REF3012 REF3020 REF3025 REF3030 REF3033 REF3040 SBVS032E – MARCH 2002 – REVISED MARCH 2004 50ppm/°C Max, 50µA in SOT23-3 CMOS VOLTAGE REFERENCE FEATURES DESCRIPTION ● MicroSIZE PACKAGE: SOT23-3 The REF30xx is a precision, low power, low voltage dropout voltage reference family available in a tiny SOT23-3. ● LOW DROPOUT: 1mV The REF30xx small size and low power consumption (50µA max) make it ideal for portable and battery-powered applications. The REF30xx does not require a load capacitor, but is stable with any capacitive load. ● HIGH OUTPUT CURRENT: 25mA ● HIGH ACCURACY: 0.2% ● LOW IQ: 50µA max ● EXCELLENT SPECIFIED DRIFT PERFORMANCE: 50ppm/°C (max) from 0°C to +70°C 75ppm/°C (max) from –40°C to +125°C Unloaded, the REF30xx can be operated with supplies within 1mV of output voltage. All models are specified for the wide temperature range, –40°C to +125°C. APPLICATIONS PRODUCT VOLTAGE (V) REF3012 1.25 REF3020 2.048 ● DATA ACQUISITION SYSTEMS REF3025 2.5 ● MEDICAL EQUIPMENT REF3030 3.0 ● PORTABLE, BATTERY-POWERED EQUIPMENT ● HAND-HELD TEST EQUIPMENT REF3033 3.3 REF3040 4.096 DROPOUT VOLTAGE vs LOAD CURRENT 350 OUT 1 2 REF3012 REF3020 REF3025 REF3030 REF3033 REF3040 300 3 GND SOT23-3 Dropout Voltage (mV) IN 250 200 150 100 50 0 0 5 10 15 20 25 30 Load Current (mA) Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. Copyright © 2002-2004, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. www.ti.com ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC DISCHARGE SENSITIVITY Supply Voltage, V+ to V– ................................................................... 7.0V Output Short-Circuit(2) .............................................................. Continuous Operating Temperature .................................................. –40°C to +125°C This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. Storage Temperature ..................................................... –65°C to +150°C Junction Temperature .................................................................... +150°C Lead Temperature (soldering, 10s) ............................................... +300°C NOTES: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these, or any other conditions beyond those specified, is not implied. (2) Short circuit to ground. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. PACKAGE/ORDERING INFORMATION(1) PRODUCT REF3012 " REF3020 " REF3025 " REF3030 " REF3033 " REF3040 " PACKAGE-LEAD PACKAGE DESIGNATOR SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER TRANSPORT MEDIA, QUANTITY SO T23-3 DBZ –40°C to +125°C R30A " " " " REF3012AIDBZT REF3012AIDBZR Tape and Reel, 250 Tape and Reel, 3000 SOT23-3 DBZ –40°C to +125°C R30B " " " " REF3020AIDBZT REF3020AIDBZR Tape and Reel, 250 Tape and Reel, 3000 SOT23-3 DBZ –40°C to +125°C R30C " " " " REF3025AIDBZT REF3025AIDBZR Tape and Reel, 250 Tape and Reel, 3000 SOT23-3 DBZ –40°C to +125°C R30F " " " " REF3030AIDBZRT REF3030AIDBZR Tape and Reel, 250 Tape and Reel, 3000 SOT23-3 DBZ –40°C to +125°C R30D " " " " REF3033AIDBZT REF3033AIDBZR Tape and Reel, 250 Tape and Reel, 3000 SOT23-3 DBZ –40°C to +125°C R30E " " " " REF3040AIDBZT REF3040AIDBZR Tape and Reel, 250 Tape and Reel, 3000 NOTES: (1) For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet. ELECTRICAL CHARACTERISTICS Boldface limits apply over the specified temperature range, TA = –40°C to +125°C. At TA = +25°C, ILOAD = 0mA, VIN = 5V, unless otherwise noted. REF30xx