LND431LV
Low-voltage
Adjustable Precision Shunt Regulators
DATA SHEET
GENERAL DESCRIPTION
Equivalent Full-Range Temperature
Coefficient 30ppm/C
Temperature Compensated for
Operation Over Full Rated Operating
Temperature Range
Adjustable Output Voltage
Sink Current Capability 1mA to 100mA
Low
(0.2
Typ) Dynamic Output
Impedance
Low
Output
Noise
FEATURES
The LND431LV are three-terminal low-voltage
adjustable shunt regulators with specified
thermal stability. The output voltage may be set
to any value between V
ref
(approximately 1.24V)
and 6V with two external resistors. These
devices have typical output impedance of 0.2
..
PIN CONFIGURATION
SYMBOL
Linear Dimensions, Inc. 445 East Ohio Street, Chicago IL 60611 USA tel 312.321.1810 fax 312.321.1830
www.lineardimensions.com
PARAMETER
VALUE
UNITS
Cathode voltage (see note 1)
7
V
Continuous cathode current range
-20 to 20
Reference input current range
-.050 to 3.0
mA
Operating free-air temperature rage
0 to 70
Lead temperature 1.6mm from case for 10 seconds
260
C
Note1: Voltage values are with respect to the anode terminal unless otherwise noted
PARAMETER
VALUE
MAX
UNITS
Cathode voltage, V
KA
V
ref
6
V
Cathode current, I
k
(for regulation)
.1
15
mA
ABSOLUTE MAXIMUM RATINGS
LND431LV
RECOMMENDED OPERATING CONDITIONS
Linear Dimensions, Inc. 445 East Ohio Street, Chicago IL 60611 USA tel 312.321.1810 fax 312.321.1830
www.lineardimensions.com
FUNCTIONAL BLOCK DIAGRAM
+
CATHODE
-
REF
ANODE
V
REF
PARAMETER
SYMBOL
TEST
CIRCUIT
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Reference input voltage
V
ref
1
V
KA =
V
ref
, I
k
=10mA
1222
1240
1258
Deviation of reference
input voltage over full
temperature range
V
ref(dev)
1
V
KA =
V
ref
, I
K
=10mA,
T
A =
Full range
4
12
mV
Ratio of change in
reference input voltage to
the change in cathode
voltage
V
ref
/
V
KA
2
I
K
=10
mA
V
KA
=6V to V
ref
-1.4
-2.7
mV/V
Reference input current
I
ref
2
I
K
=10mA, R1=10K
,
R2=
T
A
=full range
0.15
0.5
Deviation of reference
input current over full
temperature range
I
ref(dev)
2
I
K
=10mA, R1=10K
,
R2=
T
A
=full range
0.05
0.3
A
Minimum cathode current
for regulation
I
min
1
V
KA =
V
ref
55
80
A
Off- state cathode current
I
off
3
V
KA =
6 V, V
ref
= 0
0.001
1
A
Dynamic impedance
|Z
KA
|
1
V
KA
=V
ref
, I
K
=1mA to
100mA, f
1KHz
0.2
0.4
Test Circuit 1. For V
KA
=V
REF
ELECTRICAL CHARACTERISTICS
LND431LV
PARAMETER MEASUREMENT INFORMATION
Test Circuit 2. For V
KA
> V
REF
Linear Dimensions, Inc. 445 East Ohio Street, Chicago IL 60611 USA tel 312.321.1810 fax 312.321.1830
www.lineardimensions.com
Ref Input Current v/s Junction Temperature
Ref Voltage v/s Junction Temperature
LND431LV
PARAMETER MEASUREMENT INFORMATION
Test Circuit 3. For I
OFF
TYPICAL CHARACTERISTICS
Cathode Current v/s Cathode Voltage
KA
V
A
-10
K
10
V
Cathode Current (mA)
=
REF
V
T
I
Cathode Voltage (V)
-5
KA
0
5
15
25*C
=
1.5
0.5
-0.5
1
-1
0
=
T
V
Cathode Current (
REF
I
Cathode Voltage (V)
25*C
A
=
V
K
KA
V
KA
1
-1
-0.5
0
0.5
1.5
A)
I
min
175
200
125
50
100
-50
25
75
150
-25
0
Linear Dimensions, Inc. 445 East Ohio Street, Chicago IL 60611 USA tel 312.321.1810 fax 312.321.1830
www.lineardimensions.com
250
200
150
100
50
0
-50
-25
0
25
50
75
I
10 mA
K
=
T
J
- Junction Temperature - C
-
R
e
f
e
re
nc
e I
npu
t
C
u
r
r
ent
-
nA
I
RE
F
R1 = 10 k
R2 = Open
100
-
R
e
f
e
re
nc
e V
o
lt
ag
e
-
V
RE
F
V
T
10 mA
1.2360
J
1.2440
=
1.2340
K
25
-50
I
1.2420
-25
1.2400
- Junction Temperature - C
50
75
0
1.2380
100
L
C - Load Capacitance - F
0
0.2
0.4
0.6
0.8
1.0
C
a
t
hod
e C
u
rrent
- mA
0.001
0.01
0.1
1
10
Tantalum Capacitors
* Stability boundary condition test shows that tantalum capacitors
are recommended to minimize the conditions that may cause
the device to oscillate.
LND431LV
Linear Dimensions, Inc. 445 East Ohio Street, Chicago IL 60611 USA tel 312.321.1810 fax 312.321.1830
www.lineardimensions.com
L
C - Load Capacitance - F
0
2
4
6
8
10
12
14
16
C
a
t
h
o
de C
u
rren
t
- m
A
0.001
0.01
0.1
1
10
Ceramic Capacitors
Stability Boundary Condition
T
A
=25
C
V
KA
=Vref
Stable
V
KA
=2 V
V
KA
=3V
T
A
=25
C
V
KA
=Vref
Stable
For V
KA
=2 & 3 V
Device does not
Oscillate
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