LT1431 Programmable Reference Fea T Descrip T n Guaranteed 0.4% Initial Voltage Tolerance The LT 1431 is an adjustable shunt voltage regulator n 0.1 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 any value between 2.5V and 36V. The nominal internal a T current limit of 100mA may be decreased by including n Linear Regulators one external resistor. n Adjustable Power Supplies A simplified 3-pin version, the LT1431CZ/LT1431IZ, is n 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 a T Isolated 5V Regulator + 5V + SWITCHING V IN REGULATOR V vs Temperature REF 2.5025 2.5000 2.4975 5V 2.4950 + R TOP V COMP COLL 2.4925 REF 2.4900 g = m 4mA/V 2.4875 50 25 0 25 50 75 100 125 R MID TEMPERATURE (C) LT1431 TA01b 2.5V LT1431 GND-S GND-F LT1431 TA01 1431fe 1 V (V) REF + ion pplica ions pplica ion uresLT1431 a Te Maxi Mu M r a T (Note 1) + V , V ..........................................................36V Junction Temperature Range COLLECTOR V , R , R , V .............................................6V LT1431M, LT1431MP ......................... 55C to 150C COMP TOP MID REF GND-F to GND-S ......................................................0.7V LT1431I .............................................. 40C to 100C Ambient Temperature Range LT1431C ................................................. 0C to 100C LT1431M, LT1431MP ......................... 55C to 125C Storage Temperature Range .................. 65C to 150C LT1431I ................................................40C to 85C Lead Temperature (Soldering, 10 sec) ...................300C LT1431C ..................................................0C TO 70C p in c F T TOP VIEW TOP VIEW COLLECTOR 1 8 REF COLLECTOR 1 8 REF COMP 2 R COMP 2 R 7 7 MID MID + + V 3 6 GND-F V 3 6 GND-F R 4 5 GND-S R 4 5 GND-S TOP TOP J8 PACKAGE N8 PACKAGE 8-LEAD CERDIP 8-LEAD PLASTIC DIP T = 150C, = 100C/W T = 100C, = 130C/W JMAX JA JMAX JA TOP VIEW BOTTOM VIEW COLLECTOR 1 8 REF REF ANODE COMP 2 7 R MID CATHODE + V 3 6 GND-F R 4 5 GND-S TOP Z PACKAGE S8 PACKAGE 8-LEAD PLASTIC SO 3-LEAD TO-92 PLASTIC T = 100C, = 170C/W T = 100C, = 150C/W JMAX JA JMAX JA o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT1431CN8 PBF LT1431CN8 TRPBF LT1431 CN8 8-Lead Plastic DIP 0C to 70C LT1431IN8 PBF LT1431IN8 TRPBF LT1431 IN8 8-Lead Plastic DIP 40C to 85C LT1431CS8 PBF LT1431CS8 TRPBF LT1431 8-Lead Plastic SO 0C to 70C LT1431IS8 PBF LT1431IS8 TRPBF LT1431I 8-Lead Plastic SO 40C to 85C LT1431MPS8 PBF LT1431MPS8 TRPBF LT1431 8-Lead Plastic SO 55C to 125C LT1431MJ8 PBF LT1431MJ8 TRPBF LT1431 MJ8 8-Lead CERDIP 55C to 125C LT1431CZ PBF LT1431CZ TRPBF LT1431 CZ 3-Lead TO-92 Plastic 0C to 70C LT1431IZ PBF LT1431IZ TRPBF LT1431 IZ 3-Lead TO-92 Plastic 40C to 85C 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: