LM431CIM3X/NOPB [NSC]
IC 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO3, PLASTIC, SOT-23, 3 PIN, Voltage Reference;
| 型号： | LM431CIM3X/NOPB |
| 厂家： | 
National Semiconductor |
| 描述： | IC 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO3, PLASTIC, SOT-23, 3 PIN, Voltage Reference 光电二极管 输出元件 |
| 文件： | 总13页 (文件大小：862K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 2005
LM431
Adjustable Precision Zener Shunt Regulator
General Description
Features
n Average temperature coefficient 50 ppm/˚C
The LM431 is a 3-terminal adjustable shunt regulator with
guaranteed temperature stability over the entire temperature
range of operation. It is now available in a chip sized pack-
age (4-Bump micro SMD) using National’s micro SMD pack-
age technology. The output voltage may be set at any level
greater than 2.5V (VREF) up to 36V merely by selecting two
external resistors that act as a voltage divided network. Due
to the sharp turn-on characteristics this device is an excel-
lent replacement for many zener diode applications.
n Temperature compensated for operation over the full
temperature range
n Programmable output voltage
n Fast turn-on response
n Low output noise
n LM431 in micro SMD package
n See AN-1112 for micro SMD considerations
Connection Diagrams
TO-92: Plastic Package
SOT-23: 3-Lead Small Outline
01005528
Top View
01005501
Top View
4-Bump micro SMD
SO-8: 8-Pin Surface Mount
01005554
Top View
01005502
(bump side down)
Top view
Note: *NC = Not internally connected. Must be electrically isolated from the rest of the circuit for the microSMD package.
© 2005 National Semiconductor Corporation
DS010055
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Ordering Information
Package
Typical Accuracy Order Number/Package
Temperature
Range
Transport Media
NSC
Drawing
Marking
1%
0.5%
LM431CCZ/
LM431CCZ
LM431CIZ/
LM431CIZ
LM431CCM/
431CCM
2%
LM431ACZ/
LM431ACZ
LM431AIZ/
LM431AIZ
TO-92
LM431BCZ/
LM431BCZ
LM431BIZ/
LM431BIZ
0˚C to +70˚C
Rails
Z03A
M08A
−40˚C to +85˚C
SO-8
LM431BCM/ LM431ACM/
431BCM LM431ACM
Rails
Tape & Reel
Rails
0˚C to +70˚C
−40˚C to +85˚C
0˚C to +70˚C
LM431CCMX/ LM431BCMX/ LM431ACMX/
431CCM
431BCM
LM431BIM/
431BIM
LM431ACM
LM431AIM/
LM431AIM
LM431CIM/
431CIM
LM431CIMX/
431CIM
LM431BIMX/ LM431AIMX/
431BIM LM431AIM
Tape &Reel
Rails
SOT-23
LM431CCM3/ LM431BCM3/ LM431ACM3/
N1B N1D N1F
LM431CCM3X/ LM431BCM3X/ LM431ACM3X/
Tape & Reel
Rails
N1B
N1D
N1F
MF03A
LM431CIM3
N1A
LM431BIM3
N1C
LM431AIM3
N1E
−40˚C to +85˚C
−40˚C to +85˚C
LM431CIM3X LM431BIM3X LM431AIM3X
Tape &Reel
N1A
N1C
N1E
micro SMD
LM431AIBP
LM431AIBPX
(Note 1)
250 Units Tape and
Reel
–
–
BPA04AFB
3k Units Tape and
Reel
Note 1: The micro SMD package marking is a 1 digit manufacturing Date Code only
micro SMD Top View Marking Example
01005556
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2
Symbol and Functional Diagrams
01005599
01005555
DC Test Circuits
01005504
FIGURE 1. Test Circuit for VZ = VREF
01005505
Note:
V
= V
(1 + R1/R2) + IREF• R1
REF
Z
>
FIGURE 2. Test Circuit for VZ VREF
01005506
Test Circuit for Off-State Current
3
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Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Reference Voltage
Reference Input Current
Internal Power Dissipation (Notes 3,
4)
−0.5V
10 mA
Storage Temperature Range
Operating Temperature Range
Industrial (LM431xI)
−65˚C to +150˚C
TO-92 Package
0.78W
0.81W
0.28W
0.30W
SO-8 Package
SOT-23 Package
micro SMD Package
−40˚C to +85˚C
0˚C to +70˚C
Commercial (LM431xC)
Soldering Information
Operating Conditions
Min
Infrared or Convection (20 sec.)
Wave Soldering (10 sec.)
Cathode Voltage
235˚C
260˚C (lead temp.)
