LM4040 LM4040 Precision Micropower Shunt Voltage Reference Literature Number: SNOS633E LM4040 Precision Micropower Shunt Voltage Reference General Description Features Ideal for space critical applications, the LM4040 precision voltage reference is available in the sub-miniature SC70 and SOT-23 surface-mount package. The LM4040's advanced design eliminates the need for an external stabilizing capacitor while ensuring stability with any capacitive load, thus making the LM4040 easy to use. Further reducing design effort is the availability of several fixed reverse breakdown voltages: 2.048V, 2.500V, 3.000V, 4.096V, 5.000V, 8.192V, and 10.000V. The minimum operating current increases from 60 A for the LM4040-2.5 to 100 A for the LM4040-10.0. All versions have a maximum operating current of 15 mA. The LM4040 utilizes fuse and zener-zap reverse breakdown voltage trim during wafer sort to ensure that the prime parts have an accuracy of better than 0.1% (A grade) at 25C. Bandgap reference temperature drift curvature correction and low dynamic impedance ensure stable reverse breakdown voltage accuracy over a wide range of operating temperatures and currents. Also available is the LM4041 with two reverse breakdown voltage versions: adjustable and 1.2V. Please see the LM4041 data sheet. Small packages: SOT-23, TO-92 and SC70 No output capacitor required Tolerates capacitive loads Fixed reverse breakdown voltages of 2.048V, 2.500V, 3.000V, 4.096V, 5.000V, 8.192V, and 10.000V Key Specifications (LM4040-2.5) Output voltage tolerance 0.1% (max) (A grade, 25C) Low output noise 35 Vrms(typ) (10 Hz to 10 kHz) Wide operating current range 60 A to 15 mA Industrial temperature range -40C to +85C Extended temperature range -40C to +125C Low temperature coefficient 100 ppm/C (max) Applications Portable, Battery-Powered Equipment Data Acquisition Systems Instrumentation Process Control Energy Management Product Testing Automotive Precision Audio Components Connection Diagrams SOT-23 TO-92 SC70 1132301 *This pin must be left floating or connected to pin 2. Top View See NS Package Number MF03A (JEDEC Registration TO-236AB) (c) 2010 National Semiconductor Corporation 1132303 Bottom View See NS Package Number Z03A 11323 1132330 *This pin must be left floating or connected to pin 1. Top View See NS Package Number MAA05A www.national.com LM4040 Precision Micropower Shunt Voltage Reference December 9, 2010 LM4040 Ordering Information Industrial Temperature Range (-40C to +85C) Reverse Breakdown M3 (SOT-23) Voltage Tolerance at 25C and Average Supplied as 1000 Supplied as 3000 Reverse Units Tape and Units tape and Breakdown Reel Reel Voltage Temperature Coefficient Package M7 (SC70) Supplied as 1000 Units Tape and Reel Supplied as 3000 Units Tape and Reel Z (TO-92) 0.1%, 100 ppm/ LM4040AIM3-2.0 C max (A grade) LM4040AIM3-2.5 LM4040AIM3-3.0 LM4040AIM3-4.1 LM4040AIM3-5.0 LM4040AIM3-8.2 LM4040AIM3-10.0 LM4040AIM3X-2.0 LM4040AIM3X-2.5 LM4040AIM3X-3.0 LM4040AIM3X-4.1 LM4040AIM3X-5.0 LM4040AIM3X-8.2 LM4040AIM3X-10. 0 0.2%, 100 ppm/ LM4040BIM3-2.0 C max (B grade) LM4040BIM3-2.5 LM4040BIM3-3.0 LM4040BIM3-4.1 LM4040BIM3-5.0 LM4040BIM3-8.2 LM4040BIM3-10.0 LM4040BIM3X-2.0 LM4040BIM3X-2.5 LM4040BIM3X-3.0 LM4040BIM3X-4.1 LM4040BIM3X-5.0 LM4040BIM3X-8.2 LM4040BIM3X-10. 0 LM4040BIM7-2.0 LM4040BIM7-2.5 LM4040BIM7-3.0 LM4040BIM7-4.1 LM4040BIM7-5.0 LM4040BIM7X-2.0 LM4040BIM7X-2.5 LM4040BIM7X-3.0 LM4040BIM7X-4.1 LM4040BIM7X-5.0 LM4040BIZ-2.0 MF03A, LM4040BIZ-2.5 Z03A, LM4040BIZ-3.0 MAA05A LM4040BIZ-4.1 LM4040BIZ-5.0 LM4040BIZ-8.2 LM4040BIZ-10.0 0.5%, 100 ppm/ LM4040CIM3-2.0 C max (C grade) LM4040CIM3-2.5 LM4040CIM3-3.0 LM4040CIM3-4.1 LM4040CIM3-5.0 LM4040CIM3-8.2 LM4040CIM3-10.0 LM4040CIM3X-2.0 LM4040CIM3X-2.5 LM4040CIM3X-3.0 LM4040CIM3X-4.1 LM4040CIM3X-5.0 LM4040CIM3X-8.2 LM4040CIM3X-10. 0 LM4040CIM7-2.0 LM4040CIM7-2.5 LM4040CIM7-3.0 LM4040CIM7-4.1 LM4040CIM7-5.0 LM4040CIM7X-2.0 LM4040CIM7X-2.5 LM4040CIM7X-3.0 LM4040CIM7X-4.1 LM4040CIM7X-5.0 LM4040CIZ-2.0 MF03A, LM4040CIZ-2.5 Z03A, LM4040CIZ-3.0 MAA05A LM4040CIZ-4.1 LM4040CIZ-5.0 LM4040CIZ-8.2 LM4040CIZ-10.0 1.0%, 150 ppm/ LM4040DIM3-2.0 C max (D grade) LM4040DIM3-2.5 LM4040DIM3-3.0 LM4040DIM3-4.1 LM4040DIM3-5.0 LM4040DIM3-8.2 LM4040DIM3-10.0 LM4040DIM3X-2.0 LM4040DIM3X-2.5 LM4040DIM3X-3.0 LM4040DIM3X-4.1 LM4040DIM3X-5.0 LM4040DIM3X-8.2 LM4040DIM3X-10. 