UNISONIC TECHNOLOGIES CO., LTD
LL431
PROGRAMMABLE PRECISION
REFERENCE
DESCRIPTION
The UTC
LL431
is a three-terminal adjustable regulator with a
guaranteed thermal stability over applicable temperature ranges.
The output voltage may be set to any value between V
REF
(approximately 2.5V) and 36 V with two external resistors. It
can be used in provides very wide applications including shunt
regulator, series regulator, switching regulator, voltage reference
and others.
4
5
2
3
1
LINEAR INTEGRATED CIRCUIT
3
2
1
SOT-23
1
SOT-25
SOT-89
FEATURES
*Programmable output Voltage to 36V.
*Low dynamic output impedance 0.2Ω.
*Sink current capability of 1.0 to 100mA.
*Equivalent full-range temperature coefficient of 50ppm/
°C
typical for operation over full rated operating temperature range.
1
SOP-8
TO-92
ORDERING INFORMATION
Ordering Number
Pin Assignment
Package
Lead Free
Halogen Free
1 2 3 4 5 6
LL431K-AB3-R
LL431G-AB3-R
SOT-89
R A K
-
-
-
LL431K-AE3-R
LL431G-AE3-R
SOT-23
K R A
-
-
-
LL431NSL-AE3-R
LL431NSG-AE3-R
SOT-23
R K A
-
-
-
LL431K-AF5-R
LL431G-AF5-R
SOT-25
X X K R A
-
LL431K-S08-R
LL431G-S08-R
SOP-8
K A A X X A
LL431K-T92-B
LL431G-T92-B
TO-92
R A K
-
-
-
LL431K-T92-K
LL431G-T92-K
TO-92
R A K
-
-
-
LL431K-T92-R
LL431G-T92-R
TO-92
R A K
-
-
-
Note: Pin Code: K: Cathode
A: Anode
R: Reference
X: No Connection
7
-
-
-
-
A
-
-
-
8
-
-
-
-
R
-
-
-
Packing
Tape Reel
Tape Reel
Tape Reel
Tape Reel
Tape Reel
Tape Box
Bulk
Tape Reel
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Copyright © 2011 Unisonic Technologies Co., Ltd
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QW-R121-020,E
LL431
MARKING
PACKAGE
MARKING
LINEAR INTEGRATED CIRCUIT
SOT-23
SOT-23
(LL431NS)
4
G: Halogen Free
K: Lead Free
3
5
SOT-25
LL431
1
2
BLOCK DIAGRAM
CATHODE
REFERENCE
CATHODE (K)
REFERENCE (R)
2.5V V
REF
ANODE(A)
ANODE
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QW-R121-020,E
LL431
PARAMETER
SYMBOL
V
KA
I
KA
I
REF
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(Operating temperature range applies unless otherwise specified)
RATINGS
UNIT
Cathode Voltage
37
V
Cathode Current Range(Continuous)
-100 ~ +150
mA
Reference Input Current
-0.05 ~ +10
mA
SOT-89
500
mW
SOT-23/ SOT-25
300
mW
Power Dissipation
P
D
SOP-8
600
mW
TO-92
770
mW
Junction Temperature
T
J
+150
°C
Operating Temperature
T
OPR
-40 ~ +85
°C
Storage Temperature
T
STG
-65 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Cathode Voltage
Cathode Current
SYMBOL
V
KA
I
KA
RATINGS
V
REF
~
36
1
~
100
UNIT
V
mA
ELECTRICAL CHARACTERISTICS
(T
C
= 25℃, unless otherwise specified.)
PARAMETER
Reference Input Voltage
Deviation of reference Input Voltage
Over temperature
Ratio of Change in Reference Input
Voltage to the Change in Cathode Voltage
Reference Input Current
Deviation of Reference Input Current Over
Full Temperature Range
Minimum Cathode Current for Regulation
Off-State Cathode Current
Dynamic Impedance
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
V
REF
V
KA
=V
REF
,I
KA
=10mA
±0.5% 2.483 2.495 2.507
V
V
KA
=V
REF
,I
KA
=10mA
ΔV
REF
/ΔT
4.5
17
mV
0°C≦T
A
≦70°C
-1.0
-2.7
ΔV
KA
=10V~V
REF
ΔV
REF
/ΔV
KA
I
KA
=10mA
mV/V
ΔV
KA
=36V~10V
-0.5 -2.0
I
REF
I
KA
=10mA, R1=10kΩ, R2=∞
1.5
4
μA
I
KA
=10mA, R1=10kΩ, R2=∞
ΔI
REF
/ΔT
0.4
1.2
μA
T
A
=full Temperature
I
KA(MIN)
V
KA
=V
REF
0.15
mA
I
KA(OFF)
V
KA
=36V, V
REF
=0
0.05
1.0
μA
V
KA
=V
REF
, I
KA
=1 to 100mA
0.15
0.5
Ω
Z
KA
f≤1.0kHz
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TECHNOLOGIES CO., LTD
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QW-R121-020,E
LL431
TEST CIRCUIT
LINEAR INTEGRATED CIRCUIT
For V
KA
=V
REF
For V
KA
≧
V
REF
For I
KA(OFF)
APPLICATION CIRCUIT
V
IN
V
IN
IN
V
IN
Vo
UT
Vo
UT
UTC7805
R
1
COMMON
OUT
R1
Vo
UT
R
1
V
REF
R
2
UTC LL431
UTC LL431
V
REF
R
2
V
REF
R
2
UTC LL431
V
OUT
=(1+R
1
/R
2
)*V
REF
V
OUT
=(1+R
1
/R
2
)*V
REF
V
OUT
=(1+R
1
/R
2
)*V
REF
Shutdown Regulator
Output Control of a Three
-Terminal Fixed Regulator
Higher-current Shunt Regulator
Constant-current Sink
Current Limiting or Current Source
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QW-R121-020,E
LL431
■
TYPICAL CHARACTERISTICS
Cathode Current vs. Cathode Voltage
150
125
LINEAR INTEGRATED CIRCUIT
Cathode Current vs. Cathode Voltage
800
Cathode Current (mA)
100
75
50
25
0
-25
-50
-75
-100
-2
T
A
=25°C
V
KA
=V
REF
Cathode Current (μA)
600
T
A
=25°C
V
KA
=V
REF
400
I
KA(MIN)
200
0
-1
0
1
2
3
-200
-2
-1
0
1
2
3
Cathode Voltage (V)
Cathode Voltage (V)
0
Change in Reference Input Voltage vs.
Cathode Voltage
Pulse Response
7
Change In Reference Input Voltage (mV)
-5
-10
-15
-20
-25
-30
-35
-40
-50
T
A
=25°C
Input and Output Voltage (V)
40
I
KA
=100mA
T
A
=25°C
6
5
4
3
2
1
0
-1
-1
0
1
2
3
4
5
6
7
0
5
10
15
20
25
30
35
Cathode Voltage (V)
Time (μs)
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC
TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R121-020,E
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