PARAMETER CONDITIONS MIN TYP MAX UNITS 1.2475 1.25 1.2525 0.2 V % REF3012(1) - 1.25V OUTPUT VOLTAGE Initial Accuracy VOUT NOISE Output Voltage Noise Voltage Noise f = 0.1Hz to 10Hz f = 10Hz to 10kHz 14 42 LINE REGULATION 1.8V ≤ VIN ≤ 5.5V 60 190 µV/V 2.048 2.052 0.2 V % µVp-p µVrms REF3020 – 2.048 OUTPUT VOLTAGE Initial Accuracy VOUT 2.044 NOISE Output Voltage Noise Voltage Noise f = 0.1Hz to 10Hz f = 10Hz to 10kHz 23 65 LINE REGULATION VREF + 50mV ≤ VIN ≤ 5.5V 110 290 µV/V 2.50 2.505 0.2 V % µVp-p µVrms REF3025 – 2.5V OUTPUT VOLTAGE Initial Accuracy 2 VOUT 2.495 NOISE Output Voltage Noise Voltage Noise f = 0.1Hz to 10Hz f = 10Hz to 10kHz 28 80 LINE REGULATION VREF + 50mV ≤ VIN ≤ 5.5V 120 µVp-p µVrms 325 µV/V REF3012, 3020, 3025, 3030, 3033, 3040 www.ti.com SBVS032E ELECTRICAL CHARACTERISTICS Boldface limits apply over the specified temperature range, TA = –40°C to +125°C. At TA = +25°C, ILOAD = 0mA, VIN = 5V, unless otherwise noted. REF30xx PARAMETER CONDITIONS MIN TYP MAX UNITS 2.994 3.0 3.006 0.2 V % REF3030 – 3.0V OUTPUT VOLTAGE Initial Accuracy VOUT NOISE Output Voltage Noise Voltage Noise f = 0.1Hz to 10Hz f = 10Hz to 10kHz 33 94 LINE REGULATION VREF + 50mV ≤ VIN ≤ 5.5V 120 375 µV/V 3.30 3.306 0.2 V % µVp-p µVrms REF3033 – 3.3V OUTPUT VOLTAGE Initial Accuracy VOUT 3.294 NOISE Output Voltage Noise Voltage Noise f = 0.1Hz to 10Hz f = 10Hz to 10kHz 36 105 LINE REGULATION VREF + 50mV ≤ VIN ≤ 5.5V 130 400 µV/V 4.096 4.104 0.2 V % µVp-p µVrms REF3040 – 4.096V OUTPUT VOLTAGE Initial Accuracy VOUT 4.088 NOISE Output Voltage Noise Voltage Noise f = 0.1Hz to 10Hz f = 10Hz to 10kHz 45 128 LINE REGULATION VREF + 50mV ≤ VIN ≤ 5.5V 160 410 µV/V 0°C ≤ TA ≤ +70°C –30°C ≤ TA ≤ +85°C –40°C ≤ TA ≤ +85°C –40°C ≤ TA ≤ +125°C 20 28 30 35 50 60 65 75 ppm/°C ppm/°C ppm/°C ppm/°C 0-1000h 1000-2000h 24 15 0mA < ILOAD < 25mA, VIN = VREF + 500mV(1) 3 100 µV/mA 25 100 ppm VIN – VOUT 1 50 ISC 45 mA 120 µs µVp-p µVrms REF3012, REF3020, REF3025, REF3030, REF3033, REF3040 OUTPUT VOLTAGE TEMP DRIFT(2) dVOUT/dT LONG-TERM STABILITY LOAD REGULATION(3) THERMAL HYSTERESIS(4) DROPOUT VOLTAGE SHORT-CIRCUIT CURRENT dVOUT/dILOAD dT TURN ON SETTLING TIME POWER SUPPLY Voltage Over Temperature Quiescent Current to 0.1% at VIN = 5V with CL = 0 TEMPERATURE RANGE Specified Range Operating Range Storage Range Thermal Resistance SOT23-3 Surface-Mount NOTES: (1) (2) (3) (4) (5) VREF + 0.001(5) 5.5 V –40°C ≤ TA ≤ +125°C VREF + 0.05 5.5 50 V µA 59 µA +125 +125 +150 °C °C °C IQ 42 –40°C ≤ TA ≤ +125°C –40 –40 –65 θJC θJA 110 336 °C/W °C/W Minimum supply voltage for REF3012 is 1.8V. Box Method used to determine over temperature drift. Typical value of load regulation reflects measurements using a force and sense contacts, see text Load Regulation. Thermal hysteresis procedure is explained in more detail in Applications Information section of data sheet. For IL > 0, see Typical Characteristic curves. REF3012, 3020, 3025, 3030, 3033, 3040 SBVS032E mV IL = 0 VS Over Temperature ppm ppm 3 www.ti.com TYPICAL CHARACTERISTICS At TA = +25°C, VIN = +5V power supply, REF3025 is used for typical characteristics, unless otherwise noted. TEMPERATURE DRIFT (–40°C to +125°C) 100 45 90 40 80 35 70 Number of Units Number of Units TEMPERATURE DRIFT (0°C to +70°C) 50 30 25 20 15 60 50 40 30 10 20 5 10 0 0 5 5 10 15 20 25 30 35 40 45 50 55 60 65 10 15 20 25 30 35 40 45 50 55 60 65 Drift (ppm/°C) Drift (ppm/°C) MAXIMUM LOAD CURRENT vs TEMPERATURE OUTPUT VOLTAGE