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| www.fairchildsemi.com LM431A/LM431B/LM431C 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 Description The LM431A/LM431B/LM431C 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. TO-92 1 1. Ref 2. Anode 3. Cathode 8-DIP 8-SOP 1 1 1.Cathode 2.3.4.5.7.NC 6.Anode 8.Ref 1.Cathode 2.3.6.7.Anode 4.5.NC 8.Ref Internal Block Diagram REFERENCE CATHODE 2.5 Vref ANODE CATHODE (K) REFERENCE (R) ANODE (A) Rev. 1.0.7 (c)2003 Fairchild Semiconductor Corporation LM431A/LM431B/LM431C Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified.) Parameter Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Power Dissipation M, Z Suffix Package N Suffix Package Operating Temperature Range LM431xC LM431xI Junction Temperature Storage Temperature Range TOPR TJ TSTG -25 ~ +85 -40 ~ +85 150 -65 ~ +150 C C C C Symbol VKA IKA IREF PD Value 37 -100 ~ +150 -0.05 ~ +10 770 1000 Unit V mA mA mW Recommended Operating Conditions Parameter Cathode Voltage Cathode Current Symbol VKA IKA Min VREF 1.0 Typ Max 36 100 Unit V mA 2 LM431A/LM431B/LM431C 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 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 VREF/ T VKA=VREF, IKA=10mA TMINTATMAX - 4.5 17 - 4.5 17 - 4.5 17 mV VKA=10VVREF - -1.0 -2.7 - -1.0 -2.7 - -1.0 -2.7 mV/V VREF/ VKA IKA =10mA VKA=36V10V - -0.5 -2.0 - -0.5 -2.0 - -0.5 -2.0 IREF IKA=10mA, R1=10k,R2= - 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 * LM431XC : TMIN = -25 C, TMAX = +85C * LM431XI : TMIN = -40C, TMAX = +85C 3 LM431A/LM431B/LM431C Test Circuits LM431A/B/C LM431A/B/C Figure 1. Test Circuit for VKA=VREF Figure 2. Test Circuit for VKAVREF LM431A/B/C Figure 3. Test Circuit for lKA(OFF) 4 LM431A/LM431B/LM431C Typical Performance Characteristics Figure 4. Cathode Current vs. Cathode Voltage Figure 5. Cathode Current vs. Cathode Voltage Figure 6. Change In Reference Input Voltage vs. Cathode Voltage Figure7. Dynamic Impedance Frequency Figure 8. Small Signal Voltage Amplification vs. Frequency Figure 9. Pulse Response 5 LM431A/LM431B/LM431C Typical Performance Characteristics (Continued) 140 A 120 A VKA = Vref B VKA = 5.0 V @ IK = 10mA C VKA = 10 V @ IK = 10mA D VKA = 15 V @ IK = 10mA TA = 25 C 80 o B C IK, CATHODE CURRENT(mA) 100 60 40 20 D 0 100p 1n 10n 100n 1! 10! CL, LOAD CAPACITANCE Figure 10. Stability Boundary Conditions 6 LM431A/LM431B/LM431C 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 LM431A/B/C LM431A/B/C LM431A/B/C Figure 11. Shunt Regulator Figure 12. Output Control for Three--Te r- minal Fixed Regulator Figure 13. High Current Shunt Regulator LM431A/B/C LM431A/B/C Figure 14. Current Limit or Current Source Figure 15. Constant-Current Sink 7 LM431A/LM431B/LM431C Mechanical Dimensions Package Dimensions in millimeters TO-92 4.58 -0.15 +0.25 14.47 0.40 0.46 0.10 4.58 0.20 1.27TYP [1.27 0.20] 3.60 0.20 1.27TYP [1.27 0.20] 0.38 -0.05 +0.10 3.86MAX 1.02 0.10 0.38 -0.05 +0.10 (R2.29) 8 (0.25) LM431A/LM431B/LM431C Mechanical Dimensions (Continued) Package Dimensions in millimeters 8-SOP MIN 1.55 0.20 0.061 0.008 0.1~0.25 0.004~0.001 #1 #8 4.92 0.20 0.194 0.008 5.13 MAX 0.202 ( 0.56 ) 0.022 #4 #5 6.00 0.30 0.236 0.012 +0.10 0.15 -0.05 +0.004 0.006 -0.002 1.80 MAX 0.071 MAX0.10 MAX0.004 3.95 0.20 0.156 0.008 5.72 0.225 0.50 0.20 0.020 0.008 0~ 8 1.27 0.050 0.41 0.10 0.016 0.004 9 LM431A/LM431B/LM431C Mechanical Dimensions (Continued) Package Dimensions in millimeters 8-DIP 0.018 0.004 1.524 0.10 0.060 0.004 0.46 0.10 6.40 0.20 0.252 0.008 #1 #8 9.20 0.20 0.362 0.008 9.60 MAX 0.378 #4 #5 2.54 0.100 ( 0.79 ) 0.031 5.08 MAX 0.200 7.62 0.300 3.40 0.20 0.134 0.008 3.30 0.30 0.130 0.012 0.33 0.013 MIN 0.25 -0.05 0~15 +0.10 0.010 -0.002 +0.004 10 LM431A/LM431B/LM431C Ordering Information Product Number LM431CCZ LM431CCM LM431BCZ LM431BCM LM431ACN LM431ACZ LM431ACM LM431CIZ LM431CIM LM431BIZ LM431BIM LM431AIZ LM431AIM 0.5% 1% 2% 2% Output Voltage Tolerance 0.5% 1% Package TO-92 8-SOP TO-92 8-SOP 8-DIP TO-92 8-SOP TO-92 8-SOP TO-92 8-SOP TO-92 8-SOP -40 ~ +85C -25 ~ +85C Operating Temperature 11 LM431A/LM431B/LM431C 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. 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 THE PRESIDENT 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, and (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 a significant injury of the user. www.fairchildsemi.com 8/4/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation 2. A critical component in 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. |
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