0 LM4040DIM7-2.0 LM4040DIM7-2.5 LM4040DIM7-3.0 LM4040DIM7-4.1 LM4040DIM7-5.0 LM4040DIM7X-2.0 LM4040DIM7X-2.5 LM4040DIM7X-3.0 LM4040DIM7X-4.1 LM4040DIM7X-5.0 LM4040DIZ-2.0 MF03A, LM4040DIZ-2.5 Z03A, LM4040DIZ-3.0 MAA05A LM4040DIZ-4.1 LM4040DIZ-5.0 LM4040DIZ-8.2 LM4040DIZ-10.0 2.0%, 150 ppm/ LM4040EIM3-2.0 C max (E grade) LM4040EIM3-2.5 LM4040EIM3-3.0 LM4040EIM3X-2.0 LM4040EIM3X-2.5 LM4040EIM3X-3.0 LM4040EIM7-2.0 LM4040EIM7-2.5 LM4040EIM7-3.0 LM4040EIM7X-2.0 LM4040EIZ-2.0 LM4040EIM7X-2.5 LM4040EIZ-2.5 LM4040EIM7X-3.0 LM4040EIZ-3.0 www.national.com LM4040AIZ-2.0 LM4040AIZ-2.5 LM4040AIZ-3.0 LM4040AIZ-4.1 LM4040AIZ-5.0 LM4040AIZ-8.2 LM4040AIZ-10.0 NS Package Number 2 MF03A, Z03A MF03A, Z03A, MAA05A LM4040 Extended Temperature Range (-40 C to +125C) Reverse Breakdown Voltage Tolerance at 25 C and Average Reverse Breakdown Voltage Temperature Coefficient Package M3 (SOT-23) See NS Package Number MF03A 0.5%, 100 ppm/C max (C grade) LM4040CEM3-2.0, LM4040CEM3-2.5, LM4040CEM3-3.0, LM4040CEM3-5.0 1.0%, 150 ppm/C max (D grade) LM4040DEM3-2.0, LM4040DEM3-2.5, LM4040DEM3-3.0, LM4040DEM3-5.0 2.0%, 150 ppm/C max (E grade) LM4040EEM3-2.0, LM4040EEM3-2.5, LM4040EEM3-3.0 3 www.national.com LM4040 SOT-23 AND SC70 Package Marking Information Only three fields of marking are possible on the SOT-23's and SC70's small surface. This table gives the meaning of the three fields. Part Marking RJA SOT-23 only R2A SOT-23 only RKA SOT-23 only R4A SOT-23 only R5A SOT-23 only R8A SOT-23 only R0A SOT-23 only RJB R2B RKB R4B R5B R8B SOT-23 only R0B SOT-23 only RJC R2C RKC R4C R5C R8C SOT-23 only R0C SOT-23 only Field Definition First Field: R = Reference Second Field: J = 2.048V Voltage Option 2 = 2.500V Voltage Option K = 3.000V Voltage Option 4 = 4.096V Voltage Option 5 = 5.000V Voltage Option 8= 8.192V Voltage Option 0 = 10.000V Voltage Option Third Field: A-E = Initial Reverse Breakdown Voltage or Reference Voltage Tolerance A = 0.1%, B = 0.2%, C = +0.5%, D = 1.0%, E = 2.0% RJD R2D RKD R4D R5D R8D SOT-23 only R0D SOT-23 only RJE R2E RKE www.national.com 4 If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Reverse Current Forward Current Power Dissipation (TA = 25C) (Note 2) M3 Package Z Package M7 Package Storage Temperature Lead Temperature M3 Package Vapor phase (60 seconds) Infrared (15 seconds) Z Package Soldering (10 seconds) ESD Susceptibility Human Body Model (Note 3) Operating Ratings 20 mA 10 mA (Note 1, Note 2) (Tmin TA Tmax) Temperature Range -40C TA +85C Industrial Temperature Range 306 mW 550 mW 241 mW -65C to +150C -40C TA +125C Extended Temperature Range +215C +220C +260C Reverse Current LM4040-2.0 60 A to 15 mA LM4040-2.5 60 A to 15 mA LM4040-3.0 62 A to 15 mA LM4040-4.1 68 A to 15 mA LM4040-5.0 74 A to 15 mA LM4040-8.2 91 A to 15 mA LM4040-10.0 100 A to 15 mA 2 kV LM4040-2.0 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A and B designate initial Reverse Breakdown Voltage tolerances of 0.1% and 0.2%, respectively. Symbol VR IRMIN VR/T Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage IR = 100 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 A Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient IR = 100 A (Note 6) eN IRMIN IR 1 mA 4.1 mV (max) 15 17 mV (max) 60 60 A (max) 65 65 A (max) A ppm/C 100 100 ppm/C 0.3 mV 0.8 1.0 2.5 IR = 100 A ppm/C (max) 15 0.8 1.0 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, IAC = 0.1 IR Wideband Noise 2.0 20 15 Units (Limit) V 45 1 mA IR 15 mA ZR LM4040BIM3 LM4040BIZ LM4040BIM7 (Limit) (Note 5) 2.048 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note ) LM4040AIM3 LM4040AIZ (Limit) (Note 5) mV 6.0 8.0 6.0 8.0 0.8 0.8 mV (max) mV (max) 0.3 35 mV (max) mV (max) (max) Vrms 10 Hz f 10 kHz 5 www.national.com LM4040 Machine Model (Note 3) 200V See AN-450 "Surface Mounting Methods and Their Effect on Product Reliability" for other methods of soldering surface mount devices. Absolute Maximum Ratings (Note 1) LM4040 Symbol VR VHYST Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage Long Term Stability t = 1000 hrs T = 25C 0.1C IR = 100 A Thermal Hysteresis (Note 8) T = -40C to +125C LM4040AIM3 LM4040AIZ (Limit) (Note 5) LM4040BIM3 LM4040BIZ LM4040BIM7 (Limit) (Note 5) Units (Limit) 120 ppm 0.08 % LM4040-2.0 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades C, D and E