UNISONIC TECHNOLOGIES CO., LTD TL431 LINEAR INTEGRATED CIRCUIT 4PROGRAMMABLE 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 VREF (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 0.2. Sink current capability of 1.0 to 100mA. Equivalent full-range temperature coefficient of 50ppm/ 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 TL431K-AB3-R TL431G-AB3-R SOT-89 R A K TL431K-AE2-R TL431G-AE2-R SOT-23-3 K R A TL431K-AE3-R TL431G-AE3-R SOT-23 K R A TL431NSL-AE3-R TL431NSG-AE3-R SOT-23 R K A TL431NSL-AE2-R TL431NSG-AE2-R SOT-23-3 R K A TL431K-AF5-R TL431G-AF5-R SOT-25 X X K R A TL431K-S08-R TL431G-S08-R SOP-8 K A A X X A A TL431K-S08-T TL431G-S08-T SOP-8 K A A X X A A TL431K-T92-B TL431G-T92-B TO-92 R A K TL431K-T92-K TL431G-T92-K TO-92 R A K TL431K-T92-R TL431G-T92-R TO-92 R A K Note: Pin Code: K: Cathode A: Anode R: Reference X: No Connection www.unisonic.com.tw Copyright (c) 2011 Unisonic Technologies Co., Ltd 8 R R - Packing Tape Reel Tape Reel Tape Reel Tape Reel Tape Reel Tape Reel Tape Reel Tube Tape Box Bulk Tape Reel 1 of 7 QW-R103-003.AF TL431 LINEAR INTEGRATED CIRCUIT MARKING PACKAGE MARKING 3 SOT-23-3 SOT-23 431. 2 K: Lead Free G: Halogen Free 1 3 SOT-23-3 SOT-23 (TL431NS) 431N L: Lead Free G: Halogen Free 2 1 5 4 431 SOT-25 1 2 K: Lead Free G: Halogen Free 3 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 7 QW-R103-003.AF TL431 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM CATHODE REFERENCE CATHODE (K) REFERENCE (R) 2.5V VREF ANODE(A) ANODE UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 7 QW-R103-003.AF TL431 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies, unless otherwise specified) PARAMETER RATINGS UNIT Cathode Voltage 37 V Cathode Current Range(Continuous) -100 ~ +150 mA Reference Input Current Range -0.05 ~ +10 mA TO-92 770 mW SOT-89 800 mW Power Dissipation PD SOT-23/SOT-23-3/SOT-25 300 mW SOP-8 600 mW Operating Junction TJ +150 C Operating Ambient TOPR -40 ~ +85 C Storage Temperature TSTG -65 ~ +150 C Note: 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. SYMBOL VKA IKA IREF RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL VKA IKA Cathode Voltage Cathode Current MIN VREF 1 TYP MAX 36 100 UNIT V mA ELECTRICAL CHARACTERISTICS (TC= 25C, unless otherwise specified.) PARAMETER Reference Input Voltage SYMBOL VREF Deviation of reference Input Voltage Over VREF T temperature VREF Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage VKA Reference Input Current IREF Deviation of Reference Input Current Over IREF T Full Temperature Range Minimum Cathode Current for Regulation IKA(MIN) Off-State Cathode Current IKA(OFF) Dynamic Impedance ZKA TEST CONDITIONS TL431-A TL431-1 VKA=VREF,IKA=10mA TL431-2 TL431-3 VKA=VREF,IKA=10mA, 0C TA70C VKA=10V~VREF IKA=10mA VKA=36V~10V IKA=10mA, R1=10k, R2= IKA=10mA, R1=10k, R2=, TA =full Temperature VKA=VREF VKA=36V, VREF=0 VKA=VREF, IKA=1~ 100mA,f1.0kHz UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN TYP MAX UNIT 2.483 2.495 2.507 V 2.470 2.495 2.520 V 2.520 2.545 V 2.445 2.470 V 4.5 17 mV -1.0 -0.5 1.5 -2.7 mV/V -2.0 mV/V 4 A 0.4 1.2 A 0.3 0.05 0.15 0.5 1.0 0.5 mA A 4 of 7 QW-R103-003.AF TL431 LINEAR INTEGRATED CIRCUIT TEST CIRCUIT VKA INPUT IKA UTC TL431 VREF VKA=VREFx(1+R1/R2)+IREFxR1 For VKAVREF For VKA=VREF For IKA(OFF) APPLICATION CIRCUIT VOUT=(1+R1/R2)xVREF Minimum VOUT=VREF+5V Output Control of a Three -Terminal Fixed Regulator VOUT=(1+R1/R2)xVREF Shutdown Regulator VIN VOUT VIN IOUT VOUT=(1+R1/R2)xVREF Higher-current Shunt Regulator IOUT VOUT RCL RS RS UTC TL431 IOUT=VREF/RS Constant-current Sink UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw UTC TL431 IOUT =VREF/RCL Current Limiting or Current Source 5 of 7 QW-R103-003.AF TL431 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS Cathode Current vs. Cathode Voltage Change In Reference Input Voltage (mV) Cathode Current (A) TA=25C 125 V =V KA REF 100 75 50 25 0 -25 -50 -75 -100 -2 0 -5 -1 0 1 2 Cathode Voltage (V) Change in Reference Input Voltage vs. Cathode Voltage IKA=10mA TA=25C -25 -30 -35 15 20 25 30 35 40 Cathode Voltage (V) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 400 IKA(MIN ) 200 0 -1 0 1 2 Cathode Voltage (V) 3 Pulse Response -20 10 600 7 -15 5 TA=25C VKA=VREF -200 -2 3 -10 -40 0 Cathode Current vs. Cathode Voltage 800 Input and Output Voltage (V) Cathode Current (mA) 150 6 TA=25C 5 4 3 2 1 0 -1 -1 0 1 2 3 4 Time (s) 5 6 7 6 of 7 QW-R103-003.AF TL431 LINEAR INTEGRATED CIRCUIT 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. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 7 QW-R103-003.AF