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 μA for the LM4050-2.0 to 100 μA 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 25°C. 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 (−40°C and +85°C) and an extended temperature range (−40°C and +125°C). ■ 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, 25°C) ±0.1% (max) ■ Low output noise (10 Hz to 10 kHz) ■ ■ ■ ■ ■ Wide operating current range 41 μVrms(typ) 60 μA to 15 mA Industrial temperature range −40°C to +85°C Extended temperature range −40°C to +125°C 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 © 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 (−40°C to +85°C) Reverse Breakdown Voltage Tolerance at 25°C 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 (−40°C to +125°C) Reverse Breakdown Voltage Tolerance at 25°C 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 25°C 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 (−40°C to +125°C) Reverse Breakdown Voltage Tolerance at 25°C 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 (−40°C to +85°C) 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 = 25°C) (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 −65°C to +150°C +215°C +220°C 2 kV (Note 2) (Tmin ≤ TA ≤ Tmax) Temperature Range −40°C ≤ TA ≤ +85°C −40°C ≤ TA ≤ +125°C 60 μA to 15 mA LM4050-2.5 60 μA to 15 mA LM4050-4.1 68 μA to 15 mA LM4050-5.0 74 μA to 15 mA LM4050-8.2 91 μA to 15 mA LM4050-10.0 100 μA to 15 mA LM4050-2.0 Electrical Characteristics Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. 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 μA Typical (Note 4) 2.048 Reverse Breakdown IR = 100 μA Voltage Tolerance (Note 6) Industrial Temp. Range Extended Temp. Range IRMIN ΔVR/ΔT ΔVR/ΔIR 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 μA (max) 65 65 65 μA (max) mV (max) μA 41 Average Reverse Breakdown Voltage Temperature Coefficient (Note 6) IR = 10 mA ±20 ppm/°C IR = 1 mA ±15 ppm/°C IR = 100 μA ±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 Ω eN Wideband Noise IR = 100 μA 34 μVrms 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 ΔVR VHYST Parameter Conditions Typical (Note 4) Reverse Breakdown t = 1000 hrs Voltage Long Term Stability T = 25°C ±0.1°C IR = 100 μA Thermal Hysteresis (Note 8) LM4050CIM LM4050AIM3 LM4050BIM3 3 LM4050AEM LM4050BEM LM4050CEM 3 3 3 Limits Limits Limits (Note 5) (Note 5) (Note 5) 120 ΔT = −40°C to 125°C 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 = 25°C. The grades A, B and C designate initial Reverse Breakdown Voltage tolerances of ±0.1%, ±0.2%, and 0.5% respectively. Symbol VR IRMIN ΔVR/ΔT ΔVR/ΔIR 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 μA Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 μA ±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 μA (max) 65 65 65 μA (max) 2.500 Minimum Operating Current μA 41 Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 μA 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 Ω 41 μVrms t = 1000 hrs T = 25°C ±0.1°C IR = 100 μA 120 ppm ΔT = −40°C to 125°C 0.7 ZR Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, IAC = 0.1 IR eN Wideband Noise ΔVR Reverse Breakdown Voltage Long Term Stability Thermal Hysteresis (Note 8) IR = 100 μA 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 = 25°C. The grades A, B and C designate initial Reverse Breakdown Voltage tolerances of ±0.1%, ±0.2%, and 0.5% respectively. Symbol VR IRMIN ΔVR/ΔT ΔVR/ΔIR Parameter Typical (Note 4) Conditions Units (Limit) Reverse Breakdown Voltage IR = 100 μA Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 μA ±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 μA (max) Industrial Temp. Range 73 73 73 μA (max) Extended Temp. Range 78 78 78 μA (max) 4.096 Minimum Operating Current Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 μA Reverse Breakdown Voltage Change with Operating Current Change (Note 7) V μA 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 Ω 93 μVrms 120 ppm 1.148 mV IAC = 0.1 IR eN Wideband Noise IR = 100 μA 10 Hz ≤ f ≤ 10 kHz ΔVR VHYST Reverse Breakdown Voltage Long Term Stability t = 1000 hrs T = 25°C ±0.1°C IR = 100 μA Thermal Hysteresis (Note 8) ΔT = −40°C to 125°C 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 = 25°C. 