designate initial Reverse Breakdown Voltage tolerances of 0.5%, 1.0% and 2.0%, respectively. Symbol VR Parameter Conditions Reverse Breakdown IR = 100 A Voltage Typical (Note 4) 2.048 Reverse Breakdown IR = 100 A Voltage Tolerance (Note 6) IRMIN VR/T VR/IR ZR Minimum Operating Current Average Reverse Breakdown Voltage Temperature Coefficient (Note 6) LM4040CIM3 LM4040DIM3 LM4040EIM7 LM4040CIZ LM4040DIZ LM4040EIZ LM4040CIM7 LM4040DIM7 (Limit) (Limit) (Limit) (Note 5) (Note 5) (Note 5) Units (Limit) V 10 20 41 mV (max) 23 40 60 mV (max) 60 65 65 A (max) 65 70 70 A (max) 100 150 150 ppm/C (max) A 45 IR = 10 mA 20 IR = 1 mA 15 IR = 100 A 15 ppm/C 0.3 mV Reverse Breakdown IRMIN IR 1 mA Voltage Change with Operating Current Change 1 mA IR 15 mA (Note ) Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz eN Wideband Noise IR = 100 A VR Reverse Breakdown t = 1000 hrs Voltage Long Term T = 25C 0.1C Stability IR = 100 A ppm/C 0.8 1.0 1.0 1.2 1.0 1.2 mV (max) mV (max) 6.0 8.0 8.0 10.0 8.0 10.0 mV (max) mV (max) 0.9 1.1 1.1 (max) 2.5 mV 0.3 IAC = 0.1 IR 35 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz VHYST Thermal Hysteresis (Note 8) www.national.com T = -40C to +125C 6 Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades C, D and E designate initial Reverse Breakdown Voltage tolerances of 0.5%, 1.0% and 2.0%, respectively. Symbol VR Parameter Conditions Reverse Breakdown IR = 100 A Voltage Typical (Note 4) VR/T Minimum Operating Current Average Reverse Breakdown Voltage Temperature Coefficient (Note 6) Units (Limit) V 10 20 41 mV (max) 30 50 70 mV (max) 60 65 65 A (max) 68 73 73 A (max) A 45 IR = 10 mA 20 IR = 1 mA 15 IR = 100 A 15 ppm/C 0.3 mV VR/IR Reverse Breakdown IRMIN IR 1 mA Voltage Change with Operating Current Change (Note 7) 1 mA IR 15 mA ZR LM4040DEM LM4040EEM3 3 (Limit) (Limit) (Note 5) (Note 5) 2.048 Reverse Breakdown IR = 100 A Voltage Tolerance (Note 6) IRMIN LM4040CEM 3 (Limit) (Note 5) ppm/C 100 0.8 1.0 150 1.0 1.2 150 1.0 1.2 2.5 ppm/C (max) mV (max) mV (max) mV 6.0 8.0 8.0 10.0 8.0 10.0 mV (max) mV (max) 0.9 1.1 1.1 (max) Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, IAC = 0.1 IR 0.3 eN Wideband Noise IR = 100 A 35 Vrms VR Reverse Breakdown t = 1000 hrs Voltage Long Term T = 25C 0.1C Stability IR = 100 A 120 ppm 0.08 % 10 Hz f 10 kHz VHYST Thermal Hysteresis (Note 8) T = -40C to +125C 7 www.national.com LM4040 LM4040-2.0 Electrical Characteristics (Extended Temperature Range) LM4040 LM4040-2.5 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A and B designate initial Reverse Breakdown Voltage tolerances of 0.1% and 0.2%, respectively. Symbol VR IRMIN VR/T Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage IR = 100 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 A Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 A 2.5 5.0 mV (max) 19 21 mV (max) 60 60 A (max) 65 65 A (max) A 20 15 IRMIN IR 1 mA ppm/C 100 Wideband Noise VR Reverse Breakdown Voltage Long Term Stability t = 1000 hrs T = 25C 0.1C IR = 100 A Thermal Hysteresis (Note 8) T = -40C to +125C ppm/C (max) ppm/C 0.3 mV 0.8 1.0 2.5 IR = 100 A eN 100 15 0.8 1.0 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, IAC = 0.1 IR Units (Limit) V 45 1 mA IR 15 mA ZR LM4040BIM3 LM4040BIZ LM4040BIM7 Limits (Note 5) 2.500 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note 7) LM4040AIM3 LM4040AIZ (Limit) (Note 5) mV (max) mV (max) mV 6.0 8.0 6.0 8.0 0.8 0.8 mV (max) mV (max) 0.3 (max) 35 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz VHYST www.national.com 8 LM4040 LM4040-2.5 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades C, D and E designate initial Reverse Breakdown Voltage tolerances of 0.5%, 1.0% and 2.0%, respectively. Symbol VR Parameter Conditions Reverse Breakdown IR = 100 A Voltage Typical (Note 4) 2.500 Reverse Breakdown IR = 100 A Voltage Tolerance (Note 6) IRMIN VR/T VR/IR ZR Minimum Operating Current Average Reverse Breakdown Voltage Temperature Coefficient(Note 6) LM4040CIM3 LM4040DIM3 LM4040EIM7 LM4040CIZ LM4040DIZ LM4040EIZ LM4040CIM7 LM4040DIM7 Limits Limits Limits (Note 5) (Note 5) (Note 5) Units (Limit) V 12 25 50 mV (max) 29 49 74 mV (max) 60 65 65 A (max) 65 70 70 A (max) 100 150 150 ppm/C (max) A 45 IR = 10 mA 20 IR = 1 mA 15 IR = 100 A 15 ppm/C 0.3 mV Reverse Breakdown IRMIN IR 1 mA Voltage Change with