LM385-2.5/LM385B-2.5
Micropower Voltage Reference
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FEATURES
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DESCRIPTION
The LM385-2.5 is a micropower 2-terminal band-
gap voltage reference, which can operate in
a
20µA to 20mA current range, they feature excep-
tionally low dynamic impedance and good tem-
perature stability. On-chip trimming is used to
achieve tight voltage tolerance. Since the LM385-
2.5 bandgap reference uses only transistors and
resistors, low noise and good long-term stability
result.
Careful design of the LM385-2.5 has made the de-
vice exceptionally tolerant of capacitive loading,
making it easy to use in almost any reference ap-
plication. The wide dynamic operating range al-
lows for its use with widely varying supplies with
excellent regulation.
The extremely low power drain of the LM385-2.5
makes it useful for micropower circuitry. This volt-
age reference can be used to make portable me-
ters, regulators, or general purpose analog circui-
try with battery life approaching shelf life. Further,
the wide operating current allows it to replace
older references with a tighter tolerance.
Operating Current from 20µA to 20mA.
Low Temperature Coefficient.
1% and 2% Initial Tolerance.
Low Dynamic Impedance.
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APPLICATIONS
Portable, Battery-Powered Equipment.
Instrumentation.
Process Control.
Energy Management.
Product Testing.
Automotive.
Precision Audio Components.
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TYPICAL APPLICATION CIRCUIT
V
IN
R
S
2.5V
+
-
LM385-2.5
Precision 2.500V Voltage Reference
Analog Integrations Corporation
4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan
TEL: 886-3-5772500
FAX: 886-3-5772510
w ww.analog.com.tw
DS-385C-01 012102
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LM385-2.5/LM385B-2.5
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ORDERING INFORMATION
LM385X-2.5CXXX
PACKING TYPE
BG: BAG
TB: TUBE (for SO-8)
TR: TAPE & REEL
PACKAGE TYPE
S : SMALL OUTLINE
U: SOT-23
X: SOT-89
Z: TO-92
TOLERANCE
PIN CONFIGURATION
SO-8
TOP VIEW
NC
NC
NC
1
2
3
4
8 +
7
NC
6 NC
5 NC
-
Default: 2%
B: 1%
Example: LM385-2.5CSTR
à
2% version, in SO-8 Package & Taping &
Reel Packing Type
(CS is not available in BAG packing type.)
SOT-23
TOP VIEW
1: -
2: +
3: NC
1
2
3
SOT-89
TOP VIEW
1: NC
2: -
3: +
1
2
3
TO-92
TOP VIEW
1: NC
2: +
3: -
1
2
3
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ABSOLUTE MAXIMUM RATINGS
Reverse Current
....… .................… … … … … … ........................................................
30mA
Forward Current
… … … ....................................… .......… … … … ..............................10mA
.… … … … … … … … ............… … ......… … ........
0°C to 70°C
Operating Temperature Range.
Storage Temperature
Lead Temperature
TO-92 Package Soldering (10 seconds)
SO Package Vapor phase (60 seconds)
..................… … … … … … … … ...................
260°C
............… … … … … … ......… … ...................
215°C
.............................… … … … .....… … .........................
-65°C to 150°C
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TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
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LM385-2.5/LM385B-2.5
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ELECTRICAL CHARACTERISTICS
(T =25°C, unless otherwise specified.)
A
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Change with Current
TEST CONDITIONS
I
R
=100µA
20µA≤I
R
≤1mA
1mA≤I
R
≤20mA
LM385B-2.5
LM385-2.5
SYMBOL
V
R
∆V
R
∆V
R
Z
R
I
RMIN
MIN.
2.475
2.450
TYP.
2.500
2.500
MAX.
2.525
2.550
2
20
UNIT
V
mV
mV
Ω
Reverse Dynamic Impedance I
R
=100µA, f=20Hz
Minimum Operating Current
Wideband Noise (rms)
Average Temperature
Coefficient (Note)
Long Term Stability
Note :
I
R
=100µA,
10Hz≤ f
≤10KHz
I
R
=100µA
I
R
=100µA, T=1000Hrs,
T
A
=25°C
1
13
120
100
20
20
µA
µVrms
ppm/°C
ppm
e
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αV
R
∆V
R
/∆t
The average temperature coefficient is defined as the maximum deviation of reverse breakdown voltage
at all measured temperatures from T
MIN
to T
MAX
, divided by T
MAX
- T
MIN
. The measured temperatures are
0°C, 25°C, 50°C and 70°C.
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