37V
Max
Cathode Voltage
Cathode Current
VREF
37V
1.0 mA
100 mA
Continuous Cathode Current
−10 mA to +150
mA
LM431
Electrical Characteristics
TA = 25˚C unless otherwise specified
Symbol
VREF
Parameter
Reference Voltage
Conditions
Min
Typ
Max
Units
VZ = VREF, II = 10 mA
2.440
2.470
2.485
2.495
2.550
V
LM431A (Figure 1 )
VZ = VREF, II = 10 mA
LM431B (Figure 1 )
2.495
2.500
8.0
2.520
2.510
17
V
VZ = VREF, II = 10 mA
LM431C (Figure 1 )
V
VDEV
Deviation of Reference Input Voltage Over
Temperature (Note 5)
VZ = VREF, II = 10 mA,
TA = Full Range (Figure 1 )
IZ = 10 mA VZ from VREF to 10V
mV
Ratio of the Change in Reference Voltage
−1.4
−1.0
2.0
−2.7
−2.0
4.0
mV/V
µA
to the Change in Cathode Voltage
Reference Input Current
(Figure 2 )
VZ from 10V to 36V
∞
,
IREF
R1 = 10 kΩ, R2
=
II = 10 mA (Figure 2 )
∝
∞
,
IREF
Deviation of Reference Input Current over
Temperature
R1 = 10 kΩ, R2
=
II = 10 mA,
0.4
1.2
µA
TA = Full Range (Figure 2 )
VZ = VREF (Figure 1 )
IZ(MIN)
IZ(OFF)
Minimum Cathode Current for Regulation
Off-State Current
0.4
0.3
1.0
1.0
mA
µA
VZ = 36V, VREF = 0V (Figure *NO
TARGET FOR fi* )
rZ
Dynamic Output Impedance (Note 6)
VZ = VREF, LM431A,
0.75
0.50
Ω
Ω
Frequency = 0 Hz (Figure 1 )
VZ = VREF, LM431B, LM431C
Frequency = 0 Hz (Figure 1 )
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.
Note 3: T
= 150˚C.
J Max
Note 4: Ratings apply to ambient temperature at 25˚C. Above this temperature, derate the TO-92 at 6.2 mW/˚C, the SO-8 at 6.5 mW/˚C, the SOT-23 at 2.2 mW/˚C
and the micro SMD at 3mW/˚C.
Note 5: Deviation of reference input voltage, V
, is defined as the maximum variation of the reference input voltage over the full temperature range.
DEV
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4
LM431
Electrical Characteristics (Continued)
01005507
∝
The average temperature coefficient of the reference input voltage,
V
, is defined as:
REF
Where:
− T = full temperature change (0-70˚C).
T
2
1
∝
V
can be positive or negative depending on whether the slope is positive or negative.
REF
Example: V
= 8.0 mV, V
= 2495 mV, T − T = 70˚C, slope is positive.
REF 2 1
DEV
Note 6: The dynamic output impedance, r , is defined as:
Z
When the device is programmed with two external resistors, R1 and R2, (see Figure 2 ), the dynamic output impedance of the overall circuit, r , is defined as:
Z
5
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Equivalent Circuit
01005503
Typical Performance Characteristics
Input Current vs VZ
Thermal Information
01005529
01005530
Input Current vs VZ
Dynamic Impedance vs Frequency
01005531
01005509
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6
Typical Performance Characteristics (Continued)
Stability Boundary Conditions
01005510
01005511
Note: The areas under the curves represent conditions that may cause the
+
device to oscillate. For curves B, C, and D, R2 and V were adjusted to
+
establish the initial V and I conditions with C = 0. V and C were then
Z
Z
L
L
adjusted to determine the ranges of stability.
Test Circuit for Curve A Above
Test Circuit for Curves B, C and D Above
01005512
01005513
Typical Applications
Single Supply Comparator with
Temperature Compensated Threshold
Shunt Regulator
01005514
01005515
7
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Typical Applications (Continued)
Higher Current Shunt Regulator
Series Regulator
01005518
01005516
Crow Bar
Output Control of a Three
Terminal Fixed Regulator
01005519
01005517
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8
Typical Applications (Continued)
Over Voltage/Under Voltage
Protection Circuit
01005520
Voltage Monitor
01005521
9
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Typical Applications (Continued)
Current Limiter or Current Source
Delay Timer
01005523
01005522
Constant Current Sink
01005524
2.0 LM431 micro SMD Light Sensitivity
Application Info
When the LM431 micro SMD package is exposed to bright
sunlight, normal office fluorescent light, and other LED’s and
lasers, it operates within the guaranteed limits specified in
the electrical characteristics table.
1.0 Mounting
To ensure that the geometry of the micro SMD package
maintains good physical contact with the printed circuit
board, pin A1 (NC) must be soldered to the pcb. Please see
AN-1112 for more detailed information regarding board
mounting techniques for the micro SMD package.
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10
Physical Dimensions inches (millimeters) unless otherwise noted
8-Pin SOIC
NS Package Number M08A
SOT-23 Molded Small Outline Transistor Package (M3)
NS Package Number MF03A
11
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NS Package Number Z03A
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12
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NOTES: UNLESS OTHERWISE SPECIFIED
1. EPOXY COATING
2. 63Sn/37Pb EUTECTIC BUMP
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS
PACKAGE HEIGHT.
6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BA.
4-Bump micro SMD
X1 = 0.777 X2 = 0.904 X3 = 0.850
NS Package Number BPA04AFB
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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