LM185-1.2

LM185-1.2/ LM285-1.2/LM385-1.2 Micropower Voltage Reference FEATURES s s s s DESCRIPTIO 10µA to 20mA Operating Range Guaranteed 1% Initial Voltage Tolerance Guaranteed 1Ω Dynamic Impedance Very Low Power Consumption APPLICATIO S s s s s Portable Meter References Portable Test Instruments Battery Operated Systems Current Loop Instrumentation The LM185-1.2 is a two terminal band gap reference diode that has been designed for applications which require precision performance with micropower operation. The device provides guaranteed operating specifications at currents as low as 10µA. The nominal voltage is 1.235V with both 1% and 2% tolerances available. Some additional features are: maximum dynamic impedance of 1Ω, low noise and excellent stability over time and temperature. Advanced design, processing and testing techniques make Linear’s LM185-1.2 a superior choice over previous designs. A micropower 5V reference application is shown below. For guaranteed TC, micropower references, see the LT1034 data sheet. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Micropower 5V Reference VIN 7V TO 15V OUTPUT VOLTAGE CHANGE (mV) Reverse Voltage Change with Current 10 8 6 4 2 0 –2 0.01 TA = 25°C V+ LM334 V– R 5.6k 3 + – 7 LT1494 6 5V 150pF 3.01M 1% LM385-1.2 1M 1% 2 4 185/285/385 TA01a U 0.1 1 10 REVERSE CURRENT (mA) 100 185/285/385 TA01b U U 1 LM185-1.2/ LM285-1.2/LM385-1.2 ABSOLUTE AXI U RATI GS Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C Reverse Breakdown Current ................................. 30mA Forward Current ................................................... 10mA Operating Temperature Range LM185-1.2(OBSOLETE) ............... –55°C to 125°C LM285-1.2 ..........................................–40°C to 85°C LM385-1.2 .............................................. 0°C to 70°C PACKAGE/ORDER I FOR ATIO BOTTOM VIEW ORDER PART NUMBER LM185H-1.2 LM285H-1.2 LM385H-1.2 LM385BH-1.2 1 2 H PACKAGE 2-LEAD TO-46 METAL CAN TJMAX = 150°C, θJA = 440°C/W, θJC = 80°C/W (NOTE 3) OBSOLETE PACKAGE Consider the S8 or Z Packages for Alternate Source TOP VIEW NC 1 NC 2 NC 3 4 8 7 NC 6 5 NC (DO S8 PACKAGE NOT USE) 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 190°C/W Consult LTC Marketing for parts specified with wider operating temperature ranges. 2 U U W WW U W BOTTOM VIEW ORDER PART NUMBER LM285Z-1.2 LM385Z-1.2 LM385BZ-1.2 Z PACKAGE 3-LEAD PLASTIC TO-92 TJMAX = 150°C, θJA = 160°C/W (NOTE 3) ORDER PART NUMBER LM385BS8-1.2 LM385S8-1.2 S8 PART MARKING 3851 3851B LM185-1.2/ LM285-1.2/LM385-1.2 The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. For the LM185-1.2 TMIN = – 55°C and TMAX = 125°C. For LM285-1.2 TMIN = – 40°C and TMAX = 85°C.For LM385-1.2 TMIN = 0°C and TMAX = 70°C. For MIL-STD components, please refer to LTC883C data sheet for test listing and parameters. SYMBOL VZ PARAMETER Reverse Breakdown Voltage CONDITIONS TA = 25°C, IMIN ≤ IR ≤ 20mA LM185-1.2 LM385-1.2 LM385B-1.2 (Note 3) IMIN ≤ IR ≤ 20mA (Notes 2, 3) TMIN ≤ TA ≤ TMAX IMIN ≤ IR ≤ 1mA TA = 25°C TMIN ≤ TA ≤ TMAX 1mA ≤ IR ≤ 20mA TA = 25°C TMIN ≤ TA ≤ TMAX rZ Reverse Dynamic Impedance IR = 100µA TA =25°C TMIN ≤ TA ≤ TMAX IR = 100µA, 10Hz ≤ f ≤ 10kHz IR = 100µA, TA = 25°C ± 0 .1 ° C q ELECTRICAL CHARACTERISTICS LM185-1.2/LM285-1.2 MIN TYP MAX 1.223 1.235 1.247 LM385-1.2/LM385B-1.2 MIN TYP MAX UNITS V V V ppm/°C 1.205 1.223 20 8 10 1 1.5 10 20 0.2 q 1.235 1.235 20 8 1.260 1.247 ∆VZ ∆Temp IMIN ∆VZ ∆ IR Average Temperature Coefficient Minimum Operating Current Reverse Breakdown Voltage Change with Current 15 1 1.5 10 25 µA mV mV mV mV Ω Ω µV ppm/kHr q q 0.6 1.5 0.4 60 20 1.0 1.5 en ∆VZ ∆Time Wideband Noise (RMS) Long Term Stability 60 20 Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Selected devices with guaranteed maximum temperature coefficient are available upon request. Note 3: For applications requiring low initial tolerance guaranteed over temperature consult the LT1004 data sheet. 