ETC2 LM431LAN5-XX-AR Shunt regulator Datasheet

Shunt Regulator
LM431L LM431LA LM431LB
Shunt Regulator
General Description
TO-92
• The LM431 Series ICs are low voltage three-terminal
programmable shunt regulators with guaranteed thermal
stability over a full operation range. These monolithic ICs
voltage reference operate as a low temperature coefficient
Zener which is programmable from Vref to 18V with two external
resistors. These devices exhibit a wide operating current range
SOT-23-5
of 80µA to 50/100mA with a typical dynamic impedance of 0.05 to
0.22Ω. The characteristics of these references make them excellent
replacements for Zener diodes in many applications such as
digital voltmeters, power supplies and op amp circuitry
• The LM431L precision reference is offered in three voltage
tolerance for VREF=1.240V: 1.5%, 1.0% and 0.5%.
• These ICs are available in 4 packages: TO-92, SOT-23, SOT-23-5 and SOT-89.
.
SOT-23
SOT-89
.
Features
Applications
• Programmable Precise Output Voltage from
1.24V to 16/18V
• High Stability under Capacitive Load
• Low Temperature Deviation
•
•
•
•
Low Dynamic Output Impedance: 0.05 to 0.22Ω Typical
Operating Current from 80µA to 50/100mA.
Low Output Noise Voltage
RoHS Compliance
•
•
•
•
•
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PC Motherboard
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Rev. A/DX 2007-06-04
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Shunt Regulator
LM431L
Ordering Information
Pin Configuration
Outline: Z
TO-92
Outline: N5
SOT-23-5
Outline: N
SOT-23
Outline: K
SOT-89
Rev. A/DX 2007-06-04
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Shunt Regulator
LM431L
Block Diagram
Symbols
Absolute Maximum Ratings (Ta=25° C)
(Full operating ambient temperature range applies unless otherwise noted.)
Symbol
Description
LM431L
VKA
Cathode Voltage
16
18
V
IKA
Cathode Current Range (Continuous)
50
-100 ~ +100
mA
3
10
mA
TJ
Reference Input Current Range
(Continuous)
Operating Junction Temperature
TOPR
Operating Temperature Range
TSTG
Storage Temperature Range
IREF
PD
RthJA
Power Dissipation
Package Thermal
Impedance
LM431LA
LM431LB
150
-40 ~ 85
Unit
°C
-40 ~ 125
-65 ~ 150
°C
°C
Z:TO-92
700
770
N:SOT-23
350
370
N5:SOT-23-5
550
370
K: SOT-89
-
770
Z:TO-92
180
150
N:SOT-23
360
330
N5:SOT-23-5
230
250
K: SOT-89
-
50
mW
° C/W
Rev. A/DX 2007-06-04
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Page 3 of 13
Shunt Regulator
LM431L
Electrical Characteristics (TA=25ºC, unless otherwise specified)
Symbol
Description
LM431L
LM431LA
LM431LB
Unit
Test
Circuit
Conditions
V
Fig.1
VKA=VREF,IKA=10mA
mV
Fig.1
(Note1)
VKA=VREF,IKA=10mA
-1.5
mV/V
Fig.2
IKA=
10mA
0.15
0.4
µA
Fig.2
IKA=10mA, R1=10KΩ,
R2=∞
-
0.1
0.4
µA
Fig.2
IKA=10mA, R1=10KΩ,
R2=∞
80
-
55
80
µA
Fig.1
VKA=VREF
40
100
-
40
100
-
10
50
-
10
50
-
0.05
0.15
-
0.05
0.15
Min.
Typ.
Max.
Min.
Typ.
Max.
Min.
Typ.
Max.
1.222
1.240
1.258
1.228
1.240
1.252
1.234
1.240
1.246
-
-
-
-
2
1-
-
2
10
-
7.0
20
-
3
10
-
3
10
-
-
-
-
4
15
-
4
15
-
-0.6
-1.5
-
-0.5
-1.5
-
-0.5
-
0.15
0.3
-
0.15
0.4
-
Reference Input
Current Deviation
Over Temperature
Range
-
0.05
0.08
-
0.1
0.4
IMIN
Min. Cathode Current
For Regulation
-
55
80
-
55
-
2.6
1000
-
IOFF
Off-State Cathode
Current
-
-
-
-
0.22
0.4
VREF
∆VREF
∆VREF/∆VKA
IREF
∆IREF
ZKA
Reference Input
Voltage
Reference
Input
Voltage
Deviation
0-70° C
-40-85
°C
-40-125
°C
Ratio of Change in
Reference Input
Voltage to Change in
Cathode to Anode
Voltage
Reference
Ta=25°
Input
C
Current
Dynamic Impedance
nA
Fig.1- Test Circuit for VKA=VREF
∆VKA=
VKA(max)
~VREF
VKA= VKA(max),
VREF=0V
Fig.3
VKA=6V, VREF=0V
Ω
Fig.1
(Note2)
VKA=VREF,
IKA=1.0mA~ IKA(max),
f≤1.0KHz
Fig.2- Test Circuit for VKA>VREF
Rev. A/DX 2007-06-04
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Shunt Regulator
LM431L
Fig.3- Test Circuit for IOFF
Note1:
Note2:
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Shunt Regulator
LM431L
Typical Characteristics Curves
Junction Temperature TJ (° C)
Fig.5- IREF - TJ
Reference Input Current IREF (nA)
Reference Input Voltage VREF (V)
Fig.4- VREF - TJ
Junction Temperature TJ (° C)
Fig.7- IK – VKA (2)
Cathode Current IK (µA)
Cathode Current IK (mA)
Fig.6- IK – VKA (1)
Cathode Voltage VKA (V)
Cathode Voltage VKA (V)
Rev. A/DX 2007-06-04
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Page 6 of 13
Shunt Regulator
LM431L
Fig.9- Pulse Response
Voltage Swing (V)
Open Loop Voltage Gain GVO (dB)
Fig.8- GVO - f
Time t (µs)
Frequency f (Hz)
Fig.11- ZKA - f
∆VREF/∆VKA (mV/V)
Dynamic Impedance │ZKA│ (Ω)
Fig.10- ∆VREF - TJ
Junction Temperature TJ (° C)
Frequency f (Hz)
Rev. A/DX 2007-06-04
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Shunt Regulator
LM431L
Typical Application
Fig.12-Shunt Regulator
Fig.13- High Current Shunt Regulator
Fig.14- Current Source of Current Limit
Rev. A/DX 2007-06-04
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Page 8 of 13
Shunt Regulator
LM431L
Typical Application (Continued)
Fig.15- Precision 5V 1A Regulator
Fig.16- PWM Converter with Reference
Rev. A/DX 2007-06-04
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Page 9 of 13
Shunt Regulator
LM431L
Device Marking Code
Circuit
LM431L
Tolerance
SOT-23 (N)
SOT-23-5 (N5)
SOT-89 (K)
Blank
1.5%
24A
24A
N/A
A
1.0%
EA7
E6A
E41B
B
0.5%
EA6
E5A
E41A
Dimensions in inches (mm)
TO-92
Rev. A/DX 2007-06-04
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Page 10 of 13
Shunt Regulator
LM431L
SOT-23
SOT-23-5
Rev. A/DX 2007-06-04
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Page 11 of 13
Shunt Regulator
LM431L
SOT-89
Rev. A/DX 2007-06-04
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Page 12 of 13
Shunt Regulator
LM431L
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