LINER LM185-1.2 Micropower voltage reference Datasheet

LM185-1.2/
LM285-1.2/LM385-1.2
Micropower Voltage
Reference
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FEATURES
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■
■
■
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.
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APPLICATIO S
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■
■
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Portable Meter References
Portable Test Instruments
Battery Operated Systems
Current Loop Instrumentation
, LTC and LT are registered trademarks of Linear Technology Corporation.
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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
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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
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W
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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
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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
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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
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LM185-1.2/
LM285-1.2/LM385-1.2
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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
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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.
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LM185-1.2/
LM285-1.2/LM385-1.2
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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
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