LM4050 LM4050/LM4050Q Precision Micropower Shunt Voltage Reference Literature Number: SNOS455D LM4050/LM4050Q Precision Micropower Shunt Voltage Reference General Description Key Specifications (LM4050-2.5) Ideal for space critical applications, the LM4050 precision voltage reference is available in the sub-miniature (3 mm x 1.3 mm) SOT-23 surface-mount package. The LM4050's design eliminates the need for an external stabilizing capacitor while ensuring stability with any capacitive load, thus making the LM4050 easy to use. Further reducing design effort is the availability of several fixed reverse breakdown voltages: 2.048V, 2.500V, 4.096V, 5.000V, 8.192V, and 10.000V. The minimum operating current increases from 60 A for the LM4050-2.0 to 100 A for the LM4050-10.0. All versions have a maximum operating current of 15 mA. The LM4050 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. All grades and voltage options of the LM4050 are available in both an industrial temperature range (-40C and +85C) and an extended temperature range (-40C and +125C). Output voltage tolerance Features Small packages: SOT-23 No output capacitor required Tolerates capacitive loads Fixed reverse breakdown voltages of 2.048V, 2.500V, 4.096V, 5.000V, 8.192V, and 10.000V (A grade, 25C) 0.1% (max) Low output noise (10 Hz to 10 kHz) Wide operating current range 41 Vrms(typ) 60 A to 15 mA Industrial temperature range -40C to +85C Extended temperature range -40C to +125C Low temperature coefficient 50 ppm/C (max) LM4050QA/QB/QC are AECQ100 Grade 1 qualified and are manufactured on an automotive grade flow Applications Portable, Battery-Powered Equipment Data Acquisition Systems Instrumentation Process Control Energy Management Product Testing Automotive Precision Audio Components Connection Diagram SOT-23 10104501 *This pin must be left floating or connected to pin 2. Top View See NS Package Number MF03A (c) 2011 Texas Instruments Incorporated 101045 www.ti.com LM4050/LM4050Q Precision Micropower Shunt Voltage Reference November 10, 2011 LM4050/LM4050Q Ordering Information Industrial Temperature Range (-40C to +85C) Reverse Breakdown Voltage Tolerance at 25C and Average Reverse LM4050 Supplied as 1000 Units, Tape LM4050 Supplied as 3000 Units, Tape Breakdown and Reel and Reel Voltage Temperature Coefficient 0.1%, 50 ppm/C max (A grade) 0.2%, 50 ppm/C max (B grade) 0.5%, 50 ppm/C max (C grade) LM4050AIM3-2.0 LM4050AIM3X-2.0 LM4050AIM3-2.5 LM4050AIM3X-2.5 LM4050AIM3-4.1 LM4050AIM3X-4.1 LM4050AIM3-5.0 LM4050AIM3X-5.0 LM4050AIM3-8.2 LM4050AIM3X-8.2 LM4050AIM3-10 LM4050AIM3X-10 LM4050BIM3-2.0 LM4050BIM3X-2.0 LM4050BIM3-2.5 LM4050BIM3X-2.5 LM4050BIM3-4.1 LM4050BIM3X-4.1 LM4050BIM3-5.0 LM4050BIM3X-5.0 LM4050BIM3-8.2 LM4050BIM3X-8.2 LM4050BIM3-10 LM4050BIM3X-10 LM4050CIM3-2.0 LM4050CIM3X-2.0 LM4050CIM3-2.5 LM4050CIM3X-2.5 LM4050CIM3-4.1 LM4050CIM3X-4.1 LM4050CIM3-5.0 LM4050CIM3X-5.0 LM4050CIM3-8.2 LM4050CIM3X-8.2 LM4050CIM3-10 LM4050CIM3X-10 Extended Temperature Range (-40C to +125C) Reverse Breakdown Voltage Tolerance at 25C and Average Reverse LM4050 Supplied as 1000 Units, Tape LM4050 Supplied as 3000 Units, Tape Breakdown and Reel and Reel Voltage Temperature Coefficient 0.1%, 50 ppm/C max (A grade) 0.2%, 50 ppm/C max (B grade) 0.5%, 50 ppm/C max (C grade) www.ti.com LM4050AEM3-2.0 LM4050AEM3X-2.0 LM4050AEM3-2.5 LM4050AEM3X-2.5 LM4050AEM3-4.1 LM4050AEM3X-4.1 LM4050AEM3-5.0 LM4050AEM3X-5.0 LM4050AEM3-8.2 LM4050AEM3X-8.2 LM4050AEM3-10 LM4050AEM3X-10 LM4050BEM3-2.0 LM4050BEM3X-2.0 LM4050BEM3-2.5 