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ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor's product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. "Typical" parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. LM431A / LM431B / LM431C Programmable Shunt Regulator Features Description * * * * The LM431A / LM431B / LM431C are three-terminal output adjustable regulators with thermal stability over the full operating temperature range. The output voltage can be set to any value between VREF (approximately 2.5 V) and 36 V with two external resistors. These devices have a typical dynamic output impedance of 0.2 . Active output circuit provides a sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications. Programmable Output Voltage to 36 V Low Dynamic Output Impedance: 0.2 (Typical) Sink Current Capability: 1.0 to 100 mA Equivalent Full-Range Temperature Coefficient of 50 ppm/C (Typical) * Temperature Compensated for Operation Over Full Rated Operating Temperature Range * Low Output Noise Voltage * Fast Turn-on Response TO-92 1 1. Ref 2. Anode 3. Cathode 8-SOIC 1 1.Cathode 2.3.6.7.Anode 4.5.NC 8.Ref Ordering Information Part Number Operating Output Voltage Temperature Tolerance Range LM431CCZ Top Mark 0.5% LM431CCMX LM431BCZX LM431BCZXA LM431BCMX -25 ~ +85C 1% LM431ACZ LM431ACZX 2% LM431BIZX LM431AIZ -40 ~ +85C LM431AIMX (c) 2003 Fairchild Semiconductor Corporation LM431A / LM431B / LM431C Rev. 1.2.0 Packing Method LM431CCZ TO-92 Bulk LM431CCM 8-SOIC Tape and Reel LM431BCZ TO-92 Tape and Reel LM431BCZ TO-92 Ammo LM431BCM 8-SOIC Tape and Reel LM431ACZ TO-92 Bulk LM431ACZ TO-92 Tape and Reel LM431ACM 8-SOIC Tape and Reel 0.5% LM431CIM 8-SOIC Tape and Reel 1% LM431BIZ TO-92 Tape and Reel LM431AIZ TO-92 Bulk LM431AIM 8-SOIC Tape and Reel LM431ACMX LM431CIMX Package 2% www.fairchildsemi.com 1 LM431A / LM431B / LM431C -- Programmable Shunt Regulator June 2013 REFERENCE CATHODE + 2.5 Ref ANODE CATHODE (K) REFERENCE (R) ANODE (A) Figure 1. Block Diagram Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Values are at TA = 25C unless otherwise noted. Symbol Parameter Value Unit VKA Cathode Voltage 37 V IKA Cathode Current Range (Continuous) -100 ~ +150 mA IREF Reference Input Current Range -0.05 ~ +10 mA 770 mW 160 C/W Operating Temperature Range LM431xC -25 ~ +85 C Operating Temperature Range LM431xI -40 ~ +85 C 150 C -65 ~ +150 C PD RjA TOPR TJ TSTG Power Dissipation TO-92, 8-SOIC Packages Thermal Resistance, Junction to Ambient TO-92, 8-SOIC Packages Junction Temperature Storage Temperature Range Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol Parameter Min. Max. Unit VKA Cathode Voltage VRef 36 V IKA Cathode Current 1.0 100 mA (c) 2003 Fairchild Semiconductor Corporation LM431A / LM431B / LM431C Rev. 1.2.0 www.fairchildsemi.com 2 LM431A / LM431B / LM431C -- Programmable Shunt Regulator Block Diagram Values are at TA = 25C unless otherwise noted. Symbol Parameter VREF Conditions Reference VKA = VREF, Input Voltage IKA = 10 mA VREF/ T Deviation of Reference Input Voltage OverTemperature VREF/ VKA Ratio of Change in Reference Input Voltage IKA = 10 mA to the Change in Cathode Voltage LM431A LM431B LM431C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. 