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LT1431 1 1431fe TYPICAL APPLICATION FEATURES DESCRIPTI ON Programma ble 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 T olerance n  0.1Ω T ypical Dynamic Output Impedance n  Fast T urn-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 COLL COMP V + 5V LT1431 GND-F GND-S R TOP REF R MID 2.5V      +      g m  = 4mA/V + SWITCHING REGULATOR V IN 5V + TEMPERATURE (°C) –50     V     R     E     F     (     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 Corporat ion. All other trademarks are the property of their respective owners.

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