LM385B [AIC]
Adjustable Micropower Voltage Reference; 可调微功耗电压参考
| 型号： | LM385B |
| 厂家： | 
ANALOG INTERGRATIONS CORPORATION |
| 描述： | Adjustable Micropower Voltage Reference |
| 文件： | 总7页 (文件大小：127K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LM385/LM385B
Adjustable Micropower Voltage Reference
FEATURES
DESCRIPTION
n
n
n
n
The LM385 is micropower 3-terminal adjustable
l Adjustable from 1.24V to 5.3V.
l Operating Current from 10mA 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 10mA to 20mA current
range. They feature exceptionally low dynamic
impedance and good temperature stability. On-
chip trimming is used to achieve tight voltage
tolerance. Since the LM385 band-gap reference
uses only transistors and resistors, low noise
and good longterm stability result.
APPLICATIONS
l Portable, Battery-Powered Equipment.
l Instrumentation.
Careful design of the LM385 has made the de-
vice tolerant of capacitive loading, making it
easy to use in almost any reference application.
The wide dynamic operating range allows its
use with widely varying supplies with excellent
regulation.
l Process Control.
l Energy Management.
l Product Testing.
l Automotive.
l Precision Audio Components.
TYPICAL APPLICATION
CIRCUIT
The extremely low power drain of the LM385
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
part.
V
IN
R
S
1.24V
I
R
+
LM385
FB
-
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
ORDERING INFORMATION
n
LM385X-CXXX
PIN CONFIGURATION
SOT-89
TOP VIEW
1: FB
2: -
PACKING TYPE
BG: BAG
TR: TAPE & REEL
TB: TUBE (for SO-8)
3: +
PACKAGE TYPE
X: SOT-89
1
2
3
Z: TO-92
S: SMALL OUTLINE
TO-92
TOP VIEW
1: FB
2: +
3: -
1
2
3
TOLERANCE
Default: 2%
B: 1%
SO-8
Example: LM385-CXTR
TOP VIEW
NC
à
2% version, in SOT-89 Package & Taping &
Reel Packing Type
+
1
2
3
4
8
7
6
5
NC
NC
NC
(CS is not available in BAG packing type.)
NC
FB
-
ABSOLUTE MAXIMUM RATINGS
Reverse Current ....…................................……………............................................ 30mA
n
n
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
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
2
LM385/LM385B
ELECTRICAL CHARACTERISTICS (TA=25°C, unless otherwise specified.)
n
SYMBOL
PARAMETER
Reverse Voltage
TEST CONDITIONS
MIN.
TYP. MAX.
UNIT
LM385B
1.228 1.240 1.252
1.215 1.240 1.265
IR=100mA
VR
V
LM385
IRMIN £IR £1mA
1mA£IR £20mA
0.2
5
1
Reverse Voltage Change with
Current
DVR
mV
15
7
11
55
VOUT=1.24V
VOUT=5.3V
Minimum Operating Current
Dynamic Output Impedance
IRMIN
mA
35
IR=100mA, f=100Hz
IAC=0.1IR, VOUT=1.24V,
VOUT=5.3V
ZR
0.4
1
W
Reference Voltage Change with
Output Voltage
2
8
5
mV
nA
IR=100mA
Feedback Current
IFB
20
IR=100mA, 10Hz<f<10KHz
VOUT=1.24V,
Output Wideband Noise
50
mVRMS
eN
170
VOUT=5.3V
Average Temperature
Coefficient (Note)
IR=100mA
a VR
100
20
ppm/°C
IR=100mA, T=1000Hrs,
TA=25°C±0.1°C
Long Term Stability
DVR/Dt
ppm
Note : 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.