Operating Current Change 1 mA IR 15 mA (Note 7) Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz eN Wideband Noise IR = 100 A VR Reverse Breakdown t = 1000 hrs Voltage Long Term T = 25C 0.1C Stability IR = 100 A ppm/C 0.8 1.0 1.0 1.2 1.0 1.2 2.5 mV (max) mV (max) mV 6.0 8.0 8.0 10.0 8.0 10.0 0.9 1.1 1.1 mV (max) mV (max) 0.3 IAC = 0.1 IR (max) 35 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz VHYST Thermal Hysteresis (Note 8) T = -40C to +125C 9 www.national.com LM4040 LM4040-2.5 Electrical Characteristics (Extended Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades C, D and E designate initial Reverse Breakdown Voltage tolerances of 0.5%, 1.0% and 2.0%, respectively. Symbol VR Parameter Conditions Reverse Breakdown IR = 100 A Voltage Typical (Note 4) VR/T Minimum Operating Current Average Reverse Breakdown Voltage Temperature Coefficient (Note 6) Units (Limit) V 12 25 50 mV (max) 38 63 88 mV (max) 60 65 65 A (max) 68 73 73 A (max) A 45 IR = 10 mA 20 IR = 1 mA 15 IR = 100 A 15 ppm/C 0.3 mV VR/IR Reverse Breakdown IRMIN IR 1 mA Voltage Change with Operating Current Change (Note 7) 1 mA IR 15 mA ZR LM4040DEM LM4040EEM3 3 Limits Limits (Note 5) (Note 5) 2.500 Reverse Breakdown IR = 100 A Voltage Tolerance (Note 6) IRMIN LM4040CEM 3 Limits (Note 5) ppm/C 100 150 150 ppm/C (max) 0.8 1.0 1.0 1.2 1.0 1.2 mV (max) mV (max) 6.0 8.0 8.0 10.0 8.0 10.0 mV (max) mV (max) 0.9 1.1 1.1 (max) 2.5 mV Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, IAC = 0.1 IR 0.3 eN Wideband Noise IR = 100 A 35 Vrms VR Reverse Breakdown t = 1000 hrs Voltage Long Term T = 25C 0.1C Stability IR = 100 A 120 ppm 0.08 % 10 Hz f 10 kHz VHYST Thermal Hysteresis (Note 8) www.national.com T = -40C to +125C 10 LM4040 LM4040-3.0 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A and B designate initial Reverse Breakdown Voltage tolerances of 0.1% and 0.2%, respectively. Symbol VR IRMIN VR/T Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage IR = 100 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 A Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 A 3.0 6.0 mV (max) 22 26 mV (max) 62 62 A (max) 67 67 A (max) A 20 15 IRMIN IR 1 mA ppm/C 100 Wideband Noise VR Reverse Breakdown Voltage Long Term Stability t = 1000 hrs T = 25C 0.1C IR = 100 A Thermal Hysteresis (Note 8) T = -40C to +125C ppm/C (max) ppm/C 0.6 mV 0.8 1.1 2.7 IR = 100 A eN 100 15 0.8 1.1 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, IAC = 0.1 IR Units (Limit) V 47 1 mA IR 15 mA ZR LM4040BIM3 LM4040BIZ LM4040BIM7 Limits (Note 5) 3.000 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note 7) LM4040AIM3 LM4040AIZ (Limit) (Note 5) mV (max) mV (max) mV 6.0 9.0 6.0 9.0 0.9 0.9 mV (max) mV (max) 0.4 (max) 35 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz VHYST 11 www.national.com LM4040 LM4040-3.0 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades C, D and E designate initial Reverse Breakdown Voltage tolerances of 0.5%, 1.0% and 2.0%, respectively. Symbol VR Parameter Conditions Reverse Breakdown IR = 100 A Voltage Typical (Note 4) 3.000 Reverse Breakdown IR = 100 A Voltage Tolerance (Note 6) IRMIN VR/T VR/IR ZR Minimum Operating Current Average Reverse Breakdown Voltage Temperature Coefficient(Note 6) LM4040CIM3 LM4040DIM3 LM4040EIM7 LM4040CIZ LM4040DIZ LM4040EIZ LM4040CIM7 LM4040DIM7 Limits Limits Limits (Note 5) (Note 5) (Note 5) Units (Limit) V 15 30 60 mV (max) 34 59 89 mV (max) 60 65 65 A (max) 65 70 70 A (max) 100 150 150 ppm/C (max) A 45 IR = 10 mA 20 IR = 1 mA 15 IR = 100 A 15 ppm/C 0.4 mV Reverse Breakdown IRMIN IR 1 mA Voltage Change with Operating Current Change 1 mA IR 15 mA (Note 7) Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz eN Wideband Noise IR = 100 A VR Reverse Breakdown t = 1000 hrs Voltage Long Term T = 25C 0.1C Stability IR = 100 A ppm/C 0.8 1.1 1.1 1.3 1.1 1.3 2.7 mV (max) mV (max) mV 6.0 9.0 8.0 11.0 8.0 11.0 0.9 1.2 1.2 mV (max) mV (max) 0.4 IAC = 0.1 IR (max) 35 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz VHYST Thermal Hysteresis (Note 8) www.national.com T = -40C to +125C 12 LM4040 LM4040-3.0 Electrical Characteristics (Extended Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades C, D and E designate initial Reverse Breakdown Voltage tolerances of 0.5%, 1.0% and 2.0%, respectively. Symbol VR Parameter Conditions