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Linear Technology Electronic Components Datasheet

LT1431 Datasheet

Programmable Reference

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LT1431
Programmable Reference
Features
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
Applications
n Linear Regulators
n Adjustable Power Supplies
n Switching Power Supplies
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.
Typical Application
Isolated 5V Regulator
+
+
5V
Description
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.
VIN
SWITCHING
REGULATOR
5V
REF
RMID
RTOP
V+ COMP
+
gm =
4mA/V
2.5V
GND-S
LT1431
COLL
GND-F
LT1431 TA01
2.5025
VREF vs Temperature
2.5000
2.4975
2.4950
2.4925
2.4900
2.4875
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
LT1431 TA01b
1431fe
1


Linear Technology Electronic Components Datasheet

LT1431 Datasheet

Programmable Reference

No Preview Available !

LT1431
Absolute Maximum Ratings (Note 1)
V+, VCOLLECTOR...........................................................36V
VCOMP, RTOP, RMID, VREF..............................................6V
GND-F to GND-S.......................................................0.7V
Ambient Temperature Range
LT1431M, LT1431MP.......................... –55°C to 125°C
LT1431I.................................................–40°C to 85°C
LT1431C...................................................0°C TO 70°C
Junction Temperature Range
LT1431M, LT1431MP.......................... –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
Pin Configuration
TOP VIEW
COLLECTOR 1
COMP 2
V+ 3
RTOP 4
8 REF
7 RMID
6 GND-F
5 GND-S
J8 PACKAGE
8-LEAD CERDIP
TJMAX = 150°C, θJA = 100°C/W
TOP VIEW
COLLECTOR 1
COMP 2
V+ 3
RTOP 4
8 REF
7 RMID
6 GND-F
5 GND-S
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 100°C, θJA = 170°C/W
TOP VIEW
COLLECTOR 1
COMP 2
V+ 3
RTOP 4
8 REF
7 RMID
6 GND-F
5 GND-S
N8 PACKAGE
8-LEAD PLASTIC DIP
TJMAX = 100°C, θJA = 130°C/W
BOTTOM VIEW
REF ANODE
CATHODE
Z PACKAGE
3-LEAD TO-92 PLASTIC
TJMAX = 100°C, θJA = 150°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1431CN8#PBF
LT1431CN8#TRPBF
LT1431 CN8
8-Lead Plastic DIP
LT1431IN8#PBF
LT1431IN8#TRPBF
LT1431 IN8
8-Lead Plastic DIP
LT1431CS8#PBF
LT1431CS8#TRPBF
LT1431
8-Lead Plastic SO
LT1431IS8#PBF
LT1431IS8#TRPBF
LT1431I
8-Lead Plastic SO
LT1431MPS8#PBF
LT1431MPS8#TRPBF
LT1431
8-Lead Plastic SO
LT1431MJ8#PBF
LT1431MJ8#TRPBF
LT1431 MJ8
8-Lead CERDIP
LT1431CZ#PBF
LT1431CZ#TRPBF
LT1431 CZ
3-Lead TO-92 Plastic
LT1431IZ#PBF
LT1431IZ#TRPBF
LT1431 IZ
3-Lead TO-92 Plastic
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
2
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
–55°C to 125°C
–55°C to 125°C
0°C to 70°C
–40°C to 85°C
1431fe


Part Number LT1431
Description Programmable Reference
Maker Linear
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LT1431 Datasheet PDF






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