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| July 2006 LM431SA/LM431SB/LM431SC Programmable Shunt Regulator Features Programmable Output Voltage to 36 Volts Low Dynamic Output Impedance 0.20 Typical Sink Current Capability of 1.0 to 100mA Equivalent Full-Range Temperature Coefficient of 50ppm/C Typical * Temperature Compensated for Operation Over Full Rated Operating Temperature Range * Low Output Noise Voltage * Fast Turn-on Response * * * * tm Description The LM431SA/LM431SB/LM431SC are three terminal output adjustable regulators with thermal stability over operating temperature range. The output voltage can be set any value between VREF (approximately 2.5 volts) and 36 volts 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 replacement for Zener Diodes in many applications. SOT-89 1 1. Ref 2. Anode 3. Cathode SOT-23F 3 1 2 1. Cathode 2. Ref 3. Anode Internal Block Diagram + - Rev. 1.0.5 (c)2006 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified.) Parameter Cathode Voltage Cathode current Range (Continuous) Reference Input Current Range Thermal Resistance Junction-Air (Note1,2) MF Suffix Package ML Suffix Package Power Dissipation (Note3,4) MF Suffix Package ML Suffix Package Junction Temperature Operating Temperature Range Storage Temperature Range Note: 1. Thermal resistance test board Symbol VKA IKA IREF RJA Value 37 -100 ~ +150 -0.05 ~ +10 350 220 350 560 150 -25 ~ +85 -65 ~ +150 Unit V mA mA C/W PD TJ TOPR TSTG mW C C C Size: 76.2mm * 114.3mm * 1.6mm (1S0P) JEDEC Standard: JESD51-3, JESD51-7 2. Assume no ambient airflow. 3. TJMAX = 150C, Ratings apply to ambient temperature at 25C 4. Power dissipation calculation: PD = (TJ - TA)/RJA Recommended Operating Conditions Parameter Cathode Voltage Cathode Current Symbol VKA IKA Min. VREF 1.0 Typ. Max. 36 100 Unit V mA 2 LM431SA/LM431SB/LM431SC Electrical Characteristics (TA = +25C, unless otherwise specified) Parameter Reference Input Voltage Deviation of Reference Input Voltage OverTemperature Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off -Stage Cathode Current Dynamic Impedance Symbol VREF Conditions VKA=VREF, IKA=10mA LM431SA LM431SB LM431SC 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 VREF/ T VKA=VREF, IKA=10mA TMINTATMAX - 4.5 17 - 4.5 17 - 4.5 17 mV VKA=10V- VREF/ VKA IKA =10mA VREF - -1.0 -2.7 - -1.0 -2.7 - -1.0 -2.7 mV/V VKA=36V10V IREF IKA=10mA, R1=10K,R2= - -0.5 -2.0 - -0.5 -2.0 - -0.5 -2.0 - 1.5 4 - 1.5 4 - 1.5 4 A IKA=10mA, R1=10K,R2= IREF/T TA =Full Range - 0.4 1.2 - 0.4 1.2 - 0.4 1.2 A IKA(MIN) VKA=VREF - 0.45 1.0 - 0.45 1.0 - 0.45 1.0 mA IKA(OFF) VKA=36V, VREF=0 VKA=VREF, IKA=1 to 100mA ,f 1.0kHz - 0.05 1.0 - 0.05 1.0 - 0.05 1.0 A ZKA - 0.15 0.5 - 0.15 0.5 - 0.15 0.5 Note1 TMIN = -25C, TMAX = +85C 3 LM431SA/LM431SB/LM431SC Test Circuits LM431S LM431S Figure 1. Test Circuit for VKA=VREF Figure 2. Test Circuit for VKAVREF LM431S Figure 3. Test Circuit for lKA(OFF) 4 LM431SA/LM431SB/LM431SC Typical Performance Characteristics 800 150 VKA = VREF TA = 25 C o VKA = VREF TA = 25 C o 600 100 IKA, CATHODE CURRENT (uA) IK, Cathode Current (mA) 400 50 IKA(MIN) 0 200 -50 0 -100 -2 -1 0 1 2 3 VKA, Cathode Voltage (V) -200 -1 0 1 VKA, CATHODE VOLTAGE (V) 2 3 Figure 4. Cathode Current vs. Cathode Voltage Figure 5. Cathode Current vs. Cathode Voltage 0.100 3.5 3.0 Ioff, Off-State Cathode Current (uA) 0.075 Iref, Reference Input Current (uA) -25 0 25 50 75 o 2.5 2.0 0.050 1.5 0.025 1.0 0.5 0.000 -50 100 125 0.0 -50 -25 0 25 