IK Min Vref 1.0 Max 36 100 Unit V mA 9-2 TL431 Programmable Precision References ELECTRICAL CHARACTERISTICS (Ambient temperature at 25oC unless otherwise noted) TL431I Typ Max TL431C Typ Max Characteristic Reference Input Voltage (Fig. 1) VKA = Vref, IK = 10mA TA = 25oC TA = Tlow to Thigh (Note 1) Reference Input Voltage Deviation Over Temperature Range (Fig. 1, Note 1, 2, 4) VKA = Vref, IK = 10mA Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage IK = 10mA (Fig. 2), VKA = 10V to Vref VKA = 36V to 10V Reference Input Current (Fig. 2) IK = 10mA, R1 = 10k, R2 = TA = 25oC TA = Tlow to Thigh (Note 1) 8 Reference Input Current Deviation Over Temperature Range (Fig. 2, Note 1, 4) IK = 10mA, R1 = 10k, R2 = 8 Minimum Cathode Current for Regulation VKA = Vref (Fig. 1) Off - State Cathode Current (Fig. 3) VKA = 36V, Vref = 0V Dynamic Impedance (Fig. 1, Note 3) VKA = Vref, IK = 1.0mA to 100mA, f < 1.0 kHz Symbol Vref Min Min Unit V 2.44 2.41 Vref --- 2.495 --7.0 2.55 2.58 30 2.44 2.423 --- 2.495 --3.0 2.55 2.567 17 mV Vref VKA ----Iref ----Iref --1.8 --0.8 4.0 6.5 2.5 ------1.8 --0.4 4.0 5.2 1.2 -1.4 -1.0 -2.7 -2.0 -----1.4 -1.0 -2.7 -2.0 mV/V A A Imin Ioff ZKA ------- 0.5 260 0.22 1.0 1000 0.5 ------- 0.5 2.6 0.22 1.0 1000 0.5 mA nA ELECTRICAL CHARACTERISTICS (Ambient temperature at 25oC unless otherwise noted) TL431AI Typ Max TL431AC Min Typ Max TL431B Typ Max Characteristic Reference Input Voltage (Fig. 1) VKA = Vref, IK = 10mA TA = 25oC TA = Tlow to Thigh (Note 1) Reference Input Voltage Deviation Over Temperature Range (Fig. 1, Note 1, 2, 4) VKA = Vref, IK = 10mA Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage IK = 10mA (Fig. 2), VKA = 10V to Vref VKA = 36V to 10V Reference Input Current (Fig. 2) IK = 10mA, R1 = 10k, R2 = TA = 25oC TA = Tlow to Thigh (Note 1) 8 Reference Input Current Deviation Over Temperature Range (Fig. 2, Note 1, 4) IK = 10mA, R1 = 10k, R2 = Minimum Cathode Current for Regulation VKA = Vref (Fig. 1) Off - State Cathode Current (Fig. 3) VKA = 36V, Vref = 0V Dynamic Impedance (Fig. 1, Note 3) VKA = Vref, IK = 1.0mA to 100mA, f < 1.0 kHz 8 Symbol Vref Min Min Unit V 2.47 2.44 Vref --- 2.495 --7.0 2.52 2.55 30 2.47 2.453 --- 2.495 --3.0 2.52 2.537 17 2.483 2.475 --- 2.495 2.495 3.0 2.507 2.515 17 mV Vref VKA ----Iref ----Iref --1.8 --0.8 4.0 6.5 2.5 ------1.8 --0.4 4.0 5.2 1.2 ------1.1 --0.4 2.0 4.0 1.2 -1.4 -1.0 -2.7 -2.0 -----1.4 -1.0 -2.7 -2.0 -----1.4 -1.0 -2.7 -2.0 mV/V A A Imin Ioff ZKA ------- 0.5 260 0.22 1.0 1000 0.5 ------- 0.5 260 0.22 1.0 1000 0.5 ------- 0.5 230 0.14 1.0 500 0.3 mA nA 9-3 9-4 |
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