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LM185-1.2/ LM285-1.2/LM385-1.2 Micropower Voltage Reference
FEATURES
s s s s
DESCRIPTIO
10A to 20mA Operating Range Guaranteed 1% Initial Voltage Tolerance Guaranteed 1 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 10A. The nominal voltage is 1.235V with both 1% and 2% tolerances available. Some additional features are: maximum dynamic impedance of 1, 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 = 25C
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 ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C Reverse Breakdown Current ................................. 30mA Forward Current ................................................... 10mA
Operating Temperature Range LM185-1.2(OBSOLETE) ............... -55C to 125C LM285-1.2 ..........................................-40C to 85C LM385-1.2 .............................................. 0C to 70C
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 = 150C, JA = 440C/W, JC = 80C/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 = 150C, JA = 190C/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 = 150C, JA = 160C/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 = 25C. For the LM185-1.2 TMIN = -55C and TMAX = 125C. For LM285-1.2 TMIN = -40C and TMAX = 85C.For LM385-1.2 TMIN = 0C and TMAX = 70C. For MIL-STD components, please refer to LTC883C data sheet for test listing and parameters.
SYMBOL VZ PARAMETER Reverse Breakdown Voltage CONDITIONS TA = 25C, 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 = 25C TMIN TA TMAX 1mA IR 20mA TA = 25C TMIN TA TMAX rZ Reverse Dynamic Impedance IR = 100A TA =25C TMIN TA TMAX IR = 100A, 10Hz f 10kHz IR = 100A, TA = 25C 0.1C
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
A mV mV mV mV V 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 -55C TO 125C 1.2
REVERSE CURRENT (A)
FORWARD VOLTAGE (V)
10
1
0.1
0
0.2
Temperature Drift
1.245
DYNAMIC IMPEDANCE ()
1.240
10
DYNAMIC IMPEDANCE ()
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 (VRMS)
IR = 100A
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 = 25C
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 -55C TO 125C f = 25Hz 10k
Reverse Dynamic Impedance
TA = 25C IR = 100A
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 100A 2.0 IR = 100A RC LOW PASS 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 (s)
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 Q8 Q14 500 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 x 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
(c) LINEAR TECHNOLOGY CORPORATION 1985

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