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 μA Reverse Breakdown Voltage Tolerance (Note 6) IR = 100 μA ±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 μA (max) Industrial Temp. Range 80 80 80 μA (max) Extended Temp. Range 90 90 90 μA (max) 5.000 Minimum Operating Current ΔVR/ΔIR 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 Ω Ω (max) IAC = 0.1 IR ΔVR ppm/°C ±20 Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, Wideband Noise μA ±30 1 mA ≤ IR ≤ 15 mA eN V 56 ΔVR/ΔT Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 100 μA ZR LM4050AI M3 LM4050AE M3 Limits (Note 5) IR = 100 μA 93 μVrms 120 ppm 10 Hz ≤ f ≤ 10 kHz t = 1000 hrs T = 25°C ±0.1°C IR = 100 μA VHYST www.ti.com Thermal Hysteresis (Note 8) ΔT = −40°C to 125°C 1.4 8 mV Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C. 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 ΔVR/ΔT ΔVR/ΔIR Parameter Typical (Note 4) Conditions Units (Limit) Reverse Breakdown Voltage IR = 150 μA Reverse Breakdown Voltage Tolerance (Note 6) IR = 150 μA ±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 μA (max) Industrial Temp. Range 95 95 95 μA (max) Extended Temp. Range 100 100 100 μA (max) 8.192 Minimum Operating Current Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 150 μA Reverse Breakdown Voltage Change with Operating Current Change (Note 7) V μA 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 Ω 150 μVrms 120 ppm IAC = 0.1 IR eN Wideband Noise ΔVR Reverse Breakdown Voltage Long Term Stability IR = 150 μA 10 Hz ≤ f ≤ 10 kHz t = 1000 hrs T = 25°C ±0.1°C IR = 150 μA VHYST Thermal Hysteresis (Note 8) ΔT = −40°C to 125°C 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 = 25°C. 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 ΔVR/ΔIR IR = 150 μA Reverse Breakdown Voltage Tolerance (Note 6) IR = 150 μA ±10 ±20 ±50 mV (max) Industrial Temp. Range Extended Temp. Range ±43 ±60 ±53 ±70 ±83 ±100 mV (max) mV (max) 100 100 100 μA (max) Industrial Temp. Range 103 103 103 μA (max) Extended Temp. Range 110 110 110 μA (max) 10.00 Average Reverse Breakdown IR = 10 mA Voltage Temperature IR = 1 mA Coefficient (Note 6) IR = 150 μA Reverse Breakdown Voltage Change with Operating Current Change (Note 7) V μA 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 ΔVR/ΔT 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 Ω 150 μVrms 120 ppm IAC = 0.1 IR eN Wideband Noise ΔVR Reverse Breakdown Voltage Long Term Stability IR = 150 μA 10 Hz ≤ f ≤ 10 kHz t = 1000 hrs T = 25°C ±0.1°C IR = 150 μA VHYST Thermal Hysteresis (Note 8) ΔT = −40°C to 125°C 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), θJA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax − TA)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4050, TJmax = 125°C, and the typical thermal resistance (θJA), when board mounted, is 326°C/W for the SOT-23 package. Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. Note 4: Typicals are at TJ = 25°C and represent most likely parametric norm. Note 5: Limits are 100% production tested at 25°C. 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 ±[(ΔV R/ΔT)(maxΔT)(VR)]. Where, ΔVR/ΔT is the VR temperature coefficient, maxΔT is the maximum difference in temperature from the reference point of 25°C 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 maxΔT = 65°C is shown below: A-grade: ±0.425% = ±0.1% ±50 ppm/°C × 65°C B-grade: ±0.525% = ±0.2% ±50 ppm/°C × 65°C 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 +25°C after cycling to temperature -40°C and the 25°C measurement after cycling to temperature +125°C. 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 × 65°C Therefore, as an example, the A-grade LM4050-2.5 has an over-temperature Reverse Breakdown Voltage tolerance of ±2.5V × 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 25°C. Next the device is thermal cycled to temperature +125°C and again measured at 25°C. The resulting VOUT delta shift between the 25°C 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 μA for the LM4050-2.0 to 100 μA 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 +25°C voltage measured after thermal cycling. The device is thermal cycled to temperature -40°C 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 μA 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. 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