TYPICAL PERFORMANCE CHARACTERISTICS
n
1.0
0.8
0.6
0.4
0.2
0
100
°
TA= 25 C
°
TA= -55 C
10
°
TA= -55 C
°
TA= 125 C
°
TA= 25 C
°
TA= 125 C
1
0.1
0.01
0.1
1
10
100
0
0.2
0.4
0.6
0.8
1
1.2
1.4
Forward Current (mA)
Reverse Voltage (V)
Fig. 1 Forward characteristics
Fig. 2 Reverse Characteristics
3
LM385/LM385B
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
n
5
1.27
1.25
1.23
1.21
m
IR=100 A
4
3
2
1
0
°
TA= 25 C
°
TA= -55 C
°
TA= 80 C
-50
0
50
100
125
0.01
0.1
1
10
100
°
Temperature ( C)
Fig. 3 Temperature Drift of 3 Representative Units
Reverse Current (mA)
Fig. 4 Reverse Characteristics
10
8
80
m
IR=100 A
60
40
20
0
6
REF
VOUT=V
4
VOUT=5.3V
2
0
-20
0
20
40
60
80
100
120
1
2
3
4
5
6
Output Voltage (V)
Fig. 5 Minimum Operating Current
°
Temperature ( C)
Fig. 6 Feedback Current
10K
5
R
m
OUT
=5.3V
I =100 A
V
4
3
Input
Output
50K
1K
VOUT
VOUT= VREF
2
+
120K
1
100
10
364K
0
10
0
Input
100
1K
10
10K
100K
-50
0
50
100
150
200
250
m
Time ( S)
Fig. 7 Response Time
Frequency (Hz)
Fig. 8 Output Noise Voltage (
nV / Hz
)
4
LM385/LM385B
n
BLOCK DIAGRAM
SYMBOL
n
+
+
1.2
+
FB
-
-
FB
m
7 A
-
PIN DESCRIPTIONS
n
PIN +
-
sinks current with a range from 20mA 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.
APPLICATION EXAMPLES
n
V
IN
VIN
R4
50mA<I<200mA
m
100 A<I<5mA
R3
VOUT
2.5V
VOUT
25V
R1
120K
FB
R1
+
+
FB
120K
LM385
LM385
-
-
2N2219
R2
2.4M
R2
120K
R3
1K
2N5115
Fig. 9 200mA Shunt Regulator
Fig. 10 25V Low Current Shunt Regulator
V
IN
R1
120K
+
R1
+
FB
-
FB
-
2N2905
2N3964
D1
R2
1M
R2
R3
120K
200
<-12V
LED ON
m
1 A<IOUT<100mA
IOUT=1.24V/R1
-5V
Fig. 11 Current Source
Fig. 12 Voltage Level Detector
5
LM385/LM385B
APPLICATION EXAMPLES (Continued)
n
n
R1
120K
D1
+
FB
-
R2
1M
R3
330
>-12V
LED ON
-5V
Fig. 13 Voltage Level Detector
PHYSICAL DIMENSIONS
l
SOT-89 (unit: mm)
A
D
SYMBOL
MIN
1.40
0.36
0.35
4.40
1.62
2.29
MAX
1.60
0.48
0.44
4.60
1.83
2.60
D1
A
B
C
C
D
D1
E
H
E
L
e
1.50 (TYP.)
3.00 (TYP.)
B
e
e1
H
L
e1
3.94
0.89
4.25
1.20
l
SOT-89 Marking
Part No.
LM385CX
LM385BCX
Marking
AI01
AIB01
6
LM385/LM385B
l
TO-92 (unit: mm)
SYMBOL
MIN
4.32
MAX
5.33
E
L
A
A
C
D
E
C
0.38 (TYP.)
e1
4.40
3.17
5.20
4.20
D
e1
L
1.27 (TYP.)
12.7
-
l 8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL
MIN
MAX
1.75
0.25
0.51
0.25
5.00
4.00
A
A1
B
1.35
0.10
0.33
0.19
4.80
3.80
H
E
C
D
E
e
e
1.27(TYP)
A
H
L
5.80
0.40
6.20
1.27
C
B
L
7
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