LM431SA / LM431SB / LM431SC Programmable Shunt Regulator Features Description * * * * The LM431SA / LM431SB / LM431SC are three-terminal the output adjustable regulators with thermal stability over operating temperature range. The output voltage can be set 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 replacement for Zener diodes in many applications. Programmable Output Voltage to 36 V Low Dynamic Output Impedance: 0.2 (Typical) Sink Current Capability of 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 SOT-89 SOT-23F 3 1 1 2 1. Ref 2. Anode 3. Cathode 1. Cathode 2. Ref 3. Anode SOT-23 3 1 2 M32 - 1. Ref 2. Cathode 3. Anode M3 - 1. Cathode 2. Ref 3. Anode Ordering Information Product Number Output Voltage Operating Tolerance Temperature LM431SACMFX LM431SACM3X 2% Top Mark Package 43A SOT-23F 3L 43L SOT-23 3L LM431SACM32X 43G SOT-23 3L LM431SBCMLX 43B SOT-89 3L LM431SBCMFX LM431SBCM3X 1% -25 to +85C LM431SBCM32X 43B SOT-23F 3L 43M SOT-23 3L 43H SOT-23 3L LM431SCCMLX 43C SOT-89 3L LM431SCCMFX 43C SOT-23F 3L 43N SOT-23 3L LM431SCCM3X 0.5% LM431SCCM32X LM431SAIMFX (c) 2004 Fairchild Semiconductor Corporation LM431SA / LM431SB / LM431SC Rev. 1.3.2 2% -40 to +85C 43J SOT-23 3L 43AI SOT-23F 3L Packing Method Tape and Reel www.fairchildsemi.com 1 LM431SA / LM431SB / LM431SC -- Programmable Shunt Regulator August 2013 + - 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 VKA Cathode Voltage IKA Cathode current Range (Continuous) IREF Reference Input Current Range RJA Thermal Resistance Junction-Air (1,2) PD Power Dissipation (3,4) TJ Junction Temperature Operating Temperature Range TSTG Storage Temperature Range Unit 37 V -100 to +150 mA -0.05 to +10.00 mA ML Suffix Package (SOT-89) 220 MF Suffix Package (SOT-23F) 350 M32, M3 Suffix Package (SOT-23) 400 ML Suffix Package (SOT-89) 560 MF Suffix Package (SOT-23F) 350 M32, M3 Suffix Package (SOT-23) TOPR Value C/W mW 310 150 C All products except LM431SAIMFX -25 to +85 LM431SAIMFX -40 to +85 C C -65 to +150 Notes: 1. Thermal resistance test board Size: 1.6 mm x 76.2 mm x 114.3 mm (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 Symbol Parameter Min. Max. Unit VKA Cathode Voltage VREF 36 V IKA Cathode Current 1 100 mA (c) 2004 Fairchild Semiconductor Corporation LM431SA / LM431SB / LM431SC Rev. 1.3.2 www.fairchildsemi.com 2 LM431SA / LM431SB / LM431SC -- Programmable Shunt Regulator Block Diagram Values are at TA = 25C unless otherwise noted. Symbol Parameter VREF Reference Input Voltage VKA = VREF, IKA = 10 mA Deviation of Reference Input Voltage OverTemperature VKA = VREF, IKA = 10 mA TMIN TA TMAX VREF / T Conditions 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 SOT-89 SOT-23F 4.5 17.0 4.5 17.0 4.5 17.0 mV SOT-23 6.6 24 6.6 24 6.6 24 mV VKA = -1.0 -2.7 -1.0 -2.7 -1.0 -2.7 -0.5 -2.0 -0.5 -2.0 -0.5 -2.0 1.5 4.0 1.5 4.0 1.5 4.0 A SOT-89 SOT-23F 0.4 1.2 0.4 1.2 0.4 1.2 A SOT-23 0.8 2.0 0.8 2.0 0.8 2.0 A Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage IKA =10 mA Reference Input Current IKA = 10 mA, R1 = 10 K, R2 = Deviation of Reference Input Current Over Full Temperature Range IKA = 10 mA, R1 = 10 K, R2 = , TA = Full Range IKA(MIN) Minimum Cathode Current 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 ZKA Dynamic Impedance VKA = VREF, IKA = 1 to 100 mA, f 1.0 kHz 0.15 0.50 0.15 0.50 0.15 0.50 VREF / VKA IREF IREF / T 10 V-VREF mV/V VKA = 36 V-10 V Note: 5. TMIN = -25C, TMAX = +85C. (c) 2004 Fairchild Semiconductor Corporation LM431SA / LM431SB / LM431SC Rev. 1.3.2 www.fairchildsemi.com 3 LM431SA / LM431SB / LM431SC -- Programmable Shunt Regulator Electrical Characteristics Values are at TA = 25C unless otherwise noted. Symbol VREF VREF(dev) Parameter Conditions LM431SAI Min. Typ. Max. Unit Reference Input Voltage VKA = VREF, IKA = 10 mA 2.450 2.500 2.550 V Deviation of Reference Input Voltage OverTemperature VKA = VREF, IKA = 10 mA, TMIN TA TMAX 5 20 mV VKA = 10 V - VREF -1.0 -2.7 VKA = 36 V - 10 V -0.5 -2.0 VREF/VKA Ratio of Change in Reference Input Voltage to Change in Cathode Voltage IKA = 10 mA IREF Reference Input Current IKA = 10 mA, R1 =10 K, R2 = 1.5 4.0 A IREF(dev) Deviation of Reference Input Current Over Full Temperature Range IKA = 10 mA, R1 = 10 K, R2 = , TMIN TA TMAX 0.8 2.0 A IKA(MIN) Minimum Cathode Current for Regulation VKA = VREF 0.45 1.00 mA IKA(OFF) Off -Stage Cathode Current VKA = 36 V, VREF = 0 0.05 1.00 A ZKA Dynamic Impedance VKA = VREF, IKA = 1 to 100 mA, f 1.0 kHz 0.15 0.50 mV/V Notes: 6. TMIN = -40C, TMAX = +85C. 7. The deviation parameters VREF(dev) and IREF(dev)are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average full-range temperature coefficient of the reference input voltage, VREF, is defined as: V REF( dev ) 6 --------------------------------------- 10 V ( at25C ) REF ppm V REF ------------ = -----------------------------------------------------------TMAX - TMIN C VREF(min) VREF(dev) VREF(max) TMAX -TMIN where TMAX -TMIN is the rated operating free-air temperature range of the device. VREF can be positive or negative, depending on whether minimum VREF or maximum VREF, respectively, occurs at the lower temperature. Example: VREF(dev) = 4.5 mV, VREF = 2500 mV at 25 C, TMAX -TMIN = 125 C for LM431SAI. V REF 6 4.5mV - ---------------------- 10 2500mV = -------------------------------------------- = 14.4ppm C 125C Because minimum VREF occurs at the lower temperature, the coefficient is positive. (c) 2004 Fairchild Semiconductor Corporation LM431SA / LM431SB / LM431SC Rev. 1.3.2 www.fairchildsemi.com 4 LM431SA / LM431SB / LM431SC -- Programmable Shunt Regulator Electrical Characteristics(6, 7) (Continued) LM431S LM431S Figure 3. Test Circuit for VKA VREF Figure 2. Test Circuit for VKA = VREF LM431S Figure 4. Test Circuit for lKA(OFF) (c) 2004 Fairchild Semiconductor Corporation LM431SA / LM431SB / LM431SC Rev. 1.3.2 www.fairchildsemi.com 5 LM431SA / LM431SB / LM431SC -- Programmable Shunt Regulator Test Circuits 800 150 VKA = VREF VKA = VREF o TA = 25 C o TA = 25 C 600 IKA, CATHODE CURRENT (uA) IK, Cathode Current (mA) 100 50 0 IKA(MIN) 400 200 -50 0 -100 -2 -1 0 1 2 -200 3 -1 0 1 VKA, Cathode Voltage (V) 2 3 VKA, CATHODE VOLTAGE (V) Figure 6. Cathode Current vs. Cathode Voltage Figure 5. Cathode Current vs. Cathode Voltage 0.20 3.5 3.0 0.16 Iref, Reference Input Current (uA) Ioff, Off-State Cathode Current (uA) 0.18 0.14 0.12 0.10 0.08 0.06 0.04 2.5 2.0 1.5 1.0 0.5 0.02 0.00 -50 0.0 -50 -25 0 25 50 75 100 125 -25 0 25 50 150 75 100 125 o TA, Ambient Temperature ( C) o TA, Ambient Temperature ( C) Figure 7. OFF-State Cathode Current vs. Ambient Temperature Figure 8. Reference Input Current vs. Ambient Temperature 6 60 o TA = 25 C IKA = 10mA 50 o TA=25 C 5 INPUT 4 Voltage Swing (V) Open Loop Voltage Gain (dB) 40 30 20 3 OUTPUT 2 10 1 0 0 -10 1k 10k 100k 1M 0 10M Figure 9. Frequency vs. Small Signal Voltage Amplification (c) 2004 Fairchild Semiconductor Corporation LM431SA / LM431SB / LM431SC Rev. 1.3.2 4 8 12 16 20 Time (us) Frequency (Hz) Figure 10. Pulse Response www.fairchildsemi.com 6 LM431SA / LM431SB / LM431SC -- Programmable Shunt Regulator Typical