50 75 o 100 125 TA, Ambient Temperature ( C) TA, Ambient Temperature ( C) Figure 6. OFF-State Cathode Current vs. Ambient Temperature 6 60 TA = 25 C IKA = 10mA o Figure7. Reference Input Current vs. Ambient Temperature TA=25 C o 50 5 INPUT 40 Open Loop Voltage Gain (dB) 4 Voltage Swing (V) 30 3 OUTPUT 20 2 10 1 0 -10 1k 10k 100k Frequency (Hz) 0 1M 10M 0 4 8 Time (us) 12 16 20 Figure 8. Small Signal Voltage Amplification vs. Frequency Figure 9. Pulse Response 5 LM431SA/LM431SB/LM431SC Typical Performance Characteristics (Continued) 140 120 A VKA = Vref B VKA = 5.0 V @ IK = 10mA TA = 25 C o 5 4 IK, CATHODE CURRENT(mA) 100 80 A stable 60 40 20 0 100p stable Current(mA) 1 10 3 2 B 1n 10n 100n 1 CL, LOAD CAPACITANCE 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Anode-Ref. Voltage(V) Figure 10. Stability Boundary Conditions 5 Figure 11. Anode-Reference Diode Curve 4 Current(mA) 3 2 1 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Ref.-Cathode Voltage(V) Figure 12. Reference-Cathode Diode Curve 6 LM431SA/LM431SB/LM431SC Typical Application R1 V O = 1 + ------ V ref R 2 R1 V O = V ref 1 + ------ R 2 R1 V O = 1 + ------ V ref R 2 LM7805/MC7805 LM431S LM431S LM431S Figure 13. Shunt Regulator - Figure 14. Output Control for Figure 15. High Current Shunt Regulator Three-Termianl Fixed Regulator LM431S LM431S Figure 16. Current Limit or Current Source Figure 17. Constant-Current Sink 7 LM431SA/LM431SB/LM431SC Mechanical Dimensions Package Dimensions in millimeters SOT-23F Marking 43A 43B 43C 2% tolerance 1% tolerance 0.5% tolerance 8 LM431SA/LM431SB/LM431SC Mechanical Dimensions (Continued) Package Dimensions in millimeters SOT-89 4.50 0.20 1.65 0.10 C0.2 (0.50) 1.50 0.20 (0.40) 2.50 0.20 0.50 0.10 1.50 TYP 1.50 TYP 0.40 0.10 (1.10) 4.10 0.20 0.40 +0.10 -0.05 Marking 43A 43B 43C 2% tolerance 1% tolerance 0.5% tolerance 9 LM431SA/LM431SB/LM431SC Ordering Information Product Number LM431SCCML LM431SCCMF LM431SBCML LM431SBCMF LM431SACML LM431SACMF Output Voltage Tolerance 0.5% 1% 2% Package SOT-89 SOT-23F SOT-89 SOT-23F SOT-89 SOT-23F -25 ~ +85C Operating Temperature 10 LM431SA/LM431SB/LM431SC TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. FACT Quiet SeriesTM GlobalOptoisolatorTM GTOTM HiSeCTM I2CTM i-LoTM ImpliedDisconnectTM IntelliMAXTM ISOPLANARTM LittleFETTM MICROCOUPLERTM MicroFETTM MicroPakTM MICROWIRETM MSXTM MSXProTM Across the board. Around the world.TM The Power Franchise(R) Programmable Active DroopTM ACExTM ActiveArrayTM BottomlessTM Build it NowTM CoolFETTM CROSSVOLTTM DOMETM EcoSPARKTM E2CMOSTM EnSignaTM FACTTM FAST(R) FASTrTM FPSTM FRFETTM OCXTM OCXProTM OPTOLOGIC(R) OPTOPLANARTM PACMANTM POPTM Power247TM PowerEdgeTM PowerSaverTM PowerTrench(R) QFET(R) QSTM QT OptoelectronicsTM Quiet SeriesTM RapidConfigureTM RapidConnectTM SerDesTM ScalarPumpTM SILENT SWITCHER(R) SMART STARTTM SPMTM StealthTM SuperFETTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8 SyncFETTM TCMTM TinyBoostTM TinyBuckTM TinyPWMTM TinyPowerTM TinyLogic(R) TINYOPTOTM TruTranslationTM UHCTM UltraFET(R) UniFETTM VCXTM WireTM DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD'S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. Preliminary First Production No Identification Needed Full Production Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only. Rev. I20 www.fairchildsemi.com 7/27/06 0.0m 001 Stock#DSxxxxxxxx (c) 2006 Fairchild Semiconductor Corporation |
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