LM4050BEM3X-2.5 LM4050BEM3-4.1 LM4050BEM3X-4.1 LM4050BEM3-5.0 LM4050BEM3X-5.0 LM4050BEM3-8.2 LM4050BEM3X-8.2 LM4050BEM3-10 LM4050BEM3X-10 LM4050CEM3-2.0 LM4050CEM3X-2.0 LM4050CEM3-2.5 LM4050CEM3X-2.5 LM4050CEM3-4.1 LM4050CEM3X-4.1 LM4050CEM3-5.0 LM4050CEM3X-5.0 LM4050CEM3-8.2 LM4050CEM3X-8.2 LM4050CEM3-10 LM4050CEM3X-10 2 Reverse Breakdown Voltage Tolerance at 25C and Average Reverse Breakdown Voltage Temperature Coefficient 0.1%, 50 ppm/C max (Q A grade) 0.2%, 50 ppm/C max (Q B grade) 0.5%, 50 ppm/C max (Q C grade) LM4050Q Supplied as 1000 Units, Tape and Reel LM4050Q Supplied as 3000 Units, Tape and Reel LM4050QAIM3-2.0 LM4050QAIM3X2.0 LM4050QAIM3-2.5 LM4050QAIM3X2.5 LM4050QAIM3-4.1 LM4050QAIM3X4.1 LM4050QAIM3-5.0 LM4050QAIM3X5.0 LM4050QAIM3-8.2 LM4050QAIM3X8.2 LM4050QAIM3-10 LM4050QAIM3X10 LM4050QBIM3-2.0 LM4050QBIM3X2.0 LM4050QBIM3-2.5 LM4050QBIM3X2.5 LM4050QBIM3-4.1 LM4050QBIM3X4.1 LM4050QBIM3-5.0 LM4050QBIM3X5.0 LM4050QBIM3-8.2 LM4050QBIM3X8.2 LM4050QBIM3-10 LM4050QBIM3X10 LM4050QCIM3-2.0 LM4050QCIM3X2.0 LM4050QCIM3-2.5 LM4050QCIM3X2.5 LM4050QCIM3-4.1 LM4050QCIM3X4.1 LM4050QCIM3-5.0 LM4050QCIM3X5.0 LM4050QCIM3-8.2 LM4050QCIM3X8.2 LM4050QCIM3-10 LM4050QCIM3X10 Extended Temperature Range (-40C to +125C) Reverse Breakdown Voltage Tolerance at 25C and Average Reverse Breakdown Voltage Temperature Coefficient 0.1%, 50 ppm/C max (Q A grade) 0.2%, 50 ppm/C max (Q B grade) 0.5%, 50 ppm/C max (Q C grade) LM4050Q Supplied as 1000 Units, Tape and Reel LM4050Q Supplied as 3000 Units, Tape and Reel LM4050QAEM3-2.0 LM4050QAEM3X2.0 LM4050QAEM3-2.5 LM4050QAEM3X2.5 LM4050QAEM3-4.1 LM4050QAEM3X4.1 LM4050QAEM3-5.0 LM4050QAEM3X5.0 LM4050QAEM3-8.2 LM4050QAEM3X8.2 LM4050QAEM3-10 LM4050QAEM3X10 LM4050QBEM3-2.0 LM4050QBEM3X2.0 LM4050QBEM3-2.5 LM4050QBEM3X2.5 LM4050QBEM3-4.1 LM4050QBEM3X4.1 LM4050QBEM3-5.0 LM4050QBEM3X5.0 LM4050QBEM3-8.2 LM4050QBEM3X8.2 LM4050QBEM3-10 LM4050QBEM3X10 LM4050QCEM3-2.0 LM4050QCEM3X2.0 LM4050QCEM3-2.5 LM4050QCEM3X2.5 LM4050QCEM3-4.1 LM4050QCEM3X4.1 LM4050QCEM3-5.0 LM4050QCEM3X5.0 LM4050QCEM3-8.2 LM4050QCEM3X8.2 LM4050QCEM3-10 LM4050QCEM3X10 3 www.ti.com LM4050/LM4050Q Industrial Temperature Range (-40C to +85C) LM4050/LM4050Q SOT-23 Package Marking Information Only three fields of marking are possible on the SOT-23's small surface. This table gives the meaning of the three fields. Part Marking First Field: R = Reference Second Field: N = 2.048V Voltage Option C = 2.500V Voltage Option D = 4.096V Voltage Option RCB RDB REB RFB E = 5.000V Voltage Option RGB RNB RCC RDC REC RFC RGC RNC www.ti.com Field Definition RCA RDA REA RFA RGA RNA F = 8.192V Voltage Option G = 10.000V Voltage Option Third Field: A-C = Initial Reverse Breakdown Voltage or Reference Voltage Tolerance A = 0.1%, B = 0.2%, C = +0.5%, 4 If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. Reverse Current Forward Current Power Dissipation (TA = 25C) (Note 2) M3 Package Storage Temperature Lead Temperature M3 Package Vapor phase (60 seconds) Infrared (15 seconds) ESD Susceptibility Human Body Model (Note 3) Operating Ratings 20 mA 10 mA Industrial Temperature Range Extended temperature Range Reverse Current LM4050-2.0, 280 mW -65C to +150C +215C +220C 2 kV (Note 2) (Tmin TA Tmax) Temperature Range -40C TA +85C -40C TA +125C 60 A to 15 mA LM4050-2.5 60 A to 15 mA LM4050-4.1 68 A to 15 mA LM4050-5.0 74 A to 15 mA LM4050-8.2 91 A to 15 mA LM4050-10.0 100 A to 15 mA LM4050-2.0 Electrical Characteristics Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A, B and C designate initial Reverse Breakdown Voltage tolerances of 0.1%, 0.2%, and 0.5% respectively. Symbol VR Parameter Reverse Breakdown Voltage Conditions IR = 100 A Typical (Note 4) 2.048 Reverse Breakdown IR = 100 A Voltage Tolerance (Note 6) Industrial Temp. Range Extended Temp. Range IRMIN VR/T VR/IR LM4050CIM LM4050AIM3 LM4050BIM3 3 LM4050AEM LM4050BEM LM4050CEM 3 3 3 Limits Limits Limits (Note 5) (Note 5) (Note 5) Minimum Operating Current Units (Limit) V 2.048 4.096 10.24 mV (max) 9.0112 11.4688 14.7456 mV (max) 12.288 14.7456 17.2032 60 60 60 A (max) 65 65 65 A (max) mV (max) A 41 Average Reverse Breakdown Voltage Temperature Coefficient (Note 6) IR = 10 mA 20 ppm/C IR = 1 mA 15 ppm/C IR = 100 A 15 Reverse Breakdown Voltage Change with Operating Current Change (Note 7) IRMIN IR 1 mA 0.3 1 mA IR 15 mA 50 50 50 ppm/C (max) mV 0.8 0.8 0.8 mV (max) 1.2 1.2 1.2 mV (max) 2.3 mV 6.0 8.0 6.0 8.0 6.0 8.0 mV (max) mV (max) ZR Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, IAC = 0.1 IR 0.3 eN Wideband Noise IR = 100 A 34 Vrms 10 Hz f 10 kHz 5 www.ti.com LM4050/LM4050Q 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) LM4050/LM4050Q Symbol VR VHYST Parameter Conditions Typical (Note 4) Reverse Breakdown t = 1000 hrs Voltage Long Term Stability T = 25C 0.1C IR = 100 A Thermal Hysteresis (Note 8) LM4050CIM LM4050AIM3 LM4050BIM3 3 LM4050AEM LM4050BEM LM4050CEM 3 3 3 Limits Limits Limits (Note 5) (Note 5) (Note 5) 120 T = -40C to 125C Units (Limit) ppm 0.7 mV LM4050-2.5 Electrical Characteristics Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A, B and C designate initial Reverse Breakdown Voltage tolerances of 0.1%, 0.2%, and 0.5% respectively. Symbol VR IRMIN VR/T VR/IR Parameter Typical (Note 4) Conditions LM4050AI LM4050BI LM4050CI M3 M3 M3 LM4050AE LM4050BE LM4050CE M3 M3 M3 Limits Limits Limits (Note 5) (Note 5) (Note 5) Units (Limit) Reverse Breakdown Voltage IR = 100 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 A 2.5 5.0 13 mV (max) Industrial Temp. Range Extended Temp. Range 11 15 14 18 21 25 mV (max) mV (max) 60 60 60 A (max) 65 65 65 A (max) 2.500 Minimum Operating Current A 41 Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 A Reverse Breakdown Voltage Change with Operating Current Change (Note 7) V 20 ppm/C 15 ppm/C 15 IRMIN IR 1 mA 50 50 50 ppm/C (max) 0.8 1.2 0.8 1.2 0.8 1.2 mV (max) mV (max) 6.0 8.0 6.0 8.0 6.0 8.0 mV (max) mV (max) 0.3 1 mA IR 15 mA mV 2.3 mV 0.3 41 Vrms t = 1000 hrs T = 25C 0.1C IR = 100 A 120 ppm T = -40C to 125C 0.7 ZR Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, IAC = 0.1 IR eN Wideband Noise VR Reverse Breakdown Voltage Long Term Stability Thermal Hysteresis (Note 8) IR = 100 A 10 Hz f 10 kHz VHYST www.ti.com 6 mV Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A, B and C designate initial Reverse Breakdown Voltage tolerances of 0.1%, 0.2%, and 0.5% respectively. Symbol VR IRMIN VR/T VR/IR Parameter Typical (Note 4) Conditions Units (Limit) Reverse Breakdown Voltage IR = 100 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 A 4.1 8.2 21 mV (max) Industrial Temp. Range Extended Temp. Range 18 25 22 29 34 41 mV (max) mV (max) 68 68 68 A (max) Industrial Temp. Range 73 73 73 A (max) Extended Temp. Range 78 78 78 A (max) 4.096 Minimum Operating Current Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 A Reverse Breakdown Voltage Change with Operating Current Change (Note 7) V A 52 30 ppm/C 20 ppm/C 20 IRMIN IR 1 mA 50 50 50 0.2 1 mA IR 15 mA ZR LM4050AI LM4050BI LM4050CI M3 M3 M3 LM4050AE LM4050BE LM4050CE