Performance Characteristics 5 140 A VKA = Vref B VKA = 5.0 V @ IK = 10mA 120 4 o A 100 Current(mA) IK, CATHODE CURRENT(mA) TA = 25 C 80 stable stable 60 3 2 40 1 20 B 0 100p 1n 10n 1 100n 0 0.0 10 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Anode-Ref. Voltage(V) CL, LOAD CAPACITANCE Figure 11. Stability Boundary Conditions Figure 12. Anode-Reference Diode Curve 5 Current(mA) 4 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 13. Reference-Cathode Diode Curve (c) 2004 Fairchild Semiconductor Corporation LM431SA / LM431SB / LM431SC Rev. 1.3.2 Figure 14. Reference Input Voltage vs. Ambient Temperature www.fairchildsemi.com 7 LM431SA / LM431SB / LM431SC -- Programmable Shunt Regulator Typical Performance Characteristics (Continued) R1 V O = V ref 1 + ------- R2 R1 V O = 1 + ------- V ref R2 LM7805/MC7805 LM431S Figure 15. Shunt Regulator LM431S Figure 16. Output fir Three-Terminal Fixed Regulator R1 V O = 1 + ------- V ref R2 LM431S Figure 17. High Current Shunt Regulator LM431S LM431S Figure 18. Current Limit or Current Source (c) 2004 Fairchild Semiconductor Corporation LM431SA / LM431SB / LM431SC Rev. 1.3.2 Figure 19. Constant-Current Sink www.fairchildsemi.com 8 LM431SA / LM431SB / LM431SC -- Programmable Shunt Regulator Typical Application LM431SA / LM431SB / LM431SC -- Programmable Shunt Regulator Physical Dimensions SOT-89 & & $ 0,1 ; ; % &/ 6<00 & & 0,1 0,1 ; & 0 & $ % 0,1; & 0,1 0,1 /$1'3$77(51 5(&200(1'$7,21 6($7,1*3/$1( & & 127(681/(6627+(5:,6(63(&,),(' $5()(5(1&(72-('(&729$5,$7,21$$ %$//',0(16,216$5(,10,//,0(7(56 & '2(6127&203/<-('(&67$1'$5'9$/8( '',0(16,216$5((;&/86,9(2)%8556 02/')/$6+$1'7,(%$53527586,21 (',0(16,21$1'72/(5$1&($63(5$60( < )'5$:,1*),/(1$0(0$&5(9 Figure 20. 3-LEAD, SOT-89, JEDEC TO-243, OPTION AA (ACTIVE) 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/dwg/MA/MA03C.pdf. For current tape and reel specifications, visit Fairchild Semiconductor's online packaging area: http://www.fairchildsemi.com/packing_dwg/PKG-MA03C_JCET.pdf. (c) 2004 Fairchild Semiconductor Corporation LM431SA / LM431SB / LM431SC Rev. 1.3.2 www.fairchildsemi.com 9 LM431SA / LM431SB / LM431SC -- Programmable Shunt Regulator Physical Dimensions SOT-23F Figure 21. 3-LEAD, SOT-23, FLAT LEAD, LOW PROFILE (ACTIVE) 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/dwg/MA/MA03E.pdf. For current tape and reel specifications, visit Fairchild Semiconductor's online packaging area: http://www.fairchildsemi.com/packing_dwg/PKG-MA03E.pdf. (c) 2004 Fairchild Semiconductor Corporation LM431SA / LM431SB / LM431SC Rev. 1.3.2 www.fairchildsemi.com 10 LM431SA / LM431SB / LM431SC -- Programmable Shunt Regulator Physical Dimensions SOT-23 0.95 2.920.20 3 1.40 1.30+0.20 -0.15 1 2.20 2 0.60 0.37 (0.29) 0.95 0.20 1.00 A B 1.90 1.90 LAND PATTERN RECOMMENDATION SEE DETAIL A 1.20 MAX 0.10 0.00 (0.93) 0.10 C C 2.400.30 NOTES: UNLESS OTHERWISE SPECIFIED GAGE PLANE 0.23 0.08 0.25 0.20 MIN (0.55) SEATING PLANE A) REFERENCE JEDEC REGISTRATION TO-236, VARIATION AB, ISSUE H. B) ALL DIMENSIONS ARE IN MILLIMETERS. C) DIMENSIONS ARE INCLUSIVE OF BURRS, MOLD FLASH AND TIE BAR EXTRUSIONS. D) DIMENSIONING AND TOLERANCING PER ASME Y14.5M - 1994. E) DRAWING FILE NAME: MA03DREV10 SCALE: 2X Figure 22. 3-LEAD, SOT-23, JEDEC TO-236, LOW PROFILE (ACTIVE) 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/dwg/MA/MA03D.pdf. For current tape and reel specifications, visit Fairchild Semiconductor's online packaging area: http://www.fairchildsemi.com/packing_dwg/PKG-MA03D_JCET.pdf. 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