Datasheet LT1431 (Analog Devices)

LT1431 Programmable Reference
FeaTures DescripTion
n
Guaranteed 0.4% Initial Voltage Tolerance
The LT®1431 is an adjustable shunt voltage regulator n
0.1Ω Typical Dynamic Output Impedance
with 100mA sink capability, 0.4% initial reference voltage n Fast Turn-On tolerance and 0.3% typical temperature stability. On-chip n Sink Current Capability, 1mA to 100mA divider resistors allow the LT1431 to be configured as a n Low Reference Pin Current 5V shunt regulator, with 1% initial voltage tolerance and n Available in J8, N8, S8 or 3-Lead TO-92 Z Packages requiring no additional external components. By adding two external resistors, the output voltage may be set to
applicaTions
any value between 2.5V and 36V. The nominal internal current limit of 100mA may be decreased by including n Linear Regulators one external resistor. n Adjustable Power Supplies n A simplified 3-pin version, the LT1431CZ/LT1431IZ, is Switching Power Supplies available for applications as an adjustable reference and 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 is pin compatible with the TL431. of their respective owners.
Typical applicaTion Isolated 5V Regulator
+ 5V + SWITCHING VIN REGULATOR
VREF vs Temperature
2.5025 2.5000 – 2.4975 5V (V) 2.4950 RTOP V+ COMP COLL V REF 2.4925 REF + 2.4900 gm = 4mA/V – 2.4875 R –50 –25 0 25 50 75 100 125 MID TEMPERATURE (°C) LT1431 TA01b 2.5V LT1431 GND-S GND-F LT1431 TA01 1431fe 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Schematic Diagram Package Description Revision History Package Description Related Parts