UNISONIC TECHNOLOGIES CO., LTD TL431 PROGRAMMABLE PRECISION REFERENCE DESCRIPTION The UTC TL431 is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between V REF (approximately 2.5V) and 36V with two external resistors. It provides very wide applications, including shunt regulator, series regulator, switching regulator, voltage reference and others. FEATURES * Programmable output Voltage to 36V. * Low dynamic output impedance.2ω. * Sink current capability of 1. to 1mA. * Equivalent full-range temperature coefficient of 5ppm/ C typical for operation over full rated operating temperature range. ORDERING INFORMATION Ordering Number Pin Assignment Package Lead Free Halogen Free 1 2 3 4 5 6 7 8 Packing TL431K-AB3-R TL431G-AB3-R SOT-89 R A K - - - - - Tape Reel TL431K-AE2-R TL431G-AE2-R SOT-23-3 K R A - - - - - Tape Reel TL431K-AE3-R TL431G-AE3-R SOT-23 K R A - - - - - Tape Reel TL431NSL-AE3-R TL431NSG-AE3-R SOT-23 R K A - - - - - Tape Reel TL431NSL-AE2-R TL431NSG-AE2-R SOT-23-3 R K A - - - - - Tape Reel TL431NSL-AH3-R TL431NSG-AH3-R TSOT-23 R K A - - - - - Tape Reel TL431K-AF5-R TL431G-AF5-R SOT-25 X X K R A - - - Tape Reel TL431K-AF5-B-R TL431G-AF5-B-R SOT-25 X A X K R - - - Tape Reel TL431K-AF5-C-R TL431G-AF5-C-R SOT-25 R A K X X - - - Tape Reel TL431K-S8-R TL431G-S8-R SOP-8 K A A X X A A R Tape Reel TL431K-K3-K TL431G-G3-K SIP-3 R A K - - - - - Bulk TL431K-T92-B TL431G-T92-B TO-92 R A K - - - - - Tape Box TL431K-T92-K TL431G-T92-K TO-92 R A K - - - - - Bulk Note: Pin Code: K: Cathode A: Anode R: Reference X: No Connection 1 of 6 Copyright 218 Unisonic Technologies Co., Ltd
MARKING PACKAGE MARKING PACKAGE MARKING SOT-23-3 SOT-23 (TL431) SOP-8 SOT-23-3 SOT-23 TSOT-23 (TL431NS) SIP-3 SOT-25 SOT-25 (Pin B, C) SOT-89 TO-92 PIN CONFIGURATION (For SOP-8) BLOCK DIAGRAM REFERENCE CATHODE CATHODE (K) REFERENCE (R) 2.5V VREF ANODE(A) ANODE UNISONIC TECHNOLOGIES CO., LTD 2 of 6
ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Cathode Voltage V KA 37 V Cathode Current Range(Continuous) I KA -1 ~ +15 ma Reference Input Current Range I REF -.5 ~ +1 ma TO-92 77 mw SOT-89 8 mw Power Dissipation SOT-23/SOT-23-3 TSOT-23/SOT-25 P D 3 mw SIP-3 4 mw SOP-8 6 mw Operating Junction T J +15 C Operating Ambient (Note 2) T OPR -4 ~ +125 C Storage Temperature T STG -65 ~ +15 C Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 2. It is guarantee by design, not 1% be tested. RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN TYP MAX UNIT Cathode Voltage V KA V REF 36 V Cathode Current I KA 1 1 ma ELECTRICAL CHARACTERISTICS (T C = 25 C, unless otherwise specified.) Reference Input Voltage PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT TL431-A (±.5%) 2.483 2.495 2.57 V V REF V KA =V REF, I KA =1mA TL431-1 (±1%) 2.47 2.495 2.52 V TL431-2 (+2%) 2.52-2.545 V TL431-3 (-2%) 2.445-2.47 V Deviation of reference Input Voltage Over VREF V KA =V REF,I KA =1mA, temperature T C T A 7 C 4.5 17 mv Ratio of Change in Reference Input VREF V KA =1V~V REF -1. -2.7 mv/v I KA =1mA Voltage to the Change in Cathode Voltage VKA V KA =36V~1V -.5-2. mv/v Reference Input Current I REF I KA =1mA, R1=1kΩ, R2= 1.5 4 µa Deviation of Reference Input Current Over IREF I KA =1mA, R1=1kΩ, R2=, Full Temperature Range T T A =full Temperature.4 1.2 µa Minimum Cathode Current for Regulation I KA(MIN) V KA =V REF.3.5 ma Off-State Cathode Current I KA(OFF) V KA =36V, V REF =.5 1. µa Dynamic Impedance Z KA V KA =V REF, I KA =1~ 1mA,f 1.kHz.15.5 Ω UNISONIC TECHNOLOGIES CO., LTD 3 of 6
TEST CIRCUIT INPUT V KA I KA UTC TL431 V REF V KA =V REF (1+R 1 /R 2 )+I REF R 1 For V KA =V REF For V KA V REF For I KA(OFF) APPLICATION CIRCUIT V OUT =(1+R 1 /R 2 ) V REF Shutdown Regulator V OUT =(1+R 1 /R 2 ) V REF Minimum V OUT =V REF +5V Output Control of a Three -Terminal Fixed Regulator V OUT =(1+R 1 /R 2 ) V REF Higher-current Shunt Regulator V IN I OUT V OUT V IN I OUT V OUT R CL R S UTC TL431 R S UTC TL431 I OUT =V REF /R S Constant-current Sink I OUT =V REF /R CL Current Limiting or Current Source UNISONIC TECHNOLOGIES CO., LTD 4 of 6
TYPICAL CHARACTERISTICS Cathode Current (ma) Cathode Current vs. Cathode Voltage 15 TA =25 C 125 1 75 5 25-25 -5 V KA =V REF -75-1 -2-1 1 2 3 Cathode Voltage (V) Cathode Current (μa) 8 6 4 2-2 -2 Cathode Current vs. Cathode Voltage T A =25 C V KA =V REF I KA(MIN ) -1 1 2 3 Cathode Voltage (V) Change In Reference Input Voltage (mv) -5-1 -15-2 -25-3 -35 Change in Reference Input Voltage vs. Cathode Voltage I KA =1mA T A =25 C -4 5 1 15 2 25 3 35 4 Cathode Voltage (V) Input and Output Voltage (V) Pulse Response 7 T A =25 C 6 5 4 3 2 1-1 -1 1 2 3 4 5 6 7 Time (µs) UNISONIC TECHNOLOGIES CO., LTD 5 of 6
UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. UTC reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof. UNISONIC TECHNOLOGIES CO., LTD 6 of 6