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LT1431
1
1431fe
Typical applicaTion
FeaTures DescripTion
Programmable Reference
The LT
®
1431 is an adjustable shunt voltage regulator
with 100mA sink capability, 0.4% initial reference voltage
tolerance and 0.3% typical temperature stability. On-chip
divider resistors allow the LT1431 to be configured as a
5V shunt regulator, with 1% initial voltage tolerance and
requiring no additional external components. By adding
two external resistors, the output voltage may be set to
any value between 2.5V and 36V. The nominal internal
current limit of 100mA may be decreased by including
one external resistor.
A simplified 3-pin version, the LT1431CZ/LT1431IZ, is
available for applications as an adjustable reference and
is pin compatible with the TL431.
Isolated 5V Regulator
applicaTions
n
Guaranteed 0.4% Initial Voltage Tolerance
n
0.1Ω Typical Dynamic Output Impedance
n
Fast Turn-On
n
Sink Current Capability, 1mA to 100mA
n
Low Reference Pin Current
n
Available in J8, N8, S8 or 3-Lead TO-92 Z Packages
n
Linear Regulators
n
Adjustable Power Supplies
n
Switching Power Supplies
V
REF
vs Temperature
LT1431 TA01
COLLCOMPV
+
5V
LT1431
GND-FGND-S
R
TOP
REF
R
MID
2.5V
+
–
g
m
=
4mA/V
+
SWITCHING
REGULATOR
–
V
IN
5V
+
TEMPERATURE (°C)
–50
V
REF
(V)
2.4975
2.5000
2.5025
25 75
LT1431 TA01b
2.4950
2.4925
–25 0
50 100 125
2.4900
2.4875
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
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