LM431_05 NSC | Alldatasheet
Document overview
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Technical content
Features
n Average temperature coefficient 50 ppm/˚C n Temperature compensated for operation over the full temperature range n Programmable output voltage n Fast turn-on response n Low output noise n LM431 in micro SMD package n See AN-1112 for micro SMD considerations Connection Diagrams TO-92: Plastic Package 01005501 Top View SO-8: 8-Pin Surface Mount 01005502 Top view SOT-23: 3-Lead Small Outline 01005528 Top View 4-Bump micro SMD 01005554 Top View (bump side down) Note: *NC = Not internally connected. Must be electrically isolated from the rest of the circuit for the microSMD package. March 2005 LM431 Adjustable Precision Zener Shunt Regulator © 2005 National Semiconductor Corporation DS010055 www.national.com
Ordering Information
Package Typical Accuracy Order Number/Package Marking Temperature Range Transport Media NSC Drawing 0.5% 1% 2% TO-92 LM431CCZ/ LM431CCZ LM431BCZ/ LM431BCZ LM431ACZ/ LM431ACZ 0˚C to +70˚C Rails Z03ALM431CIZ/ LM431CIZ LM431BIZ/ LM431BIZ LM431AIZ/ LM431AIZ −40˚C to +85˚C SO-8 LM431CCM/ 431CCM LM431BCM/ 431BCM LM431ACM/ LM431ACM 0˚C to +70˚C Rails M08A LM431CCMX/ 431CCM LM431BCMX/ 431BCM LM431ACMX/ LM431ACM Tape & Reel LM431CIM/ 431CIM LM431BIM/ 431BIM LM431AIM/ LM431AIM −40˚C to +85˚C Rails LM431CIMX/ 431CIM LM431BIMX/ 431BIM LM431AIMX/ LM431AIM Tape &Reel SOT-23 LM431CCM3/ N1B LM431BCM3/ N1D LM431ACM3/ N1F 0˚C to +70˚C Rails MF03A LM431CCM3X/ N1B LM431BCM3X/ N1D LM431ACM3X/ N1F Tape & Reel LM431CIM3 N1A LM431BIM3 N1C LM431AIM3 N1E −40˚C to +85˚C Rails LM431CIM3X N1A LM431BIM3X N1C LM431AIM3X N1E Tape &Reel micro SMD LM431AIBP LM431AIBPX (Note 1) −40˚C to +85˚C
250 Units Tape and
Note 1: The micro SMD package marking i s a 1 digit manufacturing Date Code only micro SMD Top View Marking Example 01005556 LM431 www.national.com 2
Absolute Maximum Ratings(Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range −65˚C to +150˚C Operating Temperature Range Industrial (LM431xI) −40˚C to +85˚C Commercial (LM431xC) 0˚C to +70˚C Soldering Information Infrared or Convection (20 sec.) 235˚C Wave Soldering (10 sec.) 260˚C (lead temp.) Cathode Voltage 37V Continuous Cathode Current −10 mA to +150 mA Reference Voltage −0.5V Reference Input Current 10 mA Internal Power Dissipation (Notes 3, 0.78W 0.81W 0.28W micro SMD Package 0.30W Operating Conditions Min Max Cathode Voltage V REF 37V Cathode Current 1.0 mA 100 mA LM431
Electrical Characteristics
TA = 25˚C unless otherwise specified Symbol Parameter Conditions Min Typ Max Units VREF Reference Voltage V Z =V REF,I I = 10 mA 2.440 2.495 2.550 V LM431A (Figure 1) VZ =V REF,I I = 10 mA 2.470 2.495 2.520 V LM431B (Figure 1) VZ =V REF,I I = 10 mA 2.485 2.500 2.510 V LM431C (Figure 1) VDEV Deviation of Reference Input Voltage Over V Z =V REF,I I = 10 mA, 8.0 17 mV Temperature (Note 5) T A = Full Range (Figure 1) Ratio of the Change in Reference Voltage I Z =1 0m A V Z from VREF to 10V −1.4 −2.7 mV/V to the Change in Cathode Voltage (Figure 2)V Z from 10V to 36V −1.0 −2.0 IREF Reference Input Current R 1 =1 0k Ω,R 2 = ∞, 2.0 4.0 µA II =1 0m A (Figure 2) ∝IREF Deviation of Reference Input Current over R 1 =1 0k Ω,R 2 = ∞, Temperature I I = 10 mA, 0.4 1.2 µA TA = Full Range (Figure 2) IZ(MIN) Minimum Cathode Current for Regulation V Z =V REF (Figure 1) 0.4 1.0 mA IZ(OFF) Off-State Current V Z = 36V, VREF =0 V (Figure *NO TARGET FOR fi*) 0.3 1.0 µA rZ Dynamic Output Impedance (Note 6) V Z =V REF, LM431A, 0.75 Ω Frequency=0H z (Figure 1) VZ =V REF, LM431B, LM431C 0.50 Ω Frequency=0H z (Figure 1) Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 3: TJ Max = 150˚C. Note 4: Ratings apply to ambient temperature at 25˚C. Above this temperature, derate the TO-92 at 6.2 mW/˚C, the SO-8 at 6.5 mW/˚C, the SOT-23 at 2.2 mW/˚C and the micro SMD at 3mW/˚C. Note 5: Deviation of reference input voltage, V DEV, is defined as the maximum variation of the reference input voltage over the full temperature range. LM431 www.national.com 4
