NSC LM431CIM/ Adjustable precision zener shunt regulator Datasheet

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. It is now available in a chip sized package (4-Bump micro SMD) using National’s micro SMD package 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 excellent replacement for many zener diode applications.
n Average temperature coefficient 50 ppm/˚C
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
SOT-23: 3-Lead Small Outline
TO-92: Plastic Package
01005528
01005501
Top View
Top View
4-Bump micro SMD
SO-8: 8-Pin Surface Mount
01005554
01005502
Top view
Top View
(bump side down)
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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LM431 Adjustable Precision Zener Shunt Regulator
March 2005
LM431
Ordering Information
Package
Typical Accuracy Order Number/Package
Marking
0.5%
TO-92
SO-8
SOT-23
1%
Temperature
Range
LM431BCZ/
LM431BCZ
LM431ACZ/
LM431ACZ
0˚C to +70˚C
LM431CIZ/
LM431CIZ
LM431BIZ/
LM431BIZ
LM431AIZ/
LM431AIZ
−40˚C to +85˚C
LM431CCM/
431CCM
LM431BCM/
431BCM
LM431ACM/
LM431ACM
LM431CCMX/
431CCM
LM431BCMX/ LM431ACMX/
431BCM
LM431ACM
LM431CIM/
431CIM
LM431BIM/
431BIM
LM431AIM/
LM431AIM
LM431CIMX/
431CIM
LM431BIMX/
431BIM
LM431AIMX/
LM431AIM
LM431CCM3/
N1B
LM431BCM3/ LM431ACM3/
N1D
N1F
LM431BIM3
N1C
–
–
Tape & Reel
M08A
Rails
−40˚C to +85˚C
Tape &Reel
Rails
0˚C to +70˚C
Tape & Reel
MF03A
LM431AIM3
N1E
Rails
−40˚C to +85˚C
Tape &Reel
LM431AIBP
LM431AIBPX
(Note 1)
−40˚C to +85˚C
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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Z03A
0˚C to +70˚C
LM431BIM3X LM431AIM3X
N1C
N1E
micro SMD
Rails
Rails
LM431CCM3X/ LM431BCM3X/ LM431ACM3X/
N1B
N1D
N1F
LM431CIM3X
N1A
NSC
Drawing
2%
LM431CCZ/
LM431CCZ
LM431CIM3
N1A
Transport Media
2
250 Units Tape and
Reel
3k Units Tape and
Reel
BPA04AFB
LM431
Symbol and Functional Diagrams
01005599
01005555
DC Test Circuits
01005504
FIGURE 1. Test Circuit for VZ = VREF
01005505
Note:
VZ = VREF (1 + R1/R2) + IREF • R1
FIGURE 2. Test Circuit for VZ > VREF
01005506
Test Circuit for Off-State Current
3
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LM431
Absolute Maximum Ratings (Note 2)
Reference Voltage
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
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
−65˚C to +150˚C
Operating Temperature Range
Industrial (LM431xI)
−40˚C to +85˚C
Commercial (LM431xC)
−0.5V
micro SMD Package
0˚C to +70˚C
0.30W
Soldering Information
Infrared or Convection (20 sec.)
Wave Soldering (10 sec.)
Operating Conditions
235˚C
Min
260˚C (lead temp.)
37V
Cathode Voltage
VREF
37V
−10 mA to +150
mA
Cathode Current
1.0 mA
100 mA
Cathode Voltage
Continuous Cathode Current
Max
LM431
Electrical Characteristics
TA = 25˚C unless otherwise specified
Symbol
VREF
Parameter
Reference Voltage
Conditions
VZ = VREF, II = 10 mA
Min
Typ
Max
Units
2.440
2.495
2.550
V
2.470
2.495
2.520
V
2.485
2.500
2.510
V
8.0
17
mV
−1.4
−2.7
mV/V
−1.0
−2.0
2.0
4.0
µA
0.4
1.2
µA
LM431A (Figure 1 )
VZ = VREF, II = 10 mA
LM431B (Figure 1 )
VZ = VREF, II = 10 mA
LM431C (Figure 1 )
VDEV
Deviation of Reference Input Voltage Over
VZ = VREF, II = 10 mA,
Temperature (Note 5)
TA = Full Range (Figure 1 )
Ratio of the Change in Reference Voltage
IREF
IZ = 10 mA
VZ from VREF to 10V
VZ from 10V to 36V
to the Change in Cathode Voltage
(Figure 2 )
Reference Input Current
R1 = 10 kΩ, R2 = ∞,
II = 10 mA (Figure 2 )
Deviation of Reference Input Current over
R1 = 10 kΩ, R2 = ∞,
Temperature
II = 10 mA,
IZ(MIN)
Minimum Cathode Current for Regulation
VZ = VREF (Figure 1 )
0.4
1.0
mA
IZ(OFF)
Off-State Current
VZ = 36V, VREF = 0V (Figure *NO
TARGET FOR fi* )
0.3
1.0
µA
rZ
Dynamic Output Impedance (Note 6)
VZ = VREF, LM431A,
0.75
Ω
0.50
Ω
∝IREF
TA = Full Range (Figure 2 )
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: TJ Max = 150˚C.
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, VDEV, is defined as the maximum variation of the reference input voltage over the full temperature range.
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4
LM431
LM431
Electrical Characteristics
(Continued)
01005507
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 6: 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:
5
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LM431
Equivalent Circuit
01005503
Typical Performance Characteristics
Input Current vs VZ
Thermal Information
01005529
01005530
Input Current vs VZ
Dynamic Impedance vs Frequency
01005531
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01005509
6
LM431
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 VZ and IZ conditions with CL = 0. V+ and CL were then
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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LM431
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
LM431
Typical Applications
(Continued)
Over Voltage/Under Voltage
Protection Circuit
01005520
Voltage Monitor
01005521
9
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LM431
Typical Applications
(Continued)
Current Limiter or Current Source
Delay Timer
01005523
01005522
Constant Current Sink
01005524
2.0 LM431 micro SMD Light Sensitivity
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.
Application Info
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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LM431
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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LM431
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
NS Package Number Z03A
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12
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.
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LM431 Adjustable Precision Zener Shunt Regulator
Physical Dimensions
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