LM185-1.2/ LM285-1.2/LM385-1.2 Micropower Voltage Reference U FEATURES ■ ■ ■ ■ DESCRIPTIO 10µA to 20mA Operating Range Guaranteed 1% Initial Voltage Tolerance Guaranteed 1Ω Dynamic Impedance Very Low Power Consumption 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. U APPLICATIO S ■ ■ ■ ■ Portable Meter References Portable Test Instruments Battery Operated Systems Current Loop Instrumentation , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATIO Reverse Voltage Change with Current Micropower 5V Reference VIN 7V TO 15V 10 R LM334 V– 5.6k 3 + 7 LT1494 2 LM385-1.2 1M 1% – 4 6 5V 150pF 3.01M 1% 185/285/385 TA01a OUTPUT VOLTAGE CHANGE (mV) V+ TA = 25°C 8 6 4 2 0 –2 0.01 0.1 1 10 REVERSE CURRENT (mA) 100 185/285/385 TA01b 1 LM185-1.2/ LM285-1.2/LM385-1.2 W W U W ABSOLUTE AXI U RATI GS 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 Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C Reverse Breakdown Current ................................. 30mA Forward Current ................................................... 10mA U W U PACKAGE/ORDER I FOR ATIO BOTTOM VIEW 1 2 H PACKAGE 2-LEAD TO-46 METAL CAN TJMAX = 150°C, θJA = 440°C/W, θJC = 80°C/W (NOTE 3) ORDER PART NUMBER BOTTOM VIEW LM185H-1.2 LM285H-1.2 LM385H-1.2 LM385BH-1.2 Z PACKAGE 3-LEAD PLASTIC TO-92 ORDER PART NUMBER LM285Z-1.2 LM385Z-1.2 LM385BZ-1.2 TJMAX = 150°C, θJA = 160°C/W (NOTE 3) OBSOLETE PACKAGE Consider the S8 or Z Packages for Alternate Source ORDER PART NUMBER TOP VIEW NC 1 8 NC 2 7 NC NC 3 6 4 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 LM385BS8-1.2 LM385S8-1.2 S8 PART MARKING 3851 3851B LM185-1.2/ LM285-1.2/LM385-1.2 ELECTRICAL CHARACTERISTICS The ● 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 ∆VZ ∆Temp PARAMETER CONDITIONS Reverse Breakdown Voltage TA = 25°C, IMIN ≤ IR ≤ 20mA LM185-1.2 LM385-1.2 LM385B-1.2 (Note 3) LM185-1.2/LM285-1.2 MIN TYP MAX 1.223 IMIN ≤ IR ≤ 20mA (Notes 2, 3) IMIN Minimum Operating Current TMIN␣ ≤␣ TA ≤␣ TMAX ● ∆VZ ∆IR Reverse Breakdown Voltage Change with Current IMIN ≤ IR ≤ 1mA TA = 25°C TMIN ≤ TA ≤ TMAX ● 1mA ≤ IR ≤ 20mA TA = 25°C TMIN ≤ TA ≤ TMAX ● IR = 100µA TA =25°C TMIN ≤ TA ≤ TMAX ● en ∆VZ ∆Time Reverse Dynamic Impedance 20 8 0.2 UNITS 1.247 1.205 1.223 Average Temperature Coefficient rZ 1.235 LM385-1.2/LM385B-1.2 MIN TYP MAX 1.235 1.235 V V V 1.260 1.247 20 ppm/°C 15 µA 1 1.5 1 1.5 mV mV 10 20 10 25 mV mV 1.0 1.5 Ω Ω 10 0.6 1.5 8 0.4 Wideband Noise (RMS) IR = 100µA, 10Hz ≤ f ≤ 10kHz 60 60 µV Long Term Stability IR = 100µA, TA = 25°C ± 0.1°C 20 20 ppm/kHr 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 U W TYPICAL PERFOR A CE CHARACTERISTICS Foward Characteristics Reverse Characteristics 1.2 100 FORWARD VOLTAGE (V) REVERSE CURRENT (µA) –55°C TO 125°C 10 1 0.1 0 0.4 0.6 0.8 1.0 REVERSE VOLTAGE (V) 0.2 1.2 TA = 25°C 0.8 0.4 0 0.01 1.4 1 10 0.1 FORWARD CURRENT (mA) 185/285/385 