TL431AID STMicroelectronics

TL431 Programmable voltage reference Features Adjustable output voltage: 2.5 to 36 V Sink current capability: 1 to 100 mA Typical output impedance: 0.22 Z TO-92 1% and 2% voltage precision (Plastic package) Description The TL431 is a programmable shunt voltage reference with guaranteed temperature stability over the entire operating temperature range. D The output voltage may be set to any value SO-8 between 2.5 V and 36 V with two external (Batwing plastic micropackage) resistors. The TL431 operates with a wide current range from 1 to 100 mA with a typical dynamic impedance of 0.22 . March 2008 Rev 5 1/15 www.st.com 15Schematic diagrams TL431 1 Schematic diagrams Figure 1. TO-92 pin connections (top view) CathodeAnode Reference 12 3 Figure 2. SO-8 batwing pin connections (top view) 8765 1 - Cathode 2 - Anode 3 - Anode 4 - N.C. 5 - N.C. 6 - Anode 7 - Anode 8 - Reference 1234 Figure 3. TL431 block diagram CathodeCathode VrefVref ++ -- VrefVref AnodeAnode 2/15