vs TEMPERATURE 35 Maximum Load Current (mA) 2.502 Output Voltage (V) 2.500 2.498 2.496 2.494 2.492 30 25 20 15 10 5 2.490 –40 –20 0 20 40 60 80 100 120 –40 140 –20 0 40 60 80 100 120 140 QUIESCENT CURRENT vs TEMPERATURE 6 60 5 50 4 40 IQ (µA) Load Regulation (µV/mA) LOAD REGULATION vs TEMPERATURE 3 30 2 20 1 10 0 0 –40 –20 0 20 40 60 80 100 120 140 –40 Temperature (°C) 4 20 Temperature (°C) Temperature (°C) –20 0 20 40 60 80 100 120 140 Temperature (°C) REF3012, 3020, 3025, 3030, 3033, 3040 www.ti.com SBVS032E TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VIN = +5V power supply, REF3025 is used for typical characteristics, unless otherwise noted. OUTPUT IMPEDANCE vs FREQUENCY LINE REGULATION vs TEMPERATURE 100 150 Output Impedance (dB) Line Regulation (µV/V) 200 100 50 0 –50 10 1 0.1 0.01 –40 –20 0 20 40 60 80 100 120 1 140 10 100 2.500010 80 2.500000 70 2.499990 Output Voltage (V) 90 60 PSRR (dB) 10k 100k OUTPUT VOLTAGE vs SUPPLY VOLTAGE (No Load) POWER-SUPPLY REJECTION RATIO vs FREQUENCY 50 40 30 2.499980 2.499970 2.499960 2.499950 20 2.499940 10 2.499930 2.499920 0 1 10 100 1k 10k 2.5 100k 3 3.5 4 4.5 5 5.5 6 Supply (V) Frequency (Hz) OUTPUT VOLTAGE vs SUPPLY VOLTAGE (ILOAD = 25mA) OUTPUT VOLTAGE vs LOAD CURRENT 2.500200 2.500010 2.500100 2.500000 2.500000 2.499990 Output Voltage (V) Output Voltage (V) 1k Frequency (Hz) Temperature (°C) 2.499900 2.499800 2.499700 2.499600 2.499500 2.499980 2.499970 2.499960 2.499950 2.499940 2.499400 2.499930 2.499300 2.5 3 3.5 4 4.5 5 5.5 0 6 REF3012, 3020, 3025, 3030, 3033, 3040 SBVS032E 5 10 15 20 25 30 Load Current (mA) Supply (V) 5 www.ti.com TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VIN = +5V power supply, REF3025 is used for typical characteristics, unless otherwise noted. 5V/div VOUT STEP RESPONSE, CL = 0, 5V STARTUP VIN 1V/div 3V/div VIN 1V/div STEP RESPONSE, CL = 0, 3V STARTUP VOUT 40µs/div 10µs/div LINE TRANSIENT RESPONSE 0-1mA LOAD TRANSIENT (CL = 0) VIN IL = 0mA 20mV/div 50mV/div 500mV/div IL = 1mA VOUT VOUT 10µs/div 10µs/div 0-5mA LOAD TRANSIENT (CL = 0) 1-6mA LOAD TRANSIENT (CL =1µF) IL = 5mA IL = 6mA 20mV/div 20mV/div IL = 0mA VOUT 10µs/div 6 IL = 0mA VOUT 40µs/div REF3012, 3020, 3025, 3030, 3033, 3040 www.ti.com SBVS032E TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VIN = +5V power supply, REF3025 is used for typical characteristics, unless otherwise noted. 1-25mA LOAD TRANSIENT (CL = 1µF) 0.1Hz TO 10Hz NOISE IL = 25mA 10µV/div 20mV/div IL = 1mA VOUT 1.0s/div 100µs/div LONG-TERM STABILITY 1000 TO 2000 HOURS LONG-TERM STABILITY 0 TO 1000 HOURS 80 Absolute Output Voltage Drift (ppm) Absolute Output Voltage Drift (ppm) 80 70 60 50 40 30 20 10 100 200 300 400 500 600 700 800 60 50 40 30 20 10 0 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 0 0 70 900 1000 Time (hours) Time (hours) LONG-TERM STABILITY 0 TO 2000 HOURS Absolute Output Voltage Drift (ppm) 80 70 60 50 40 30 20 10 0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 Time (hours) REF3012, 3020, 3025, 3030, 3033, 3040 SBVS032E 7 www.ti.com THEORY OF OPERATION The REF30xx is a series, CMOS, precision bandgap voltage reference. Its basic topology is shown in Figure 1. The transistors Q1 and Q2 are biased such that the current density of Q1 is greater than that of Q2. The difference of the two base-emitter voltages, Vbe1 – Vbe2, has a positive temperature coefficient and is forced across resistor R1. This voltage is gained up and added to the