AIC LM385B-2.5 Micropower voltage reference Datasheet

LM385-2.5/LM385B-2.5
Micropower Voltage Reference
n FEATURES
n DESCRIPTION
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Operating Current from 20µA to 20mA.
The LM385-2.5 is a micropower 2-terminal band-
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Low Temperature Coefficient.
gap voltage reference, which can operate in
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1% and 2% Initial Tolerance.
20µA to 20mA current range, they feature excep-
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Low Dynamic Impedance.
tionally low dynamic impedance and good tem-
n
a
perature stability. On-chip trimming is used to
APPLICATIONS
achieve tight voltage tolerance. Since the LM385-
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Portable, Battery-Powered Equipment.
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Instrumentation.
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Process Control.
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Energy Management.
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Product Testing.
Careful design of the LM385-2.5 has made the de-
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Automotive.
vice exceptionally tolerant of capacitive loading,
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Precision Audio Components.
making it easy to use in almost any reference ap-
2.5 bandgap reference uses only transistors and
resistors, low noise and good long-term stability
result.
plication. The wide dynamic operating range allows 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 voltage reference can be used to make portable meters, regulators, or general purpose analog circuitry with battery life approaching shelf life. Further,
the wide operating current allows it to replace
older references with a tighter tolerance.
n TYPICAL APPLICATION CIRCUIT
VIN
RS
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
1
LM385-2.5/LM385B-2.5
n ORDERING INFORMATION
LM385X-2.5CXXX
PIN CONFIGURATION
SO-8
TOP VIEW
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
NC
1
8 +
NC
2
7
NC
3
6 NC
-
4
5 NC
2
SOT-23
TOP VIEW
1: 2: +
3: NC
TOLERANCE
Default: 2%
B: 1%
1
Example: LM385-2.5CSTR
à 2% version, in SO-8 Package & Taping &
Reel Packing Type
(CS is not available in BAG packing type.)
NC
3
SOT-89
TOP VIEW
1: NC
2: 3: +
1
TO-92
TOP VIEW
1: NC
2: +
3: -
2
3
1
2
3
n ABSOLUTE MAXIMUM RATINGS
Reverse Current ....… .................… … … … … … ........................................................ 30mA
Forward Current
… … … ....................................… .......… … … … ..............................10mA
Operating Temperature Range.
Storage Temperature
.… … … … … … … … ............… … ......… … ........ 0°C to 70°C
.............................… … … … .....… … ......................... -65°C to 150°C
Lead Temperature
TO-92 Package Soldering (10 seconds)
..................… … … … … … … … ................... 260°C
SO Package Vapor phase (60 seconds)
............… … … … … … ......… … ................... 215°C
n TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
2
LM385-2.5/LM385B-2.5
n ELECTRICAL CHARACTERISTICS (T =25°C, unless otherwise specified.)
A
PARAMETER
Reverse Breakdown Voltage
Reverse Breakdown Voltage
Change with Current
TEST CONDITIONS
IR=100µA
LM385B-2.5
LM385-2.5
Coefficient (Note)
Long Term Stability
Note :
TYP.
MAX.
UNIT
VR
2.475
2.450
2.500
2.500
2.525
2.550
V
∆VR
2
mV
1mA≤IR ≤20mA
∆VR
20
mV
Minimum Operating Current
Average Temperature
MIN.
20µA≤IR ≤1mA
Reverse Dynamic Impedance IR=100µA, f=20Hz
Wideband Noise (rms)
SYMBOL
IR=100µA,
10Hz≤ f ≤10KHz
IR=100µA
IR=100µA, T=1000Hrs,
TA=25°C
Ω
ZR
1
IRMIN
13
eN
120
µVrms
αVR
100
ppm/°C
∆VR /∆t
20
ppm
20
µA
The average temperature coefficient is defined as the maximum deviation of reverse breakdown voltage
at all measured temperatures from TMIN to TMAX, divided by TMAX - TMIN. The measured temperatures are
0°C, 25°C, 50°C and 70°C.