M3 M3 M3 Limits Limits Limits (Note 5) (Note 5) (Note 5) mV 0.9 1.2 0.9 1.2 0.9 1.2 mV (max) mV (max) 7.0 10.0 7.0 10.0 7.0 10.0 mV (max) mV (max) 2.0 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, ppm/C (max) mV 0.5 93 Vrms 120 ppm 1.148 mV IAC = 0.1 IR eN Wideband Noise IR = 100 A 10 Hz f 10 kHz VR VHYST Reverse Breakdown Voltage Long Term Stability t = 1000 hrs T = 25C 0.1C IR = 100 A Thermal Hysteresis (Note 8) T = -40C to 125C 7 www.ti.com LM4050/LM4050Q LM4050-4.1 Electrical Characteristics LM4050/LM4050Q LM4050-5.0 Electrical Characteristics Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A, B and C designate initial Reverse Breakdown Voltage tolerances of 0.1%, 0.2% and 0.5% respectively. Symbol VR IRMIN Parameter Typical (Note 4) Conditions LM4050BI M3 LM4050BE M3 Limits (Note 5) LM4050CI M3 LM4050CE M3 Limits (Note 5) Units (Limit) Reverse Breakdown Voltage IR = 100 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 A 5.0 10 25 mV (max) Industrial Temp. Range Extended Temp. Range 22 30 27 35 42 50 mV (max) mV (max) 74 74 74 A (max) Industrial Temp. Range 80 80 80 A (max) Extended Temp. Range 90 90 90 A (max) 5.000 Minimum Operating Current VR/IR Reverse Breakdown Voltage Change with Operating Current Change (Note 7) 20 IRMIN IR 1 mA Reverse Breakdown Voltage Long Term Stability ppm/C 50 50 50 ppm/C (max) 1.0 1.4 1.0 1.4 1.0 1.4 mV (max) mV (max) 8.0 12.0 8.0 12.0 8.0 12.0 mV (max) mV (max) 0.2 mV 2.0 0.5 mV (max) IAC = 0.1 IR VR ppm/C 20 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, Wideband Noise A 30 1 mA IR 15 mA eN V 56 VR/T Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 A ZR LM4050AI M3 LM4050AE M3 Limits (Note 5) IR = 100 A 93 Vrms 120 ppm 10 Hz f 10 kHz t = 1000 hrs T = 25C 0.1C IR = 100 A VHYST www.ti.com Thermal Hysteresis (Note 8) T = -40C to 125C 1.4 8 mV Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A, B and C designate initial Reverse Breakdown Voltage tolerances of 0.1% and 0.2% and 0.5% respectively. Symbol VR IRMIN VR/T VR/IR Parameter Typical (Note 4) Conditions Units (Limit) Reverse Breakdown Voltage IR = 150 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 150 A 8.2 16 41 mV (max) Industrial Temp. Range Extended Temp. Range 35 49 43 57 68 82 mV (max) mV (max) 91 91 91 A (max) Industrial Temp. Range 95 95 95 A (max) Extended Temp. Range 100 100 100 A (max) 8.192 Minimum Operating Current Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 150 A Reverse Breakdown Voltage Change with Operating Current Change (Note 7) V A 74 40 ppm/C 20 20 IRMIN IR 1 mA ppm/C 50 50 50 ppm/C (max) 1.3 2.5 1.3 2.5 1.3 2.5 mV (max) mV (max) 10.0 18.0 10.0 18.0 10.0 18.0 mV (max) mV (max) 0.6 1 mA IR 15 mA ZR LM4050AI LM4050BI LM4050CI M3 M3 M3 LM4050AE LM4050BE LM4050CE M3 M3 M3 Limits Limits Limits (Note 5) (Note 5) (Note 5) mV 7.0 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, mV 0.6 150 Vrms 120 ppm IAC = 0.1 IR eN Wideband Noise VR Reverse Breakdown Voltage Long Term Stability IR = 150 A 10 Hz f 10 kHz t = 1000 hrs T = 25C 0.1C IR = 150 A VHYST Thermal Hysteresis (Note 8) T = -40C to 125C 2.3 9 mV www.ti.com LM4050/LM4050Q LM4050-8.2 Electrical Characteristics LM4050/LM4050Q LM4050-10.0 Electrical Characteristics Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C. The grades A, B and C designate initial Reverse Breakdown Voltage tolerances of 0.1% and 0.2% and 0.5% respectively. Typical (Note 4) Symbol VR IRMIN Parameter Conditions VR/IR IR = 150 A Reverse Breakdown Voltage Tolerance (Note 6) IR = 