LM431BCM [NSC]
Adjustable Precision Zener Shunt Regulator; 可调式精密齐纳并联稳压器
| 型号： | LM431BCM |
| 厂家： | 
National Semiconductor |
| 描述： | Adjustable Precision Zener Shunt Regulator |
| 文件： | 总12页 (文件大小：383K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 2002
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
DS010055-28
DS010055-1
Top View
Top View
4-Bump micro SMD
SO-8: 8-Pin Surface Mount
DS010055-54
DS010055-2
Top View
(bump side down)
Top view
*
Note: NC = Not internally connected. Must be electrically isolated from the
rest of the circuit for the microSMD package.
© 2002 National Semiconductor Corporation
DS010055
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Ordering Information
Package
Typical Accuracy Order Number/Package Marking
Temperature
Range
Transport Media
NSC
Drawing
0.5%
1%
2%
LM431ACZ/
LM431ACZ
TO-92
LM431CCZ/
LM431CCZ
LM431BCZ/
LM431BCZ
0˚C to +70˚C
−40˚C to +85˚C
0˚C to +70˚C
Rails
Z03A
M08A
LM431CIZ/
LM431CIZ
LM431BIZ/
LM431BIZ
LM431AIZ/
LM431AIZ
SO-8
LM431CCM/
431CCM
LM431BCM/
431BCM
LM431ACM/
LM431ACM
Rails and Tape &Reel
Rails and Tape &Reel
LM431CIM/
431CIM
LM431BIM/
431BIM
LM431AIM/
LM431AIM
−40˚C to +85˚C
0˚C to +70˚C
SOT-23
LM431CCM3/ LM431BCM3/ LM431ACM3/
N1B
N1D
N1F
MF03A
LM431CIM3
N1A
LM431BIM3
N1C
LM431AIM3
N1E
−40˚C to +85˚C
−40˚C to +85˚C
micro SMD
LM431AIBP
LM431AIBPX(Note 1)
250 Units Tape and Reel
3k Units Tape and Reel
–
–
BPA04AFB
Note 1: The micro SMD package marking is a 1 digit manufacturing Date Code only
micro SMD Top View Marking Example
DS010055-56
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2
Symbol and Functional Diagrams
DS010055-99
DS010055-55
DC Test Circuits
DS010055-4
DS010055-5
Note:
V
= V
(1 + R1/R2) + IREF• R1
REF
FIGURE 1. Test Circuit for VZ = VREF
Z
>
FIGURE 2. Test Circuit for VZ VREF
DS010055-6
FIGURE 3. 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
−0.5V
Reference Input Current
10 mA
Internal Power Dissipation (Notes 3, 4)
TO-92 Package
SO-8 Package
SOT-23 Package
0.78W
0.81W
0.28W
Storage Temperature Range
Operating Temperature Range
Industrial (LM431xI)
−65˚C to +150˚C
micro SMD Package
0.30W
−40˚C to +85˚C
0˚C to +70˚C
Commercial (LM431xC)
Soldering Information
Operating Conditions
Min
Max
Infrared or Convection (20 sec.)
Wave Soldering (10 sec.)
Cathode Voltage
235˚C
260˚C (lead temp.)
37V
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
Parameter
Reference Voltage
Conditions
Min
Typ
Max
Units
VREF
VZ = VREF, II = 10 mA
2.440
2.495
2.550
2.520
2.510
17
V
LM431A (Figure 1 )
VZ = VREF, II = 10 mA
LM431B (Figure 1 )
2.470
2.485
2.495
2.500
8.0
V
V
VZ = VREF, II = 10 mA
LM431C (Figure 1 )
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)
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 6)
0.75
Frequency = 0 Hz (Figure 1 )
VZ = VREF, LM431B, LM431C
Frequency = 0 Hz (Figure 1 )
0.50
Ω
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)
DS010055-7
The average temperature coefficient of the reference input voltage,
V
, is defined as:
REF
Where:
T
− T = full temperature change (0-70˚C).
1
2
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.
DEV
REF 2 1
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
Equivalent Circuit
DS010055-3
5
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Typical Performance Characteristics
Input Current vs VZ
Thermal Information
Input Current vs VZ
DS010055-29
DS010055-31
DS010055-30
Dynamic Impedance vs Frequency
DS010055-10
DS010055-9
Stability Boundary Conditions
DS010055-11
+
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 adjusted to determine the ranges of stability.
Z
Z
L
L
Test Circuit for Curve A Above
Test Circuit for Curves B, C and D Above
DS010055-12
DS010055-13
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6
Typical Applications
Shunt Regulator
Single Supply Comparator with
Temperature Compensated Threshold
DS010055-14
DS010055-15
Series Regulator
Output Control of a Three
Terminal Fixed Regulator
DS010055-16
DS010055-17
Higher Current Shunt Regulator
Crow Bar
DS010055-18
DS010055-19
7
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Typical Applications (Continued)
Over Voltage/Under Voltage
Protection Circuit
DS010055-20
Voltage Monitor
DS010055-21
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8
Typical Applications (Continued)
Delay Timer
Current Limiter or Current Source
DS010055-23
DS010055-22
Constant Current Sink
DS010055-24
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.
9
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Physical Dimensions inches (millimeters) unless otherwise noted
NS Package Number M08A
SOT-23 Molded Small Outline Transistor Package (M3)
NS Package Number MF03A
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10
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NS Package Number Z03A
11
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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
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into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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