LND431LV
Low-voltage Adjustable Precision Shunt Regulators
DATA
SHEET
GENERAL DESCRIPTION
• Equivalent Full-Range Temperature
Coefficient 30ppm/ºC
• Temperature Compensated for
Operation Over Full Rated Operating
Temperature Range
• Adjustable Output Voltage
• Sink Current Capability 1mA to 100mA
• Low (0.2 Ω 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 Vref (approximately 1.24V)
and 6V with two external resistors. These
devices have typical output impedance of 0.2Ω..
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 ºC
Note1: Voltage values are with respect to the anode terminal unless otherwise noted
PARAMETER VALUE MAX UNITS
Cathode voltage, VKA Vref 6V
Cathode current, Ik (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 Vref 1V
KA = Vref, Ik =10mA 1222 1240 1258
Deviation of reference
input voltage over full
temperature range
Vref(dev) 1VKA = Vref, IK =10mA,
TA = Full range 412
mV
Ratio of change in
reference input voltage to
the change in cathode
voltage
∆Vref/∆VKA 2
IK=10
mA ∆VKA=6V to Vref -1.4 -2.7 mV/V
Reference input current Iref 2
IK=10mA, R1=10KΩ,
R2=∞
TA =full range
0.15 0.5
Deviation of reference
input current over full
temperature range
Iref(dev) 2
IK=10mA, R1=10KΩ,
R2=∞
TA =full range
0.05 0.3
µA
Minimum cathode current
for regulation Imin 1V
KA = Vref 55 80 µA
Off- state cathode current Ioff 3V
KA = 6 V, Vref= 0 0.001 1 µA
Dynamic impedance |ZKA|1
VKA =Vref, IK=1mA to
100mA, f≤ 1KHz 0.2 0.4 Ω
Test Circuit 1. For VKA =VREF
ELECTRICAL CHARACTERISTICS
LND431LV
PARAMETER MEASUREMENT INFORMATION
Test Circuit 2. For VKA > VREF
• 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 TemperatureRef Voltage v/s Junction Temperature
LND431LV
PARAMETER MEASUREMENT INFORMATION
Test Circuit 3. For IOFF
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
=
1.50.5-0.5 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
µ
A)
Imin
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
I10 mA
K
=
T
J
- Junction Temperature - C
- Ref erence Input Current - nA
I
REF
R1 = 10 k
Ω
R2 = Open
100
- Ref erence Voltage - V
REF
V
T
10 mA
1.2360
J
1.2440
=
1.2340
K
25-50
I
1.2420
-25
1.2400
- Junction Temperature - C
50 750
1.2380
10
0
L
C - Load Capacitance - F
0
0.2
0.4
0.6
0.8
1.0
Cathode Current - mA
0.001 0.01 0.1 1 10
µ
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
Cathode Current - mA
0.001 0.01 0.1 1 10
µ
Ceramic Capacitors
Stability Boundary Condition
TA=25°C
VKA=Vref
Stable
VKA=2 V
VKA=3V
TA=25°C
VKA=Vref
Stable
For VKA=2 & 3 V
Device does not
Oscillate
TYPICAL APPLICATIONS
Figure 1. Shunt Regulator Figure 2. Single-supply comparator
With tem
p
erature com
p
ensated threshold
• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •
INPUT
OUTPUT
V+
GND
V
V
on
off
= 1.24V
= V+
V
(th)
= 1.24V
V+
V
out
R2
out
V
=
(1+
R1
R2
)
V
REF
R1
V
REF
LND431LV
>
I
C
L
V
bat
150
Ω
TEST CIRCUIT FOR V = V
KA REF
C
L
R2
R1
V
REF
V
bat
150
Ω
TEST CIRCUIT FOR V = 2 V, 3 V
KA
10 k
Ω
*
*
The Areas under the curves represent conditions that may cause the device to oscillate. For VKA =2V and 3V
curves, R2 and Vbat were adjusted to establish the initial VKA and IK conditions with CL =0. Vbat and CL then were
adjusted to determine the ranges of stability.