Electrical Characteristics (Continued) 01005507 The average temperature coefficient of the reference input voltage, ∝VREF, is defined as: Where: T2 −T 1 = full temperature change (0-70˚C). ∝VREF can be positive or negative depending on whether the slope is positive or negative. Example: VDEV = 8.0 mV, VREF = 2495 mV, T2 −T 1 = 70˚C, slope is positive. Note 6: The dynamic output impedance, r Z, is defined as: When the device is programmed with two external resistors, R1 and R2, (see Figure 2), the dynamic output impedance of the overall circuit, r Z, is defined as: LM431 www.national.com5
Typical Performance Characteristics Input Current vs VZ Thermal Information 01005529 01005530 Input Current vs VZ Dynamic Impedance vs Frequency 01005531 01005509 LM431 www.national.com 6
Typical Performance Characteristics (Continued) Stability Boundary Conditions 01005511 Note: The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V + were adjusted to establish the initial V Z and IZ conditions with CL =0 .V + and CL were then adjusted to determine the ranges of stability. 01005510 Test Circuit for Curve A Above Test Circuit for Curves B, C and D Above 01005512 01005513 Typical Applications Shunt Regulator 01005514 Single Supply Comparator with Temperature Compensated Threshold 01005515 LM431 www.national.com7
Typical Applications (Continued) Series Regulator 01005516 Output Control of a Three Terminal Fixed Regulator 01005517 Higher Current Shunt Regulator 01005518 Crow Bar 01005519 LM431 www.national.com 8
Typical Applications (Continued) Over Voltage/Under Voltage Protection Circuit 01005520 Voltage Monitor 01005521 LM431 www.national.com9
Typical Applications (Continued) Delay Timer 01005522 Current Limiter or Current Source 01005523 Constant Current Sink 01005524 Application Info
1.0 Mounting
To ensure that the geometry of the micro SMD package maintains good physical contact with the printed circuit board, pin A1 (NC) must be soldered to the pcb. Please see AN-1112 for more detailed information regarding board mounting techniques for the micro SMD package.
2.0 LM431 micro SMD Light Sensitivity
When the LM431 micro SMD package is exposed to bright sunlight, normal office fluorescent light, and other LED’s and lasers, it operates within the guaranteed limits specified in the electrical characteristics table. LM431 www.national.com 10
Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin SOIC SOT-23 Molded Small Outline Transistor Package (M3) LM431 www.national.com11
Physical Dimensions inches (millimeters) unless otherwise noted (Continued) LM431 www.national.com 12
Physical Dimensions inches (millimeters) unless otherwise noted (Continued) NOTES: UNLESS OTHERWISE SPECIFIED 1. EPOXY COATING 2. 63Sn/37Pb EUTECTIC BUMP 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED. 5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS PACKAGE HEIGHT. 6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BA. 4-Bump micro SMD X1 = 0.777 X2 = 0.904 X3 = 0.850 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL 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 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 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. BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 www.national.com LM431 Adjustable Precision Zener Shunt Regulator