150 A 10 20 50 mV (max) Industrial Temp. Range Extended Temp. Range 43 60 53 70 83 100 mV (max) mV (max) 100 100 100 A (max) Industrial Temp. Range 103 103 103 A (max) Extended Temp. Range 110 110 110 A (max) 10.00 Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 150 A Reverse Breakdown Voltage Change with Operating Current Change (Note 7) V A 80 40 ppm/C 20 20 IRMIN IR 1 mA ppm/C 50 50 50 ppm/C (max) 1.5 3.5 1.5 3.5 1.5 3.5 mV (max) mV (max) 12.0 23.0 12.0 23.0 12.0 23.0 mV (max) mV (max) 0.8 1 mA IR 15 mA ZR Units (Limit) Reverse Breakdown Voltage Minimum Operating Current VR/T LM4050AI LM4050BI LM4050CI M3 M3 M3 LM4050AE LM4050BE LM4050CE M3 M3 M3 Limits Limits Limits (Note 5) (Note 5) (Note 5) mV 8.0 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, mV 0.7 150 Vrms 120 ppm IAC = 0.1 IR eN Wideband Noise VR Reverse Breakdown Voltage Long Term Stability IR = 150 A 10 Hz f 10 kHz t = 1000 hrs T = 25C 0.1C IR = 150 A VHYST Thermal Hysteresis (Note 8) T = -40C to 125C 2.8 mV 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 LM4050, TJmax = 125C, and the typical thermal resistance (JA), when board mounted, is 326C/W for the SOT-23 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 [(V R/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: 0.425% = 0.1% 50 ppm/C x 65C B-grade: 0.525% = 0.2% 50 ppm/C x 65C www.ti.com 10 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. Typical Performance Characteristics Output Impedance vs Frequency Output Impedance vs Frequency 10104510 10104511 Reverse Characteristics and Minimum Operating Current Noise Voltage vs Frequency 10104513 10104512 11 www.ti.com LM4050/LM4050Q C-grade: 0.825% = 0.5% 50 ppm/C x 65C Therefore, as an example, the A-grade LM4050-2.5 has an over-temperature Reverse Breakdown Voltage tolerance of 2.5V x 0.425% = 11 mV. LM4050/LM4050Q Thermal Hysteresis 10104529 LM4050-10.0 Start-Up Characteristics RS = 30k 10104505 LM4050-2.5 RS = 30k 10104509 10104507 LM4050-5.0 RS = 30k 10104508 www.ti.com 12 LM4050/LM4050Q Functional Block Diagram 10104514 sured 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 LM4050. RS determines the current that flows through the load (IL) and the LM4050 (IQ). Since load current and supply voltage may vary, RS should be small enough to supply at least the maximum guaranteed IRMIN (spec. table) to the LM4050 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 LM4050 is less than 15 mA. RS is determined by the supply voltage, (VS), the load and operating current, (IL and IQ), and the LM4050's reverse breakdown voltage, VR. Applications Information The LM4050 is a precision micro-power curvature-corrected bandgap shunt voltage reference. For space critical applications, the LM4050 is available in the sub-miniature SOT-23 surface-mount package. The LM4050 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 LM4050 remains stable. Reducing design effort is the availability of several fixed reverse breakdown voltages: 2.048V, 2.500V, 4.096V, 5.000V, 8.192V, and 10.000V. The minimum operating current increases from 60 A for the LM4050-2.0 to 100 A for the LM4050-10.0. All versions have a maximum operating current of 15 mA. LM4050s 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. 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 device is thermal cycled to temperature -40C and then mea- Typical Applications 10104515 FIGURE 1. Shunt Regulator 13 www.ti.com LM4050/LM4050Q 10104516 **Ceramic monolithic *Tantalum FIGURE 2. LM4050-4.1's Nominal 4.096 breakdown voltage gives ADC12451 1 mV/LSB www.ti.com 14 LM4050/LM4050Q 10104517 FIGURE 3. Bounded amplifier reduces saturation-induced delays and can prevent succeeding stage damage. Nominal clamping voltage is 11.5V (LM4050's reverse breakdown voltage +2 diode VF). 