base-emitter voltage of Q2, which has a negative coefficient. The resulting output voltage is virtually independent of temperature. The curvature of the bandgap voltage, as seen in the typical curve, “Output Voltage vs Temperature,” is due to the slightly nonlinear temperature coefficient of the base-emitter voltage of Q2. The REF30xx features a low quiescent current, which is extremely stable over changes in both temperature and supply. The typical room temperature quiescent current is 42µA, and the maximum quiescent current over temperature is just 59µA. Additionally, the quiescent current typically changes less than 2.5µA over the entire supply range, as shown in Figure 3. Supply voltages below the specified levels can cause the REF30xx to momentarily draw currents greater than the typical quiescent current. Using a power supply with a fast rising edge and low output impedance easily prevents this. SUPPLY CURRENT vs INPUT VOLTAGE 42.5 IQ (µA) 42.0 41.5 41.0 R1 + + Vbe1 Vbe2 – 40.5 – Q1 Q2 40.0 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 VIN (V) FIGURE 3. Supply Current vs Supply Voltage. FIGURE 1. Simplified Schematic of Bandgap Reference. THERMAL HYSTERESIS APPLICATION INFORMATION The REF30xx does not require a load capacitor, and is stable with any capacitive load. Figure 2 shows typical connections required for operation of the REF30xx. A supply bypass capacitor of 0.47µF is recommended. Thermal hysteresis for the REF30xx is defined as the change in output voltage after operating the device at 25°C, cycling the device through the specified temperature range, and returning to 25°C, and can be expressed as: abs VPRE – VPOST 6 VHYST = • 10 (ppm) VNOM Where: VHYST = Calculated hysteresis VIN VPRE = Output voltage measured at 25°C pretemperature cycling 1 0.47µF VOUT REF30xx 3 VPOST = Output voltage measured when device has been operated at 25°C, cycled through specified range –40°C to +125°C and returned to operation at 25°C. 2 FIGURE 2. Typical Connections for Operating REF30xx. SUPPLY VOLTAGE The REF30xx family of references features an extremely low dropout voltage. With the exception of the REF3012, which has a minimum supply requirement of 1.8V, the REF30xx can be operated with a supply of only 1mV above the output voltage in an unloaded condition. For loaded conditions, a typical dropout voltage versus load is shown on the cover page. 8 TEMPERATURE DRIFT The REF30xx is designed to exhibit minimal drift error, defined as the change in output voltage over varying temperature. Using the “box” method of drift measurement, the REF30xx features a typical drift coefficient of 20ppm from 0°C to 70°C— the primary temperature range of use for many applications. For industrial temperature ranges of –40°C to 125°C, the REF30xx family drift increases to a typical value of 50ppm. REF3012, 3020, 3025, 3030, 3033, 3040 www.ti.com SBVS032E NOISE PERFORMANCE The REF30xx generates noise less than 50µVp-p between frequencies of 0.1Hz to 10Hz, and can be seen in the Typical Characteristic Curve “0.1 to 10Hz Voltage Noise.” The noise voltage of the REF30xx increases with output voltage and operating temperature. Additional filtering may be used to improve output noise levels, although care should be taken to ensure the output impedance does not degrade AC performance. APPLICATION CIRCUITS Negative Reference Voltage For applications requiring a negative and positive reference voltage, the OPA703 