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LM385-1.2 Datasheet
Micropower Voltage Reference

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FEATURES
s 10µA to 20mA Operating Range
s Guaranteed 1% Initial Voltage Tolerance
s Guaranteed 1Dynamic Impedance
s Very Low Power Consumption
U
APPLICATIO S
s Portable Meter References
s Portable Test Instruments
s Battery Operated Systems
s Current Loop Instrumentation
TYPICAL APPLICATIO
LM185-1.2/
LM285-1.2/LM385-1.2
Micropower Voltage
Reference
DESCRIPTIO
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 addi-
tional features are: maximum dynamic impedance of 1,
low noise and excellent stability over time and tempera-
ture. 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.
Micropower 5V Reference
V+
LM334
V
LM385-1.2
VIN
7V TO 15V
R
5.6k
1M
1%
3+ 7
LT1494
2
4
6
5V
150pF
3.01M
1%
185/285/385 TA01a
Reverse Voltage Change with Current
10
TA = 25°C
8
6
4
2
0
–2
0.01
0.1 1
10
REVERSE CURRENT (mA)
100
185/285/385 TA01b
1


LM385-1.2 Datasheet
Micropower Voltage Reference

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LM185-1.2/
LM285-1.2/LM385-1.2
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
UW U
PACKAGE/ORDER I FOR ATIO
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Reverse Breakdown Current ................................. 30mA
Forward Current ................................................... 10mA
BOTTOM VIEW
ORDER PART
NUMBER
12
LM185H-1.2
LM285H-1.2
H PACKAGE
2-LEAD TO-46 METAL CAN
LM385H-1.2
LM385BH-1.2
TJMAX = 150°C,
θJA = 440°C/W, θJC = 80°C/W
(NOTE 3)
OBSOLETE PACKAGE
Consider the S8 or Z Packages for Alternate Source
BOTTOM VIEW
Z PACKAGE
3-LEAD PLASTIC TO-92
TJMAX = 150°C, θJA = 160°C/W
(NOTE 3)
TOP VIEW
NC 1
8
NC 2
NC 3
7 NC
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.
ORDER PART
NUMBER
LM285Z-1.2
LM385Z-1.2
LM385BZ-1.2
ORDER PART
NUMBER
LM385BS8-1.2
LM385S8-1.2
S8 PART
MARKING
3851
3851B
2


LM385-1.2 Datasheet
Micropower Voltage Reference

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LM185-1.2/
LM285-1.2/LM385-1.2
ELECTRICAL CHARACTERISTICS 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
VZ
Temp
IMIN
VZ
IR
rZ
en
VZ
Time
PARAMETER
Reverse Breakdown Voltage
Average Temperature Coefficient
Minimum Operating Current
Reverse Breakdown Voltage
Change with Current
Reverse Dynamic Impedance
Wideband Noise (RMS)
Long Term Stability
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
IR = 100µA
TA =25°C
TMIN TA TMAX
IR = 100µA, 10Hz f 10kHz
IR = 100µA, TA = 25°C ± 0.1°C
LM185-1.2/LM285-1.2 LM385-1.2/LM385B-1.2
MIN TYP MAX MIN TYP
MAX
UNITS
1.223 1.235
20
1.247
1.205
1.223
1.235
1.235
20
1.260
1.247
V
V
V
ppm/°C
q 8 10
8 15
µA
1
q 1.5
1 mV
1.5 mV
10
q 20
10 mV
25 mV
0.2 0.6
q 1.5
60
20
0.4 1.0
1.5
60 µV
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


LM385-1.2 Datasheet
Micropower Voltage Reference

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LM185-1.2/
LM285-1.2/LM385-1.2
TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Characteristics
100
–55°C TO 125°C
Foward Characteristics
1.2
TA = 25°C
10 0.8
1 0.4
0.1
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
REVERSE VOLTAGE (V)
185/285/385 G01
0
0.01
Temperature Drift
1.245
Reverse Dynamic Impedance
100
–55°C TO 125°C
f = 25Hz
1.240
10
0.1 1
10
FORWARD CURRENT (mA)
100
185/285/385 G02
Reverse Dynamic Impedance
10k
TA = 25°C
IR = 100µA
1k
100
1.235
10
1
1
1.230
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
185/285/385 G03
Noise Voltage
700
IR = 100µA
600
500
400
300
200
100
0
10 100 1k
10k 100k
FREQUENCY (Hz)
185/285/385 G06
0.1
0.01
0.1 1
10
REVERSE CURRENT (mA)
100
185/285/385 G04
Filtered Output Noise
70
IR = 100µA
60
RC LOW PASS
50 100µA
R
40
C
30
20
10
0
100
1k 10k
CUTOFF FREQUENCY (Hz)
100k
185/285/385 G07
0.1
10
100 1k 10k 100k
FREQUENCY (Hz)
1M
185/285/385 G05
Response Time
2.0
1.5 OUTPUT
1.0
0.5
36k
VIN
VOUT
0
5
INPUT
0
–5
–100 0
100 200 300
TIME (µs)
400 500
185/285/385 G08
4


LM385-1.2 Datasheet
Micropower Voltage Reference

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SCHE ATIC DIAGRA
LM185-1.2/
LM285-1.2/LM385-1.2
7.5k Q13
Q4
Q12
Q3 Q7
20pF
20pF
Q11
Q1
Q2 Q5
600k
Q10
+
200k
50k
300k
Q9
Q6 Q8
100k
500
60k
Q14
185/285/385 SD
5


LM385-1.2 datasheets pdf
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