10104518 FIGURE 4. Protecting Op Amp input. The bounding voltage is 4V with the LM4050-2.5 (LM4050's reverse breakdown voltage + 3 diode VF). 15 www.ti.com LM4050/LM4050Q 10104519 FIGURE 5. Precision 4.096V Reference 10104521 10104522 FIGURE 6. Precision 1 A to 1 mA Current Sources www.ti.com 16 LM4050/LM4050Q Physical Dimensions inches (millimeters) unless otherwise noted Plastic Surface Mount Package (M3) NS Package Number MF03A (JEDEC Registration TO-236AB) 17 www.ti.com LM4050/LM4050Q Precision Micropower Shunt Voltage Reference Notes TI/NATIONAL INTERIM IMPORTANT NOTICE Texas Instruments has purchased National Semiconductor. As of Monday, September 26th, and until further notice, products sold or advertised under the National Semiconductor name or logo, and information, support and interactions concerning such products, remain subject to the preexisting National Semiconductor standard terms and conditions of sale, terms of use of website, and Notices (and/or terms previously agreed in writing with National Semiconductor, where applicable) and are not subject to any differing terms and notices applicable to other TI components, sales or websites. To the extent information on official TI and National websites and business social networking media, etc., pertains to both TI and National-branded products, both companies' instructions, warnings and limitations in the above-referenced terms of use apply. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products Applications Audio www.ti.com/audio Communications and Telecom www.ti.com/communications Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps DLP(R) Products www.dlp.com Energy and Lighting www.ti.com/energy DSP dsp.ti.com Industrial www.ti.com/industrial Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical Interface interface.ti.com Security www.ti.com/security Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionicsdefense Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video RFID www.ti-rfid.com www.ti.com/wireless-apps RF/IF and ZigBee(R) Solutions www.ti.com/lprf Wireless TI E2E Community Home Page e2e.ti.com Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright(c) 2011 Texas Instruments Incorporated www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI's terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional restrictions. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in such safety-critical applications. TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products Applications Audio www.ti.com/audio Communications and Telecom www.ti.com/communications Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps DLP(R) Products www.dlp.com Energy and Lighting www.ti.com/energy DSP dsp.ti.com Industrial www.ti.com/industrial Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical Interface interface.ti.com Security www.ti.com/security Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive Microcontrollers microcontroller.ti.com Video and Imaging RFID www.ti-rfid.com OMAP Mobile Processors www.ti.com/omap Wireless Connectivity www.ti.com/wirelessconnectivity TI E2E Community Home Page www.ti.com/video e2e.ti.com Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright (c) 2011, Texas Instruments Incorporated