3 LM185-1.2/ LM285-1.2/LM385-1.2 TYPICAL PERFOR A CE CHARACTERISTICS Reverse Characteristics 100 –55°C TO 125°C 1.2 REVERSE CURRENT (µA) FORWARD VOLTAGE (V) 10 1 0.1 0 0.2 Temperature Drift 1.245 DYNAMIC IMPEDANCE (Ω) 1.240 10 DYNAMIC IMPEDANCE (Ω) REVERSE VOLTAGE (V) 1.235 1.230 –55 –35 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) 185/285/385 G03 Noise Voltage 700 600 INTEGRATED NOISE (µVRMS) IR = 100µA 500 NOISE (nV/√Hz) 400 300 200 100 0 10 R 40 C 30 20 10 0 100 VOLTAGE (V) 100 1k 10k FREQUENCY (Hz) 4 UW 100k 185/285/385 G06 Foward Characteristics TA = 25°C 0.8 0.4 0.4 0.6 0.8 1.0 REVERSE VOLTAGE (V) 1.2 1.4 0 0.01 1 10 0.1 FORWARD CURRENT (mA) 100 185/285/385 G02 185/285/385 G01 Reverse Dynamic Impedance 100 –55°C TO 125°C f = 25Hz 10k Reverse Dynamic Impedance TA = 25°C IR = 100µA 1k 100 10 1 1 0.1 0.01 1 10 0.1 REVERSE CURRENT (mA) 100 185/285/385 G04 0.1 10 100 10k 1k FREQUENCY (Hz) 100k 1M 185/285/385 G05 Filtered Output Noise 70 60 50 100µA IR = 100µA RC LOW PASS 2.0 1.5 1.0 0.5 0 5 Response Time OUTPUT VIN 36k VOUT INPUT 0 –5 –100 1k 10k CUTOFF FREQUENCY (Hz) 100k 185/285/385 G07 0 100 200 300 TIME (µs) 400 500 185/285/385 G08 LM185-1.2/ LM285-1.2/LM385-1.2 SCHE ATIC DIAGRA W + 7.5k Q4 Q12 200k Q3 20pF Q1 50k Q2 Q5 600k Q10 Q7 20pF Q11 Q13 300k Q9 Q6 500Ω Q8 Q14 60k W 100k – 185/285/385 SD 5 LM185-1.2/ LM285-1.2/LM385-1.2 PACKAGE DESCRIPTIO 0.209 – 0.219 (5.309 – 5.537) 0.178 – 0.195 (4.521 – 4.953) 0.500 (12.700) MIN * REFERENCE PLANE 0.016 – 0.021** (0.406 – 0.533) DIA 0.060 ± 0.005 (1.524± 0.127) DIA 0.180 ± 0.005 (4.572 ± 0.127) 0.500 (12.70) MIN 0.050 (1.27) BSC 10° NOM 6 U H Package 2-Lead and 3-Lead TO-46 Metal Can (Reference LTC DWG # 05-08-1340) 0.100 (2.540) TYP PIN 1 FOR 3-LEAD PACKAGE ONLY 45° 0.025 (0.635) MAX 0.036 – 0.046 (0.914 – 1.168) 0.028 – 0.048 (0.711 – 1.219) H02/03(TO-46) 1098 0.085 – 0.105 (2.159 – 2.667) 0.050 (1.270) TYP 0.050 (1.270) TYP *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND 0.045" BELOW THE REFERENCE PLANE 0.016 – 0.024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 – 0.610) OBSOLETE PACKAGE Z Package 3-Lead Plastic TO-92 (Similar to TO-226) (Reference LTC DWG # 05-08-1410) 0.180 ± 0.005 (4.572 ± 0.127) 0.90 (2.286) NOM 0.050 UNCONTROLLED (1.270) LEAD DIMENSION MAX 5° NOM 0.016 ± 0.003 (0.406 ± 0.076) 0.015 ± 0.002 (0.381 ± 0.051) 0.098 +016/–0.04 (2.5 +0.4/–0.1) 2 PLCS Z3 (TO-92) 0401 0.060 ± 0.010 (1.524 ± 0.254) 0.140 ± 0.010 (3.556 ± 0.127) TO-92 TAPE AND REEL REFER TO TAPE AND REEL SECTION OF LTC DATA BOOK FOR ADDITIONAL INFORMATION LM185-1.2/ LM285-1.2/LM385-1.2 PACKAGE DESCRIPTIO 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0°– 8° TYP 0.014 – 0.019 (0.355 – 0.483) TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 0.016 – 0.050 (0.406 – 1.270) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 0.189 – 0.197* (4.801 – 5.004) 8 7 6 5 0.228 – 0.244 (5.791 – 6.197) 0.150 – 0.157** (3.810 – 3.988) SO8 1298 1 2 3 4 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC 7 LM185-1.2/ LM285-1.2/LM385-1.2 TYPICAL APPLICATIO S U Micropower Reference for 9V Battery 1.2V Reference from 1.5V Battery 9V 510k 1.23V LM385-1.2 185/285/385 TA02 1.5V 3k 1.23V LM385-1.2 185/285/385 TA03 RELATED PARTS PART NUMBER LT1004-1.2 LT1034 DESCRIPTION Micropower Shunt Reference 1.2V Micropower Shunt Reference COMMENTS 0.3% Initial Accuracy 40ppm/°C Max Temperature Coefficient 8 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 q FAX: (408) 434-0507 q 18512fa LT/CP 0901 1.5K REV A • PRINTED IN USA www.linear.com © LINEAR TECHNOLOGY CORPORATION 1985