G02 185/285/385 G01 Temperature Drift 1.235 10 1 0.1 0.01 5 25 45 65 85 105 125 TEMPERATURE (°C) 10k –55°C TO 125°C f = 25Hz DYNAMIC IMPEDANCE (Ω) DYNAMIC IMPEDANCE (Ω) REVERSE VOLTAGE (V) 1.240 1.230 –55 –35 –15 Reverse Dynamic Impedance Reverse Dynamic Impedance 100 1.245 100 1 10 0.1 REVERSE CURRENT (mA) TA = 25°C IR = 100µA 1k 100 10 1 0.1 100 10 100 10k 1k FREQUENCY (Hz) 185/285/385 G04 Noise Voltage INTEGRATED NOISE (µVRMS) NOISE (nV/√Hz) IR = 100µA 400 300 200 100 100 1k 10k FREQUENCY (Hz) 100k 185/285/385 G06 50 1.5 RC LOW PASS 60 500 4 2.0 100µA OUTPUT 1.0 VOLTAGE (V) IR = 100µA 600 0 10 Response Time Filtered Output Noise 70 1M 185/285/385 G05 185/285/385 G03 700 100k R 40 C 30 0.5 VIN 36k VOUT 0 20 5 10 0 INPUT 0 100 1k 10k CUTOFF FREQUENCY (Hz) 100k 185/285/385 G07 –5 –100 0 100 200 300 TIME (µs) 400 500 185/285/385 G08 LM185-1.2/ LM285-1.2/LM385-1.2 W W SCHE ATIC DIAGRA + 7.5k Q13 Q4 Q12 200k Q3 Q7 20pF 20pF Q11 Q1 50k Q2 Q10 600k Q5 300k Q9 Q6 100k 500Ω Q8 Q14 60k – 185/285/385 SD 5 LM185-1.2/ LM285-1.2/LM385-1.2 U PACKAGE DESCRIPTIO H Package 2-Lead and 3-Lead TO-46 Metal Can (Reference LTC DWG # 05-08-1340) 0.209 – 0.219 (5.309 – 5.537) 0.178 – 0.195 (4.521 – 4.953) REFERENCE PLANE 0.100 (2.540) TYP 0.050 (1.270) TYP 0.085 – 0.105 (2.159 – 2.667) 0.050 (1.270) TYP PIN 1 0.500 (12.700) MIN FOR 3-LEAD PACKAGE ONLY 45° * 0.036 – 0.046 (0.914 – 1.168) 0.025 (0.635) MAX 0.028 – 0.048 (0.711 – 1.219) H02/03(TO-46) 1098 0.016 – 0.021** (0.406 – 0.533) DIA *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) 0.060 ± 0.005 (1.524± 0.127) DIA 0.90 (2.286) NOM 0.180 ± 0.005 (4.572 ± 0.127) 0.500 (12.70) MIN 0.050 UNCONTROLLED (1.270) LEAD DIMENSION MAX 0.016 ± 0.003 (0.406 ± 0.076) 0.050 (1.27) BSC 0.060 ± 0.010 (1.524 ± 0.254) 0.140 ± 0.010 (3.556 ± 0.127) 10° NOM 6 5° NOM 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 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 U PACKAGE DESCRIPTIO 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 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) SO8 1298 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.053 – 0.069 (1.346 – 1.752) 0°– 8° TYP 0.016 – 0.050 (0.406 – 1.270) 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 2 3 4 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC 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. 7 LM185-1.2/ LM285-1.2/LM385-1.2 U TYPICAL APPLICATIO S 1.2V Reference from 1.5V Battery Micropower Reference for 9V Battery 9V 1.5V 510k 3k 1.23V 1.23V LM385-1.2 LM385-1.2 185/285/385 TA02 185/285/385 TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1004-1.2 Micropower Shunt Reference 0.3% Initial Accuracy LT1034 1.2V Micropower Shunt Reference 40ppm/°C Max Temperature Coefficient 8 Linear Technology Corporation 18512fa LT/CP 0901 1.5K REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 1985