AIC LM385BZTR Adjustable micropower voltage reference Datasheet

LM385/LM385B
Adjustable Micropower Voltage Reference
n FEATURES
n DESCRIPTION
The LM385 is micropower 3-terminal adjustable
l
Adjustable from 1.24V to 5.3V.
l
Operating Current from 10µA to 20mA.
l
Low Temperature Coefficient.
l
1% and 2% Initial Tolerance.
l
Low Dynamic Impedance.
band-gap voltage reference. Operating from
1.24V to 5.3V and over 10µA to 20mA current
range. They feature exceptionally low dynamic
impedance and good temperature stability. Onchip trimming is used to achieve tight voltage
tolerance. Since the LM385 band-gap reference
n APPLICATIONS
uses only transistors and resistors, low noise
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Portable, Battery-Powered Equipment.
and good longterm stability result.
l
Instrumentation.
Careful design of the LM385 has made the de-
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Process Control.
vice tolerant of capacitive loading, making it
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Energy Management.
easy to use in almost any reference application.
l
Product Testing.
The wide dynamic operating range allows its
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Automotive.
use with widely varying supplies with excellent
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Precision Audio Components.
regulation.
n TYPICAL APPLICATION
CIRCUIT
The extremely low power drain of the LM385
makes it useful for micropower circuitry. This
V IN
voltage reference can be used to make portable
RS
meters, regulators or general purpose analog
1.24V
+
IR
-
FB
circuitry with battery life approaching shelf life.
Further, the wide operating current allows it to
replace older references with a tighter tolerance
LM385
part.
Precision 1.24V 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
www.analog.com.tw
DS-385B-01 012102
1
LM385/LM385B
n ORDERING INFORMATION
LM385X-CXXX
PIN CONFIGURATION
PACKING TYPE
BG: BAG
TR: TAPE & REEL
TB: TUBE (for SO-8)
SOT-89
TOP VIEW
1: FB
2: 3: +
PACKAGE TYPE
X: SOT-89
Z: TO-92
S: SMALL OUTLINE
1
2
3
TO-92
1
TOP VIEW
1: FB
2: +
3: -
TOLERANCE
Default: 2%
B: 1%
Example: LM385-CXTR
à 2% version, in SOT-89 Package & Taping &
Reel Packing Type
(CS is not available in BAG packing type.)
2
3
SO-8
TOP VIEW
NC
1
8
+
NC
2
7
NC
NC
3
6
NC
-
4
5
FB
n ABSOLUTE MAXIMUM RATINGS
Reverse Current ....… ................................… … … … … ............................................ 30mA
Forward Current … … … ....................................… ..… … … … .....................................10mA
Operating Temperature Range.
.… … … … … … … … .… … … ................… ........ 0°C to 70°C
Storage Temperature ...................................… … .… … … … ....................... -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/LM385B
n ELECTRICAL CHARACTERISTICS (T =25°C, unless otherwise specified.)
A
PARAMETER
SYMBOL MIN.
TEST CONDITIONS
Reverse Voltage
LM385B
IR=100µA
Reverse Voltage Change with
Current
VR
LM385
IRMIN ≤IR ≤1mA
∆VR
1mA≤IR ≤20mA
VOUT =1.24V
Minimum Operating Current
1.228
1.215
VOUT =5.3V
TYP.
MAX.
UNIT
1.240
1.240
1.252
1.265
V
0.2
1
5
15
7
11
IRMIN
35
55
ZR
0.4
mV
µA
IR=100µA, f=100Hz
Dynamic Output Impedance
IAC=0.1IR, VOUT =1.24V,
1
VOUT =5.3V
Reference Voltage Change with
Output Voltage
Ω
IR=100µA
Feedback Current
IFB
2
5
mV
8
20
nA
IR=100µA, 10Hz<f<10KHz
Output Wideband Noise
eN
VOUT =1.24V,
VOUT =5.3V
Average Temperature
IR=100µA
Coefficient (Note)
IR=100µA, T=1000Hrs,
Long Term Stability
Note :
µVRMS
50
170
TA=25°C±0.1°C
αVR
100
ppm/°C
∆VR/∆t
20
ppm
The average temperature coefficient is defined as the maximum deviation of reverse 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.
n TYPICAL PERFORMANCE CHARACTERISTICS
100
TA= 25° C
TA= -55° C
0.8
Reverse Current ( µA)
Forward Voltage (V)
1.0
TA= 125 °C
0.6
0.4
0.2
0
10
TA= -55 °C
TA= 25° C
TA= 125° C
1
0.1
0.01
0.1
1
10
Forward Current (mA)
Fig. 1 Forward characteristics
100
0
0.2
0.4
0.6
0.8
1
1.2
1.4
Reverse Voltage (V)
Fig. 2 Reverse Characteristics
3
LM385/LM385B
n TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
5
1.27
Output Voltage Change (mV)
Reference voltage (V)
IR =100µA
1.25
1.23
4
3
2
TA= 25° C
TA= 80° C
1.21
-50
0
50
100
TA= -55° C
1
0
125
0.01
0.1
Temperature (°C)
Fig. 3 Temperature Drift of 3 Representative Units
1
10
100
Reverse Current (mA)
Fig. 4 Reverse Characteristics
10
80
Feedback Current (nA)
Minimum Current (µA)
I R=100µA
60
40
20
0
8
1
2
3
4
5
6
VOUT=VREF
VOUT=5.3V
4
2
0
6
-20
0
20
40
60
80
100
120
Temperature ( °C)
Fig. 6 Feedback Current
Output Voltage (V)
Fig. 5 Minimum Operating Current
10K
5
I R=100µA
V OUT=5.3V
Input
Output
3
1K
50K
V OUT
2
+
1
V OUT= V REF
Noise
Voltage (V)
4
120K
-
100
364K
0
10
Input
10
0
-50
0
50
100
150
Time (µS)
Fig. 7 Response Time
200
250
10
100
1K
10K
100K
Frequency (Hz)
Fig. 8 Output Noise Voltage ( nV / Hz )
4
LM385/LM385B
n
n BLOCK DIAGRAM
SYMBOL
+
+
1.2
+
-
FB
FB
7µ A
-
-
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
V IN
R4
VIN
50µA<I<200mA
FB
+
R1
120K
R3
VOUT
2.5V
LM385 2N2219
R3
1K
+
LM385
R2
120K
Fig. 9 200mA Shunt Regulator
100 µA<I<5mA
FB
R1
120K
VOUT
25V
R2
2.4M
2N5115
Fig. 10 25V Low Current Shunt Regulator
V IN
+
R1
120K
R1
FB
+
FB
-
-
2N2905
D1
2N3964
R2
120K
R3
200
1 µA<IOUT <100mA
I OUT=1.24V/R1
Fig. 11 Current Source
R2
1M
<-12V
LED ON
-5V
Fig. 12 Voltage Level Detector
5
LM385/LM385B
n
APPLICATION EXAMPLES
D1
(Continued)
R1
120K
+
FB
R2
1M
R3
330
>-12V
LED ON
-5V
Fig. 13 Voltage Level Detector
n PHYSICAL DIMENSIONS
l
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
SOT-89 Marking
Part No.
Marking
LM385CX
AI01
LM385BCX
AIB01
6
LM385/LM385B
l
TO-92 (unit: mm)
E
L
A
SYMBOL
MIN
MAX
A
4.32
5.33
C
C
e1
D
0.38 (TYP.)
D
4.40
5.20
E
3.17
4.20
e1
1.27 (TYP.)
L
12.7
-
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
1.27(TYP)
H
5.80
6.20
L
0.40
1.27
L
7
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