LM431AIM3XN1E [NSC]
IC 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495 V, PDSO3, SOT-23, 3 PIN, Voltage Reference;
| 型号： | LM431AIM3XN1E |
| 厂家： | 
National Semiconductor |
| 描述： | IC 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495 V, PDSO3, SOT-23, 3 PIN, Voltage Reference 光电二极管 输出元件 |
| 文件： | 总15页 (文件大小：350K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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September 2, 2010
LM431
Adjustable Precision Zener Shunt Regulator
General Description
Features
The LM431 is a 3-terminal adjustable shunt regulator with
guaranteed temperature stability over the entire temperature
range of operation. 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 excellent
replacement for many zener diode applications.
Average temperature coefficient 50 ppm/°C
■
■
Temperature compensated for operation over the full
temperature range
Programmable output voltage
Fast turn-on response
Low output noise
■
■
■
Connection Diagrams
TO-92: Plastic Package
SOT-23: 3-Lead Small Outline
1005528
Top View
1005501
Top View
SO-8: 8-Pin Surface Mount
1005502
Top view
Note: NC = Not internally connected.
© 2010 National Semiconductor Corporation
10055
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Ordering Information
Package
Typical Accuracy Order Number/Package Marking
Temperature
Range
Transport
Media
NSC
Drawing
0.5%
1%
2%
TO-92
LM431CCZ/
LM431CCZ
LM431BCZ/
LM431BCZ
LM431ACZ/
LM431ACZ
0°C to +70°C
Rails
Z03A
LM431CIZ/
LM431CIZ
LM431BIZ/
LM431BIZ
LM431AIZ/
LM431AIZ
−40°C to +85°C
SO-8
LM431CCM/
431CCM
LM431BCM/
431BCM
LM431ACM/
LM431ACM
Rails
Tape & Reel
Rails
0°C to +70°C
−40°C to +85°C
0°C to +70°C
LM431CCMX/
431CCM
LM431BCMX/
431BCM
LM431ACMX/
LM431ACM
M08A
LM431CIM/
431CIM
LM431BIM/
431BIM
LM431AIM/
LM431AIM
LM431CIMX/
431CIM
LM431BIMX/
431BIM
LM431AIMX/
LM431AIM
Tape &Reel
Rails
SOT-23
LM431CCM3/
N1B
LM431BCM3/
N1D
LM431ACM3/
N1F
LM431CCM3X/
N1B
LM431BCM3X/
N1D
LM431ACM3X/
N1F
Tape & Reel
Rails
MF03A
LM431CIM3
N1A
LM431BIM3
N1C
LM431AIM3
N1E
−40°C to +85°C
LM431CIM3X
N1A
LM431BIM3X
N1C
LM431AIM3X
N1E
Tape &Reel
Symbol and Functional Diagrams
1005599
1005555
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2
DC Test Circuits
1005504
1005505
Note: VZ = VREF (1 + R1/R2) + IREF• R1
FIGURE 1. Test Circuit for VZ = VREF
FIGURE 2. Test Circuit for VZ > VREF
1005506
FIGURE 3. Test Circuit for Off-State Current
3
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Absolute Maximum Ratings (Note 1)
Operating Conditions
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Min
Max
37V
Cathode Voltage
Cathode Current
VREF
1.0 mA
100 mA
Storage Temperature Range
Operating Temperature Range
Industrial (LM431xI)
−65°C to +150°C
−40°C to +85°C
0°C to +70°C
Commercial (LM431xC)
Soldering Information
Infrared or Convection (20 sec.)
Wave Soldering (10 sec.)
Cathode Voltage
235°C
260°C (lead temp.)
37V
Continuous Cathode Current
Reference Voltage
−10 mA to +150 mA
−0.5V
Reference Input Current
10 mA
Internal Power Dissipation (Note 2,
Note 3)
ꢀ
0.78W
0.81W
0.28W
TO-92 Package
SO-8 Package
SOT-23 Package
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
2.495
2.495
2.500
8.0
2.550
V
LM431A (Figure 1 )
VZ = VREF, II = 10 mA
LM431B (Figure 1 )
2.470
2.485
2.520
2.510
17
V
VZ = VREF, II = 10 mA
LM431C (Figure 1 )
VZ = VREF, II = 10 mA,
TA = Full Range (Figure 1 )
V
VDEV
Deviation of Reference Input Voltage Over
Temperature (Note 4)
mV
mV/V
Ratio of the Change in Reference Voltage
to the Change in Cathode Voltage
IZ = 10 mA
VZ from VREF to 10V
VZ from 10V to 36V
−1.4
−1.0
−2.7
−2.0
(Figure 2 )
IREF
Reference Input Current
2.0
4.0
R1 = 10 kΩ, R2 = ∞,
II = 10 mA (Figure 2 )
μA
∝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)
rZ
Minimum Cathode Current for Regulation
Off-State Current
0.4
0.3
1.0
1.0
mA
μA
Ω
VZ = 36V, VREF = 0V (Figure 3)
VZ = VREF, LM431A,
Dynamic Output Impedance (Note 5)
0.75
Frequency = 0 Hz (Figure 1 )
VZ = VREF, LM431B, LM431C
Frequency = 0 Hz (Figure 1 )
0.50
Ω
Note 1: 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 2: TJ Max = 150°C.
Note 3: 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.
Note 4: Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference input voltage over the full temperature range.
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4
1005507
The average temperature coefficient of the reference input voltage, ∝VREF, is defined as:
Where:
T2 − T1 = full temperature change (0-70°C).
∝VREF can be positive or negative depending on whether the slope is positive or negative.
Example: VDEV = 8.0 mV, VREF = 2495 mV, T2 − T1 = 70°C, slope is positive.
Note 5: The dynamic output impedance, rZ, is defined as:
When the device is programmed with two external resistors, R1 and R2, (see Figure 2 ), the dynamic output impedance of the overall circuit, rZ, is defined as:
Equivalent Circuit
1005503
5
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Typical Performance Characteristics
Input Current vs VZ
Thermal Information
1005529
1005530
Input Current vs VZ
Dynamic Impedance vs Frequency
1005531
1005509
Stability Boundary Conditions
1005510
1005511
Note: The areas under the curves represent conditions that may cause the de-
vice to oscillate. For curves B, C, and D, R2 and V+ were adjusted to establish
the initial VZ and IZ conditions with CL = 0. V+ and CL were then adjusted to de-
termine the ranges of stability.
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6
Test Circuit for Curve A Above
Test Circuit for Curves B, C and D Above
1005512
1005513
Typical Applications
Shunt Regulator
1005514
Single Supply Comparator with
Temperature Compensated Threshold
1005515
7
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Series Regulator
1005516
Output Control of a Three
Terminal Fixed Regulator
1005517
Higher Current Shunt Regulator
1005518
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8
Crow Bar
1005519
Over Voltage/Under Voltage
Protection Circuit
1005520
9
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Voltage Monitor
1005521
Delay Timer
1005522
Current Limiter or Current Source
1005523
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10
Constant Current Sink
1005524
11
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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
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12
NS Package Number Z03A
13
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Notes
For more National Semiconductor product information and proven design tools, visit the following Web sites at:
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相关型号：
LM431AIMX/NOPB
IC 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495 V, PDSO8, SOIC-8, Voltage Reference
NSC
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