Reverse Breakdown IR = 100 A Voltage Typical (Note 4) VR/T Minimum Operating Current Average Reverse Breakdown Voltage Temperature Coefficient (Note 6) Units (Limit) V 15 30 60 mV (max) 45 75 105 mV (max) 62 67 67 A (max) 70 75 75 A (max) A 47 IR = 10 mA 20 IR = 1 mA 15 IR = 100 A 15 ppm/C 0.4 mV VR/IR Reverse Breakdown IRMIN IR 1 mA Voltage Change with Operating Current Change (Note 7) 1 mA IR 15 mA ZR LM4040DEM LM4040EEM3 3 Limits Limits (Note 5) (Note 5) 3.000 Reverse Breakdown IR = 100 A Voltage Tolerance (Note 6) IRMIN LM4040CEM 3 Limits (Note 5) ppm/C 100 150 150 ppm/C (max) 0.8 1.1 1.1 1.3 1.1 1.3 mV (max) mV (max) 6.0 9.0 8.0 11.0 8.0 11.0 mV (max) mV (max) 0.9 1.2 1.2 (max) 2.7 mV Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, IAC = 0.1 IR 0.4 eN Wideband Noise IR = 100 A 35 Vrms VR Reverse Breakdown t = 1000 hrs Voltage Long Term T = 25C 0.1C Stability IR = 100 A 120 ppm 0.08 % 10 Hz f 10 kHz VHYST Thermal Hysteresis (Note 8) T = -40C to +125C 13 www.national.com LM4040 LM4040-4.1 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A and B designate initial Reverse Breakdown Voltage tolerances of 0.1% and 0.2%, respectively. Symbol VR IRMIN VR/T Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage IR = 100 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 A Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient(Note 6) IR = 100 A 4.1 8.2 mV (max) 31 35 mV (max) 68 68 A (max) 73 73 A (max) A 30 20 IRMIN IR 1 mA ppm/C 100 0.5 mV VR Reverse Breakdown Voltage Long Term Stability t = 1000 hrs T = 25C 0.1C IR = 100 A VHYST Thermal Hysteresis (Note 8) T = -40C to +125C 0.9 1.2 3.0 mV (max) mV (max) mV 7.0 10.0 7.0 10.0 1.0 1.0 mV (max) mV (max) 0.5 IR = 100 A Wideband Noise ppm/C (max) ppm/C IAC = 0.1 IR eN 100 20 0.9 1.2 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, Units (Limit) V 50 1 mA IR 15 mA ZR LM4040BIM3 LM4040BIZ LM4040BIM7 Limits (Note 5) 4.096 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note 7) LM4040AIM3 LM4040AIZ Limits (Note 5) (max) 80 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz www.national.com 14 LM4040 LM4040-4.1 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades C and D designate initial Reverse Breakdown Voltage tolerances of 0.5% and 1.0%, respectively. Symbol VR IRMIN Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage IR = 100 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 A 20 41 mV (max) 47 81 mV (max) 68 73 A (max) 73 78 A (max) A 30 20 IRMIN IR 1 mA ppm/C 100 0.5 mV IR = 100 A VR Reverse Breakdown Voltage Long Term Stability t = 1000 hrs T = 25C 0.1C IR = 100 A VHYST Thermal Hysteresis (Note 8) T = -40C to +125C 1.2 1.5 mV (max) mV (max) mV 7.0 10.0 9.0 13.0 1.0 1.3 mV (max) mV (max) 0.5 IAC = 0.1 IR Wideband Noise ppm/C (max) ppm/C 3.0 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, eN 150 20 0.9 1.2 1 mA IR 15 mA Units (Limit) V 50 VR/T Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 A ZR LM4040DIM3 LM4040DIZ LM4040DIM7 Limits (Note 5) 4.096 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note 7) LM4040CIM3 LM4040CIZ LM4040CIM7 Limits (Note 5) (max) 80 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz 15 www.national.com LM4040 LM4040-5.0 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A and B designate initial Reverse Breakdown Voltage tolerances of 0.1% and 0.2%, respectively. Symbol VR IRMIN Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage IR = 100 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 A IRMIN IR 1 mA VR 38 43 mV (max) 74 74 A (max) 80 80 A (max) A ppm/C 100 100 ppm/C 0.5 mV 1.0 1.4 mV (max) mV (max) mV 8.0 12.0 8.0 12.0 1.1 1.1 mV (max) mV (max) 0.5 IR = 100 A ppm/C (max) 20 IAC = 0.1 IR Reverse Breakdown Voltage Long Term Stability mV (max) 3.5 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, Wideband Noise 10 1.0 1.4 1 mA IR 15 mA eN 5.0 30 20 Units (Limit) V 54 VR/T Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 A ZR LM4040BIM3 LM4040BIZ LM4040BIM7 Limits (Note 5) 5.000 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note 7) LM4040AIM3 LM4040AIZ Limits (Note 5) (max) 80 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz t = 1000 hrs T = 25C 0.1C IR = 100 A VHYST Thermal Hysteresis (Note 8) www.national.com T = -40C to +125C 16 LM4040 LM4040-5.0 