3
LM385-2.5/LM385B-2.5
TYPICAL PERFORMANCE CHARACTERISTICS
3
Reverse Voltage (V)
Output Voltage Change (mV)
8
125 °C
2.5
-25°C
2
1.5
25°C
1
0.5
0
1
10
Reverse Current (µ A)
Fig. 1 Reverse Characteristics
4
0
0.1
1
10
100
Reverse Current (mA)
Fig. 2 Reverse Characteristics
2.5
1.2
2
1
25 °C
-25°C
0.6
125 °C
0.4
80 °C
2
1.4
0.8
-25°C
25 °C
6
-2
0.01
100
Voltage Swing (V)
Forward Voltage (V)
0.1
0.2
Input (2)
1.5
Output
100K
Output (1)
1
0.5
0
12.5
Input
0
0.01
0.1
1
10
100
0
200
400
600
800
1000
Time (µS)
Fig. 4 Response Time
Forward Current (mA)
Fig. 3 Forward Characteristics
2.52
1000
800
2.51
Noise
Reference Voltage (V)
n
2.5
600
400
2.49
200
2.48
-20
0
20
40
60
Temperature (°C)
Fig. 5 Temperature Drift
80
100
100
1000
1000
10000
Frequency (Hz)
Fig. 6 Noise Voltage (n V / Hz )
4
LM385-2.5/LM385B-2.5
n
n BLOCK DIAGRAM
SYMBOL
+
+
2.5V
+
13µA
-
-
n PIN DESCRIPTIONS
PIN +
- sinks current with a range from 20µA to 20mA for normal applications. And a stable positive voltage,
relative to Pin-, occurs on Pin+.
PIN -
- Pin- sources current for normal application. The current value is the same as Pin+.
PIN NC
- Not connected.
n APPLICATION EXAMPLES
LM385-2.5
LM385-2.5
C1
150pF
C1
150pF
R1
68K
2
3
IOUT
-
2 . 5V
R2
R1
68K
2
+
3 -
-1.5V to -27V
IOUT =
7
6
4
IOUT
4
R2
1.5V to 27V
IOUT =
+
30V
7
6
R2
-30V
2 . 5V
R2
Fig. 7 Precision 1µA to 1mA Current Source
5
LM385-2.5/LM385B-2.5
n PHYSICAL DIMENSIONS
l
8 LEAD PLASTIC SO (unit: mm)
D
H
E
e
SYMBOL
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
B
0.33
0.51
C
0.19
0.25
D
4.80
5.00
E
3.80
4.00
e
A
A1
C
B
l
H
5.80
6.20
L
0.40
1.27
SYMBOL
MIN
MAX
A
1.00
1.30
A1
—
0.10
A2
0.70
0.90
b
0.35
0.50
C
0.10
0.25
D
2.70
3.10
E
1.40
1.80
L
SOT-23 (unit: mm)
C
D
L
E
H
θ1
e
e
A
A2
A1
b
l
1.27(TYP)
1.90 (TYP)
H
2.60
3.00
L
0.37
—
θ1
1°
9°
SOT-23 MARKING
Part No.
LM385-25CU
LM385B-25CU
Marking
AIA2
AIB2
6
LM385-2.5/LM385B-2.5
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SOT-89 (unit: mm)
D
A
SYMBOL
MIN
MAX
C
A
1.40
1.60
B
0.36
0.48
C
0.35
0.44
D
4.40
4.60
D1
1.62
1.83
E
2.29
2.60
D1
H
E
L
B
e
e1
l
e
1.50 (TYP.)
e1
3.00 (TYP.)
H
3.94
4.25
L
0.89
1.20
SYMBOL
MIN
MAX
A
4.32
5.33
TO-92 (unit: mm)
A
E
L
C
C
e1
D
0.38 (TYP.)
D
4.40
5.20
E
3.17
4.20
e1
L
1.27 (TYP.)
12.7
-
7
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