2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508 Unit V VKA = VREF, IKA =10 mA TMIN TA TMAX(1) 4.5 17.0 4.5 17.0 4.5 17.0 VKA = 10V-VREF -1.0 -2.7 -1.0 -2.7 -1.0 -2.7 VKA = 36V-10V -0.5 -2.0 -0.5 -2.0 -0.5 -2.0 Reference IKA = 10 mA, Input Current R1 =10 k, R2 = 1.5 4.0 1.5 4.0 1.5 4.0 A Deviation of Reference Input Current Over Full Temperature Range IKA = 10 mA, R1 = 10 k, R2 = TA = Full Range 0.4 1.2 0.4 1.2 0.4 1.2 A IKA(MIN) Minimum Cathode Cur-rent for Regulation VKA = VREF 0.45 1.00 0.45 1.00 0.45 1.00 mA IKA(OFF) Off - Stage Cathode Current VKA = 36 V, VREF = 0 0.05 1.00 0.05 1.00 0.05 1.00 A VKA = VREF, IKA =1 to 100 mA f 1.0 kHz 0.15 0.50 0.15 0.50 0.15 0.50 IREF IREF / T ZKA Dynamic Impedance mV mV / V Note: 1. LM431xC: TMIN = -25C, TMAX = +85C. LM431xI: TMIN = -40C, TMAX = +85C. (c) 2003 Fairchild Semiconductor Corporation LM431A / LM431B / LM431C Rev. 1.2.0 www.fairchildsemi.com 3 LM431A / LM431B / LM431C -- Programmable Shunt Regulator Electrical Characteristics LM431 LM431 Figure 3. Test Circuit for VKA VREF Figure 2. Test Circuit for VKA= VREF LM431 Figure 4. Test Circuit for IKA(OFF) (c) 2003 Fairchild Semiconductor Corporation LM431A / LM431B / LM431C Rev. 1.2.0 www.fairchildsemi.com 4 LM431A / LM431B / LM431C -- Programmable Shunt Regulator Test Circuits Figure 5. Cathode Current vs. Cathode Voltage Figure 6. Cathode Current vs. Cathode Voltage Figure 7. Change In Reference Input Voltage vs. Cathode Voltage Figure 8. Dynamic Impedance Frequency Figure 9. Small Signal Voltage Amplification vs. Frequency Figure 10. Pulse Response (c) 2003 Fairchild Semiconductor Corporation LM431A / LM431B / LM431C Rev. 1.2.0 www.fairchildsemi.com 5 LM431A / LM431B / LM431C -- Programmable Shunt Regulator Typical Performance Characteristics LM431A / LM431B / LM431C -- Programmable Shunt Regulator Typical Performance Characteristics (Continued) 140 A IK, CATHODE CURRENT(mA) 120 100 A VKA = Vref B VKA = 5.0 V @ IK = 10mA C VKA = 10 V @ IK = 10mA D VKA = 15 V @ IK = 10mA B C o TA = 25 C 80 60 40 D 20 0 100p 1n 10n 100n 1? 10? CL, LOAD CAPACITANCE Figure11. Stability Boundary Conditions (c) 2003 Fairchild Semiconductor Corporation LM431A / LM431B / LM431C Rev. 1.2.0 www.fairchildsemi.com 6 R 1 V O = V ref 1 + ------- R 2 R 1 V O = 1 + ------- V R ref 2 LM431 R 1 V O = 1 + ------- V R ref 2 LM431 LM431 Figure 12. Shunt Regulator Figure 13. Output Control for ThreeTerminal Fixed Regulator LM431 LM431 Figure 15. Current Limit or Current Source (c) 2003 Fairchild Semiconductor Corporation LM431A / LM431B / LM431C Rev. 1.2.0 Figure 14. High-Current Shunt Regulator Figure 16. Constant-Current Sink www.fairchildsemi.com 7 LM431A / LM431B / LM431C -- Programmable Shunt Regulator Typical Application LM431A / LM431B / LM431C -- Programmable Shunt Regulator Physical Dimensions TO-92 Bulk Type D D) DRAWING FILENAME: MKT-ZA03DREV3. Figure 17. 3-Lead, TO-92, Molded, Standard Straight Lead Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild's worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. (c) 2003 Fairchild Semiconductor Corporation LM431A / LM431B / LM431C Rev. 1.2.0 www.fairchildsemi.com 8 LM431A / LM431B / LM431C -- Programmable Shunt Regulator Physical Dimensions (Continued) TO-92 Ammo Type, Tape and Reel Type D D) DRAWING FILENAME: MKT-ZA03FREV2. Figure 18. 