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades C and D designate initial Reverse Breakdown Voltage tolerances of 0.5% and 1.0%, respectively. Symbol VR IRMIN Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage IR = 100 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 A IRMIN IR 1 mA VR 58 99 mV (max) 74 79 A (max) 80 85 A (max) A ppm/C 100 150 ppm/C 0.5 mV 1.3 1.8 mV (max) mV (max) mV 8.0 12.0 10.0 15.0 1.1 1.5 mV (max) mV (max) 0.5 IR = 100 A ppm/C (max) 20 IAC = 0.1 IR Reverse Breakdown Voltage Long Term Stability mV (max) 3.5 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, Wideband Noise 50 1.0 1.4 1 mA IR 15 mA eN 25 30 20 Units (Limit) V 54 VR/T Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 A ZR LM4040DIM3 LM4040DIZ LM4040DIM7 Limits (Note 5) 5.000 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note 7) LM4040CIM3 LM4040CIZ LM4040CIM7 Limits (Note 5) (max) 80 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz t = 1000 hrs T = 25C 0.1C IR = 100 A VHYST Thermal Hysteresis (Note 8) T = -40C to +125C 17 www.national.com LM4040 LM4040-5.0 Electrical Characteristics (Extended Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades C and D designate initial Reverse Breakdown Voltage tolerances of 0.5% and 1.0%, respectively. Typical Symbol Parameter Conditions (Note 4) VR Reverse Breakdown Voltage IR = 100 A Minimum Operating Current 30 VR/IR Reverse Breakdown Voltage IRMIN IR 1 mA Change with Operating Current Change (Note 7) 0.5 20 50 mV (max) 75 125 mV (max) 74 79 A (max) 83 88 A (max) A VR Reverse Breakdown Voltage t = 1000 hrs Long Term Stability T = 25C 0.1C IR = 100 A 150 ppm/C (max) ppm/C mV 1.0 1.8 3.5 IR = 100 A Wideband Noise 100 1.0 1.4 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, IAC = 0.1 IR eN ppm/C 20 1 mA IR 15 mA ZR 25 54 VR/T Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 A Units (Limit) V 5.000 Reverse Breakdown Voltage IR = 100 A Tolerance(Note 6) IRMIN LM4040CEM3 LM4040DEM3 Limits Limits (Note 5) (Note 5) mV (max) mV (max) mV 8.0 12.0 8.0 15.0 mV (max) mV (max) 1.1 1.1 (max) 0.5 80 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz VHYST Thermal Hysteresis (Note 8) www.national.com T = -40C to +125C 18 LM4040 LM4040-8.2 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A and B designate initial Reverse Breakdown Voltage tolerances of 0.1% and 0.2%, respectively. Symbol VR IRMIN VR/T Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage IR = 150 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 150 A Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient(Note 6) IR = 150 A IRMIN IR 1 mA VR Reverse Breakdown Voltage Long Term Stability mV (max) 61 70 mV (max) 91 91 A (max) 95 95 A (max) A ppm/C 100 100 ppm/C 0.6 mV 1.3 2.5 7.0 mV (max) mV (max) mV 10.0 18.0 10.0 18.0 1.5 1.5 mV (max) mV (max) 0.6 IR = 150 A ppm/C (max) 20 IAC = 0.1 IR Wideband Noise 16 1.3 2.5 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, eN 8.2 40 20 Units (Limit) V 67 1 mA IR 15 mA ZR LM4040BIM3 LM4040BIZ Limits (Note 5) 8.192 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note 7) LM4040AIM3 LM4040AIZ Limits (Note 5) (max) 130 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz t = 1000 hrs T = 25C 0.1C IR = 150 A VHYST Thermal Hysteresis (Note 8) T = -40C to +125C 19 www.national.com LM4040 LM4040-8.2 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades C and D designate initial Reverse Breakdown Voltage tolerances of 0.5% and 1.0%, respectively. Symbol VR IRMIN VR/T Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage IR = 150 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 150 A Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 150 A IRMIN IR 1 mA VR Reverse Breakdown Voltage Long Term Stability mV (max) 94 162 mV (max) 91 96 A (max) 95 100 A (max) A ppm/C 100 150 ppm/C 0.6 mV 1.7 3.0 7.0 mV (max) mV (max) mV 10.0 18.0 15.0 24.0 1.5 1.9 mV (max) mV (max) 0.6 IR = 150 A ppm/C (max) 20 IAC = 0.1 IR Wideband Noise 82 1.3 2.5 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, eN 41 40 20 Units (Limit) V 67 1 mA IR 15 mA ZR LM4040DIM3 LM4040DIZ Limits (Note 5) 8.192 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note 7) LM4040CIM3 LM4040CIZ Limits (Note 5) (max) 130 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz t = 1000 hrs T = 25C 0.1C IR = 150 A VHYST