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부품번호 | LM431AIM3N1E 기능 |
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기능 | Adjustable Precision Zener Shunt Regulator | ||
제조업체 | National Semiconductor | ||
로고 | |||
December 1999
LM431
Adjustable Precision Zener Shunt Regulator
General Description
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.
Features
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
Connection Diagrams
TO-92: Plastic Package
SOT-23: 3-Lead Small Outline
Top View
DS010055-1
SO-8: 8-Pin Surface Mount
Top view
DS010055-2
Top View
DS010055-28
4-Bump micro SMD
DS010055-54
Top View
(bump side down)
© 1999 National Semiconductor Corporation DS010055
www.national.com
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Operating Temperature Range
Industrial (LM431xI)
Commercial (LM431xC)
Soldering Information
Infrared or Convection (20 sec.)
Wave Soldering (10 sec.)
Cathode Voltage
Continuous Cathode Current
−65˚C to +150˚C
−40˚C to +85˚C
0˚C to +70˚C
235˚C
260˚C (lead temp.)
37V
−10 mA to +150 mA
Reference Voltage
Reference Input Current
Internal Power Dissipation (Notes 3, 4)
TO-92 Package
SO-8 Package
SOT-23 Package
micro SMD Package
Operating Conditions
Cathode Voltage
Cathode Current
Min
VREF
1.0 mA
−0.5V
10 mA
0.78W
0.81W
0.28W
0.30W
Max
37V
100 mA
LM431
Electrical Characteristics
TA = 25˚C unless otherwise specified
Symbol
Parameter
VREF
Reference Voltage
VDEV
Deviation of Reference Input Voltage Over
Temperature (Note 5)
Ratio of the Change in Reference Voltage
Conditions
VZ = VREF, II = 10 mA
LM431A (Figure 1 )
VZ = VREF, II = 10 mA
LM431B (Figure 1 )
VZ = VREF, II = 10 mA
LM431C (Figure 1 )
VZ = VREF, II = 10 mA,
TA = Full Range (Figure 1 )
IZ = 10 mA VZ from VREF to 10V
Min
2.440
2.470
2.485
Typ
2.495
2.495
2.500
8.0
−1.4
Max Units
2.550 V
2.520 V
2.510 V
17 mV
−2.7 mV/V
IREF
∝IREF
IZ(MIN)
IZ(OFF)
rZ
to the Change in Cathode Voltage
Reference Input Current
Deviation of Reference Input Current over
Temperature
Minimum Cathode Current for Regulation
Off-State Current
Dynamic Output Impedance (Note 6)
(Figure 2 ) VZ from 10V to 36V
R1 = 10 kΩ, R2 = ∞,
II = 10 mA (Figure 2 )
R1 = 10 kΩ, R2 = ∞,
II = 10 mA,
TA = Full Range (Figure 2 )
VZ = VREF (Figure 1 )
VZ = 36V, VREF = 0V (Figure 3 )
VZ = VREF, LM431A,
Frequency = 0 Hz (Figure 1 )
VZ = VREF, LM431B, LM431C
Frequency = 0 Hz (Figure 1 )
−1.0
2.0
−2.0
4.0
µA
0.4 1.2 µA
0.4 1.0 mA
0.3 1.0 µA
0.75 Ω
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: 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.
www.national.com
4
4페이지 Typical Applications
Shunt Regulator
Single Supply Comparator with
Temperature Compensated Threshold
DS010055-14
Series Regulator
DS010055-15
Output Control of a Three
Terminal Fixed Regulator
DS010055-16
Higher Current Shunt Regulator
DS010055-17
Crow Bar
DS010055-18
DS010055-19
7 www.national.com
7페이지 | |||
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