3-Lead, TO-92, Molded, 0.200 in Line Spacing Lead Form Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild's worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. For current tape and reel specifications, visit Fairchild Semiconductor's online packaging area: http://www.fairchildsemi.com/products/discrete/pdf/to92_tr.pdf. (c) 2003 Fairchild Semiconductor Corporation LM431A / LM431B / LM431C Rev. 1.2.0 www.fairchildsemi.com 9 LM431A / LM431B / LM431C -- Programmable Shunt Regulator Physical Dimensions (Continued) 8-SOIC 5.00 4.80 A 0.65 3.81 8 5 B 1.75 6.20 5.80 4.00 3.80 1 PIN ONE INDICATOR 5.60 4 1.27 (0.33) 1.27 0.25 C B A LAND PATTERN RECOMMENDATION SEE DETAIL A 0.25 0.10 0.25 0.19 C 1.75 MAX 0.10 0.51 0.33 OPTION A - BEVEL EDGE 0.50 x 45 0.25 R0.10 GAGE PLANE R0.10 OPTION B - NO BEVEL EDGE 0.36 NOTES: UNLESS OTHERWISE SPECIFIED 8 0 0.90 0.40 A) THIS PACKAGE CONFORMS TO JEDEC MS-012, VARIATION AA. B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS DO NOT INCLUDE MOLD FLASH OR BURRS. D) LANDPATTERN STANDARD: SOIC127P600X175-8M. E) DRAWING FILENAME: M08Arev14 F) FAIRCHILD SEMICONDUCTOR. SEATING PLANE (1.04) DETAIL A SCALE: 2:1 Figure 19. 8-Lead, SOIC, JEDEC MS 0-12, 0.150 inch Narrow Body Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild's worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor's online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. For current tape and reel specifications, visit Fairchild Semiconductor's online packaging area: http://www.fairchildsemi.com/products/discrete/pdf/soic8_tr.pdf. (c) 2003 Fairchild Semiconductor Corporation LM431A / LM431B / LM431C Rev. 1.2.0 www.fairchildsemi.com 10 TRADEMARKS The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidiaries, and is not intended to be an exhaustive list of all such trademarks. FPS F-PFS FRFET(R) SM Global Power Resource GreenBridge Green FPS Green FPS e-Series Gmax GTO IntelliMAX ISOPLANAR Making Small Speakers Sound Louder and BetterTM MegaBuck MICROCOUPLER MicroFET MicroPak MicroPak2 MillerDrive MotionMax mWSaver OptoHiT OPTOLOGIC(R) OPTOPLANAR(R) 2Cool AccuPower AX-CAP(R)* BitSiC Build it Now CorePLUS CorePOWER CROSSVOLT CTL Current Transfer Logic DEUXPEED(R) Dual CoolTM EcoSPARK(R) EfficientMax ESBC (R) Fairchild(R) Fairchild Semiconductor(R) FACT Quiet Series FACT(R) FAST(R) FastvCore FETBench Sync-LockTM (R) PowerTrench(R) PowerXSTM Programmable Active Droop QFET(R) QS Quiet Series RapidConfigure Saving our world, 1mW/W/kW at a timeTM SignalWise SmartMax SMART START Solutions for Your Success SPM(R) STEALTH SuperFET(R) SuperSOT-3 SuperSOT-6 SuperSOT-8 SupreMOS(R) SyncFET (R)* TinyBoost TinyBuck TinyCalc TinyLogic(R) TINYOPTO TinyPower TinyPWM TinyWire TranSiC TriFault Detect TRUECURRENT(R)* PSerDes UHC(R) Ultra FRFET UniFET VCX VisualMax VoltagePlus XSTM * Trademarks of System General Corporation, used under license by Fairchild Semiconductor. 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