Thermal Hysteresis (Note 8) www.national.com T = -40C to +125C 20 LM4040 LM4040-10.0 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A and B designate initial Reverse Breakdown Voltage tolerances of 0.1% and 0.2%, respectively. Symbol VR IRMIN VR/T Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage IR = 150 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 150 A Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 150 A IRMIN IR 1 mA VR Reverse Breakdown Voltage Long Term Stability mV (max) 75 85 mV (max) 100 100 A (max) 103 103 A (max) A ppm/C 100 100 ppm/C 0.8 mV 1.5 3.5 8.0 mV (max) mV (max) mV 12.0 23.0 12.0 23.0 1.7 1.7 mV (max) mV (max) 0.7 IR = 150 A ppm/C (max) 20 IAC = 0.1 IR Wideband Noise 20 1.5 3.5 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, eN 10 40 20 Units (Limit) V 75 1 mA IR 15 mA ZR LM4040BIM3 LM4040BIZ Limits (Note 5) 10.00 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note 7) LM4040AIM3 LM4040AIZ Limits (Note 5) (max) 180 Vrms 120 ppm 0.08 % 10 Hz f 10 kHz t = 1000 hrs T = 25C 0.1C IR = 150 A VHYST Thermal Hysteresis (Note 8) T = -40C to +125C 21 www.national.com LM4040 LM4040-10.0 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades C and D designate initial Reverse Breakdown Voltage tolerances of 0.5% and 1.0%, respectively. Symbol VR IRMIN VR/T Parameter Typical (Note 4) Conditions Reverse Breakdown Voltage IR = 150 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 150 A Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 150 A IRMIN IR 1 mA Reverse Breakdown Voltage Long Term Stability 115 198 mV (max) 100 110 A (max) 103 113 A (max) A ppm/C 100 150 0.8 mV 2.0 4.0 mV (max) mV (max) mV 12.0 23.0 18.0 29.0 1.7 2.3 mV (max) mV (max) 0.7 IR = 150 A ppm/C (max) ppm/C 8.0 10 Hz f 10 kHz VR mV (max) 1.5 3.5 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, Wideband Noise 100 20 IAC = 0.1 IR eN 50 40 20 Units (Limit) V 75 1 mA IR 15 mA ZR LM4040DIM3 LM4040DIZ Limits (Note 5) 10.00 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note 7) LM4040CIM3 LM4040CIZ Limits (Note 5) (max) 180 Vrms 120 ppm 0.08 % t = 1000 hrs T = 25C 0.1C IR = 150 A VHYST Thermal Hysteresis (Note 8) www.national.com T = -40C to +125C 22 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), JA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA)/JA or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4040, TJmax = 125C, and the typical thermal resistance (JA), when board mounted, is 326C/W for the SOT-23 package, and 180C/W with 0.4 lead length and 170C/W with 0.125 lead length for the TO-92 package and 415C/W for the SC70 Package. Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. Note 4: Typicals are at TJ = 25C and represent most likely parametric norm. Note 5: Limits are 100% production tested at 25C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National's AOQL. Note 6: The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance [(VR/T)(maxT)(VR)]. Where, VR/T is the VR temperature coefficient, maxT is the maximum difference in temperature from the reference point of 25C to T MIN or TMAX, and VR is the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature range where maxT = 65C is shown below: A-grade: 0.75% = 0.1% 100 ppm/C x 65C B-grade: 0.85% = 0.2% 100 ppm/C x 65C C-grade: 1.15% = 0.5% 100 ppm/C x 65C D-grade: 1.98% = 1.0% 150 ppm/C x 65C E-grade: 2.98% = 2.0% 150 ppm/C x 65C The total over-temperature tolerance for the different grades in the exteded temperature range where max T = 100 C is shown below: C-grade: 1.5% = 0.5% 100 ppm/C x 100C D-grade: 2.5% = 1.0% 150 ppm/C x 100C E-grade: 3.5% = 2.0% 150 ppm/C x 100C Therefore, as an example, the A-grade LM4040-2.5 has an over-temperature Reverse Breakdown Voltage tolerance of 2.5V x 0.75% = 19 mV. Note 7: Load regulation is measured on pulse basis from no load to the specified load current. Output changes due to die temperature change must be taken into account separately. Note 8: Thermal hysteresis is defined as the difference in voltage measured at +25C after cycling to temperature -40C and the 25C measurement after cycling to temperature +125C. 23 www.national.com LM4040 Electrical Characteristics(Notes) LM4040 Typical Performance Characteristics Temperature Drift for Different Average Temperature Coefficient Output Impedance