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Linear Technology Electronic Components Datasheet


LM185-1.2

Micropower Voltage Reference



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LM185-1.2 pdf
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



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LM185-1.2 pdf
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



Part Number LM185-1.2
Description Micropower Voltage Reference
Maker Linear - Linear
Total Page 8 Pages
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