LM431SA/LM431SB/LM431SC Programmable Shunt Regulator Features 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. Programmable Output Voltage to 36 Volts Low Dynamic Output Impedance 0.2 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 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 Internal Block Diagram + - (c) 2012 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Rev. 1.2.0 www.fairchildsemi.com 1 LM431SA/LM431SB/LM431SC -- Programmable Shunt Regulator June 2012 (Operating temperature range applies unless otherwise specified.) Parameter Symbol Value Unit Cathode Voltage VKA 37 V Cathode current Range (Continuous) IKA -100 ~ +150 mA Reference Input Current Range IREF -0.05 ~ +10 mA Thermal Resistance Junction-Air (Note1,2) ML Suffix Package (SOT-89) MF Suffix Package (SOT-23F) M32, M3 Suffix Package (SOT-23) RJA 220 350 400 C/W Power Dissipation (Note3,4) ML Suffix Package (SOT-89) MF Suffix Package (SOT-23F) M32, M3 Suffix Package (SOT-23) PD Junction Temperature TJ 150 C Operating Temperature Range TOPR -25 ~ +85 C Storage Temperature Range TSTG -65 ~ +150 C 560 350 310 mW Note: 1. Thermal resistance test board 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 Symbol Min. Typ. Cathode Voltage VKA VREF - 36 V Cathode Current IKA 1.0 - 100 mA (c) 2012 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Rev. 1.2.0 Max. Unit www.fairchildsemi.com 2 LM431SA/LM431SB/LM431SC -- Programmable Shunt Regulator Absolute Maximum Ratings (TA = +25C, unless otherwise specified) Parameter Symbol Reference Input Voltage VREF Deviation of Reference Input Voltage OverTemperature VREF/T VKA=VREF, IKA=10mA SOT-89 VKA=VREF, SOT-23F IKA=10mA TMINTATMAX SOT-23 VKA=10V -VREF Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage VREF/ VKA Reference Input Current IREF Deviation of Reference Input Current Over Full Temperature Range Conditions IKA =10mA VKA=36V -10V IREF/T IKA=10mA, R1=10K,R2= 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 - 4.5 17 - 4.5 17 - 4.5 17 mV - 6.6 24 - 6.6 24 - 6.6 24 mV - -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 - 1.5 4 - 1.5 4 A mV/V SOT-89 SOT-23F IKA=10mA, R1=10K, R2=, TA =Full Range SOT-23 - 0.4 1.2 - 0.4 1.2 - 0.4 1.2 A - 0.8 2.0 - 0.8 2.0 - 0.8 2.0 A Minimum Cathode Current for Regulation IKA(MIN) VKA=VREF - 0.45 1.0 - 0.45 1.0 - 0.45 1.0 mA Off -Stage Cathode Current IKA(OFF) VKA=36V, VREF=0 - 0.05 1.0 - 0.05 1.0 - 0.05 1.0 A Dynamic Impedance ZKA VKA=VREF, IKA=1 to 100mA , f 1.0kHz - 0.15 0.5 - 0.15 0.5 - 0.15 0.5 Note1 TMIN = -25C, TMAX = +85C (c) 2012 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Rev. 1.2.0 www.fairchildsemi.com 3 LM431SA/LM431SB/LM431SC -- Programmable Shunt Regulator Electrical Characteristics LM431S LM431S Figure 2. Test Circuit for VKAVREF Figure 1. Test Circuit for VKA=VREF LM431S Figure 3. Test Circuit for lKA(OFF) (c) 2012 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Rev. 1.2.0 www.fairchildsemi.com 4 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 4. 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 6. OFF-State Cathode Current vs. Ambient Temperature Figure 7. 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 8. Small Signal Voltage Amplification vs. Frequency 8 12 16 20 Figure 9. Pulse Response (c) 2012 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Rev. 1.2.0 4 Time (us) Frequency (Hz) www.fairchildsemi.com 5 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 10. Stability Boundary Conditions Figure 11. 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 12. Reference-Cathode Diode Curve (c) 2012 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Rev. 1.2.0 www.fairchildsemi.com 6 LM431SA/LM431SB/LM431SC -- Programmable Shunt Regulator Typical Performance Characteristics (Continued) LM431SA/LM431SB/LM431SC -- Programmable Shunt Regulator Typical Application R1 V O = V ref 1 + ------- R 2 R1 V O = 1 + ------- V ref R 2 LM7805/MC7805 LM431S LM431S Figure 14. Output Control for Three-Terminal Fixed Regulator Figure 13. Shunt Regulator R1 V O = 1 + ------- V ref R2 LM431S Figure 15. High Current Shunt Regulator LM431S LM431S Figure 16. Current Limit or Current Source Figure 17. Constant-Current Sink (c) 2012 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Rev. 1.2.0 www.fairchildsemi.com 7 Package Dimensions in millimeters SOT-89 & & $ % &/ 6<00 & & 0,1 ; ; 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 Marking 43A 2% tolerance 43B 43C 1% tolerance 0.5% tolerance (c) 2012 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Rev. 1.2.0 www.fairchildsemi.com 8 LM431SA/LM431SB/LM431SC -- Programmable Shunt Regulator Mechanical Dimensions Package Dimensions in millimeters SOT-23F Marking 43A 43B 2% tolerance 1% tolerance (c) 2012 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Rev. 1.2.0 43C 0.5% tolerance www.fairchildsemi.com 9 LM431SA/LM431SB/LM431SC -- Programmable Shunt Regulator Mechanical Dimensions (Continued) Package Dimensions in millimeters SOT-23 Marking 43G 43H 2% tolerance 1% tolerance 43L 43M 2% tolerance 1% tolerance M32 - M3 - (c) 2012 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Rev. 1.2.0 43J 0.5% tolerance 43N 0.5% tolerance www.fairchildsemi.com 10 LM431SA/LM431SB/LM431SC -- Programmable Shunt Regulator Mechanical Dimensions (Continued) Product Number Output Voltage Tolerance Operating Temperature Package Packing Method LM431SCCMLX LM431SCCMFX LM431SCCM32X SOT-89 SOT-23F 0.5% SOT-23 LM431SCCM3X SOT-23 LM431SBCMLX SOT-89 LM431SBCMFX LM431SBCM32X 1% -25 ~ +85C SOT-23F SOT-23 LM431SBCM3X SOT-23 LM431SACMLX SOT-89 LM431SACMFX LM431SACM32X Tape and Reel SOT-23F 2% SOT-23 LM431SACM3X SOT-23 Note : X suffix means " Tape and Reel " packing. (c) 2012 Fairchild Semiconductor Corporation LM431SA/LM431SB/LM431SC Rev. 1.2.0 www.fairchildsemi.com 11 LM431SA/LM431SB/LM431SC -- Programmable Shunt Regulator Ordering Information 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. 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