vs Frequency 1132310 1132304 Output Impedance vs Frequency Reverse Characteristics and Minimum Operating Current 1132311 1132312 Noise Voltage vs Frequency 1132313 www.national.com 24 LM4040 Start-Up Characteristics LM4040-2.5 RS = 30k 1132305 1132307 LM4040-5.0 RS = 30k LM4040-10.0 1132308 RS = 30k 1132309 Functional Block Diagram 1132314 25 www.national.com LM4040 device is thermal cycled to temperature -40C and then measured at 25C. Next the device is thermal cycled to temperature +125C and again measured at 25C. The resulting VOUT delta shift between the 25C measurements is thermal hysteresis. Thermal hysteresis is common in precision references and is induced by thermal-mechanical package stress. Changes in environmental storage temperature, operating temperature and board mounting temperature are all factors that can contribute to thermal hysteresis. In a conventional shunt regulator application (Figure 1) , an external series resistor (RS) is connected between the supply voltage and the LM4040. RS determines the current that flows through the load (IL) and the LM4040 (IQ). Since load current and supply voltage may vary, RS should be small enough to supply at least the minimum acceptable IQ to the LM4040 even when the supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum and IL is at its minimum, RS should be large enough so that the current flowing through the LM4040 is less than 15 mA. RS is determined by the supply voltage, (VS), the load and operating current, (IL and IQ), and the LM4040's reverse breakdown voltage, VR. Applications Information The LM4040 is a precision micro-power curvature-corrected bandgap shunt voltage reference. For space critical applications, the LM4040 is available in the sub-miniature SOT-23 and SC70 surface-mount package. The LM4040 has been designed for stable operation without the need of an external capacitor connected between the "+" pin and the "-" pin. If, however, a bypass capacitor is used, the LM4040 remains stable. Reducing design effort is the availability of several fixed reverse breakdown voltages: 2.048V, 2.500V, 3.000V, 4.096V, 5.000V, 6.000, 8.192V, and 10.000V. The minimum operating current increases from 60 A for the LM4040-2.048 and LM4040-2.5 to 100 A for the LM4040-10.0. All versions have a maximum operating current of 15 mA. LM4040s in the SOT-23 packages have a parasitic Schottky diode between pin 2 (-) and pin 3 (Die attach interface contact). Therefore, pin 3 of the SOT-23 package must be left floating or connected to pin 2. LM4040s in the SC70 have a parasitic Schottky diode between pin 1 (-) and pin 2 (Die attach interface contact). Therefore, pin 2 must be left floating or connected to pin1. The 4.096V version allows single +5V 12-bit ADCs or DACs to operate with an LSB equal to 1 mV. For 12-bit ADCs or DACs that operate on supplies of 10V or greater, the 8.192V version gives 2 mV per LSB. The typical thermal hysteresis specification is defined as the change in +25C voltage measured after thermal cycling. The Typical Applications 1132315 FIGURE 1. Shunt Regulator www.national.com 26 LM4040 1132316 **Ceramic monolithic *Tantalum FIGURE 2. LM4040-4.1's Nominal 4.096 breakdown voltage gives ADC12451 1 mV/LSB 27 www.national.com LM4040 1132317 FIGURE 3. Bounded amplifier reduces saturation-induced delays and can prevent succeeding stage damage. Nominal clamping voltage is 11.5V (LM4040's reverse breakdown voltage +2 diode VF). 1132318 FIGURE 4. Protecting Op Amp input. The bounding voltage is 4V with the LM4040-2.5 (LM4040's reverse breakdown voltage + 3 diode VF). www.national.com 28 LM4040 1132319 FIGURE 5. Precision 4.096V Reference 1132321 1132322 FIGURE 6. Precision 1 A to 1 mA Current Sources 29 www.national.com LM4040 Physical Dimensions inches (millimeters) unless otherwise noted Plastic Surface Mount Package (M3) NS Package Number MF03A (JEDEC Registration TO-236AB) www.national.com 30 LM4040 Plastic Package (Z) NS Package Number Z03A Molded Package (SC70) NS Package Number MAA05A 31 www.national.com LM4040 Precision Micropower Shunt Voltage Reference Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise(R) Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise(R) Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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