2
LT1431
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
V+, V
COLLECTOR
....................................................... 36V
V
COMP
, R
TOP
,R
MID
,V
REF
............................................ 6V
GND-F to GND-S.................................................... 0.7V
Ambient Temperature Range
LT1431M ........................................ –55°C to 125°C
LT1431I ............................................ –40°C to 85°C
LT1431C .............................................. 0°C TO 70°C
JunctionTemperature Range
LT1431M ........................................ –55°C to 150°C
LT1431I .......................................... –40°C to 100°C
LT1431C ............................................. 0°C to 100°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
LT1431CZ
LT1431IZ
ORDER PART
NUMBER
LT1431CS8
LT1431IS8
LT1431
LT1431I
ORDER PART
NUMBER
PART
MARKING
LT1431M/I LT1431C
T
A
= 25°C, I
K
= 10mA, unless otherwise specified (Note 1).
The ● denotes specifications which apply over the operating temperature
range.
Note 1: V
KA
is the cathode voltage of the LT1431CZ/IZ and corresponds to
V
+
of the LT1431CN8/MJ8. I
K
is the cathode current of the LT1431CZ/IZ
and corresponds to I(V
+
) + I
COLLECTOR
of the LT1431CN8/MJ8/IN8.
Note 2: The LT1431 has bias current cancellation which is effective only
for V
KA
≥ 3V. A slight (≈2mV) shift in reference voltage occurs when
V
KA
drops below 3V. For this reason, these tests are not performed at
V
KA
= V
REF
.
ELECTRICAL CHARACTERISTICS
LT1431MJ8
LT1431CN8
LT1431IN8
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
1
2
3
4
8
7
6
5
TOP VIEW
COLLECTOR
COMP
V
+
R
TOP
REF
R
MID
GND-F
GND-S
N8 PACKAGE
8-LEAD PLASTIC DIP
J8 PACKAGE
8-LEAD CERAMIC DIP
T
J MAX
= 150°C, θ
JA
= 100°C/W (J)
T
J MAX
= 100°C, θ
JA
= 130°C/W (N)
1
2
3
4
8
7
6
5
TOP VIEW
REF
R
MID
GND-F
GND-S
COMP
V
+
R
TOP
S8 PACKAGE
8-LEAD PLASTIC SOIC
COLLECTOR
T
J MAX
= 100°C, θ
JA
= 170°C/W
12
3
BOTTOM VIEW
REF ANODE
Z PACKAGE
3-LEAD TO-92 PLASTIC
CATHODE
T
J MAX
= 100°C, θ
JA
= 160°C/W
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
V
REF
Reference Voltage V
KA
= 5V, I
K
= 2mA, (Note 2) 2.490 2.500 2.510 2.490 2.500 2.510 V
● 2.465 2.535 2.480 2.520 V
∆V
REF
/∆T Reference Drift V
KA
= 5V, I
K
= 2mA ● 50 30 ppm/°C
∆V
REF
/∆V
KA
Voltage Ratio, Reference to I
K
= 2mA, V
KA
= 3V to 36V ● 0.2 0.5 0.2 0.5 mV/V
Cathode (Open-Loop Gain)
|I
REF
| Reference Input Current V
KA
= 5V, T
A
= 25°C 0.2 1.0 0.2 1.0 µA
● 1.5 1.2 µA
I
MIN
Minimum Operating Current V
KA
= V
REF
to 36V 0.6 1.0 0.6 1.0 mA
|I
OFF
| Off-State Cathode Current V
KA
= 36V, V
REF
= 0V 1 1 µA
● 15 2 µA
|I
LEAK
| Off-State Collector Leakage Current V
COLL
= 36V, V
+
= 5V, V
REF
= 2.4V 1 1 µA
● 52µA
|Z
KA
| Dynamic Impedance V
KA
= V
REF
, I
K
= 1mA to 100mA, f ≤ 1kHz 0.2 0.2 Ω
I
LIM
Collector Current Limit V
KA
= V
REF
+ 50mV ● 80 360 100 260 mA
5V Reference Output Internal Divider Used, I
K
= 2mA 4.950 5.000 5.050 4.950 5.000 5.050 V
