Datasheet

LT1431
3
1431fe
elecTrical characTerisTics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: V
KA
is the cathode voltage of the LT1431CZ/IZ and corresponds
to V
+
of the LT1431CN8/IN8/CS8/IS8. I
K
is the cathode current of the
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. I
K
= 10mA unless otherwise specified (Note 2)
SYMBOL PARAMETER CONDITIONS
LT1431I, LT1431M LT1431C
UNITSMIN TYP MAX MIN TYP MAX
V
REF
Reference Voltage V
KA
= 5V, I
K
= 2mA, (Note 3)
l
2.490
2.465
2.500 2.510
2.535
2.490
2.480
2.500 2.510
2.520
V
V
∆V
REF
/∆T Reference Drift V
KA
= 5V, I
K
= 2mA
l
50 30 ppm/°C
∆V
REF
/∆V
KA
Voltage Ratio, Reference to
Cathode (Open-Loop Gain)
I
K
= 2mA, V
KA
= 3V to 36V
l
0.2 0.5 0.2 0.5 mV/V
|I
REF
| Reference Input Current V
KA
= 5V, T
A
= 25°C
l
0.2 1.0
1.5
0.2 1.0
1.2
µA
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
l
1
15
1
2
µA
µA
|I
LEAK
| Off-State Collector Leakage Current V
COLL
= 36V, V
+
= 5V, V
REF
= 2.4V
l
1
5
1
2
µA
µA
|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
l
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
LT1431CZ/IZ and corresponds to I(V
+
) + I
COLLECTOR
of the LT1431CN8/
IN8/CS8/IS8.
Note 3: 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
.