and REF30xx can be used to provide a dual supply reference from a ±5V supply. Figure 5 shows the REF3025 used to provide a ±2.5V supply reference voltage. The low offset voltage and low drift of the OPA703 complement the low drift performance of the REF30xx to provide an accurate solution for split-supply applications. LONG TERM STABILITY Long term stability refers to the change of the output voltage of a reference over a period of months or years. This effect lessens as time progresses as is apparent by the long term stability curves. The typical drift value for the REF30xx is 24ppm from 0-1000 hours, and 15ppm from 1000-2000 hours. This parameter is characterized by measuring 30 units at regular intervals for a period of 2000 hours. +5V +2.5V REF3025 10kΩ 10kΩ LOAD REGULATION +5V Load regulation is defined as the change in output voltage due to changes in load current. Load regulation for the REF30xx is measured using force and sense contacts as pictured in Figure 4. The force and sense lines tied to the contact area of the output pin reduce the impact of contact and trace resistance, resulting in accurate measurement of the load regulation contributed solely by the REF30xx. For applications requiring improved load regulation, force and sense lines should be used. OPA703 –2.5V –5V FIGURE 5. REF3025 Combined with OPA703 to Create Positive and Negative Reference Voltages. DATA ACQUISITION Output Pin Contact and Trace Resistance + VOUT – Often data acquisition systems require stable voltage references to maintain necessary accuracy. The REF30xx family features stability and a wide range of voltages suitable for most micro-controllers and data converters. Figure 6 and Figure 7 show two basic data acquisition systems. IL Sense Line Force Line Load Meter FIGURE 4. Accurate Load Regulation of REF30xx. REF3012, 3020, 3025, 3030, 3033, 3040 SBVS032E 9 www.ti.com 3.3V REF3033 V+ GND 5Ω + 1µF to 10µF ADS7822 VREF VCC 0.1µF VIN +In CS –In DOUT GND VS + 1µF to 10µF Microcontroller DCLOCK FIGURE 6. Basic Data Acquisition System 1. 2.5V Supply 5Ω 2.5V + VIN REF3012 1µF to 10µF ADS8324 VOUT 1.25V VREF VS VCC + 0.1µF 1µF to 10µF GND 0V to 1.25V +In CS –In DOUT GND Microcontroller DCLOCK FIGURE 7. Basic Data Acquisition System 2. 10 REF3012, 3020, 3025, 3030, 3033, 3040 www.ti.com SBVS032E PACKAGE OPTION ADDENDUM www.ti.com 24-Mar-2004 PACKAGING INFORMATION ORDERABLE DEVICE STATUS(1) PACKAGE TYPE PACKAGE DRAWING PINS PACKAGE QTY REF3012AIDBZR ACTIVE SOP DBZ 3 3000 REF3012AIDBZT ACTIVE SOP DBZ 3 250 REF3020AIDBZR ACTIVE SOP DBZ 3 3000 REF3020AIDBZT ACTIVE SOP DBZ 3 250 REF3025AIDBZR ACTIVE SOP DBZ 3 3000 REF3025AIDBZT ACTIVE SOP DBZ 3 250 REF3030AIDBZR ACTIVE SOP DBZ 3 3000 REF3030AIDBZT ACTIVE SOP DBZ 3 250 REF3033AIDBZR ACTIVE SOP DBZ 3 3000 REF3033AIDBZT ACTIVE SOP DBZ 3 250 REF3040AIDBZR ACTIVE SOP DBZ 3 3000 REF3040AIDBZT ACTIVE SOP DBZ 3 250 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. MECHANICAL DATA MPDS108 – AUGUST 2001 DBZ (R-PDSO-G3) PLASTIC SMALL-OUTLINE 3,04 2,80 2,05 1,78 0,60 0,45 1,03 0,89 1,40 1,20 2,64 2,10 0,51 0,37 1,12 0,89 0,100 0,013 0,55 REF 0,180 0,085 4203227/A 08/01 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Dimensions are inclusive of plating. Dimensions are exclusive of mold flash and metal burr. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 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. 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