UNISONIC TECHNOLOGIES CO., LTD TL431 LINEAR INTEGRATED CIRCUIT 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 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 0.2Ω. * Sink current capability of 1.0 to 100mA. * Equivalent full-range temperature coefficient of 50ppm/°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 TL431G-AB3-R SOT-89 R A K TL431G-AE2-R SOT-23-3 K R A TL431G-AE3-R SOT-23 K R A TL431NSG-AE3-R SOT-23 R K A TL431NSG-AE2-R SOT-23-3 R K A TL431G-AF5-R SOT-25 X X K R A TL431G-S08-R SOP-8 K A A X X A A TL431G-G03-K SIP-3 R A K TL431K-T92-B TL431G-T92-B TO-92 R A K TL431K-T92-K TL431G-T92-K TO-92 R A K Note: Pin Code: K: Cathode A: Anode R: Reference X: No Connection www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 8 R - Packing Tape Reel Tape Reel Tape Reel Tape Reel Tape Reel Tape Reel Tape Reel Bulk Tape Box Bulk 1 of 6 QW-R103-003.AI TL431 LINEAR INTEGRATED CIRCUIT MARKING PACKAGE MARKING PACKAGE SOT-23-3 SOT-23 (TL431) MARKING SOP-8 3 SOT-23-3 SOT-23 (TL431NS) 431NG SIP-3 2 1 5 4 431G SOT-25 1 2 TO-92 3 SOT-89 PIN CONFIGURATION(For SOP-8) BLOCK DIAGRAM CATHODE REFERENCE CATHODE (K) REFERENCE (R) 2.5V VREF ANODE(A) ANODE UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R103-003.AI TL431 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies, unless otherwise specified) PARAMETER SYMBOL VKA IKA IREF RATINGS 37 -100 ~ +150 -0.05 ~ +10 770 800 UNIT V mA mA mW mW Cathode Voltage Cathode Current Range(Continuous) Reference Input Current Range TO-92 SOT-89 SOT-23/SOT-23-3 300 mW Power Dissipation PD SOT-25 SIP-3 400 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. RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL VKA IKA Cathode Voltage Cathode Current MIN VREF 1 TYP MAX 36 100 UNIT V mA ELECTRICAL CHARACTERISTICS (TC= 25°C, unless otherwise specified.) PARAMETER Reference Input Voltage Deviation of reference Input Voltage Over temperature Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off-State Cathode Current Dynamic Impedance SYMBOL VREF ∆VREF ∆T ∆VREF ∆VKA IREF ∆IREF ∆T IKA(MIN) IKA(OFF) ZKA TEST CONDITIONS TL431-A TL431-1 VKA=VREF,IKA=10mA TL431-2 TL431-3 VKA=VREF,IKA=10mA, 0°C ≤TA≤70°C VKA=10V~VREF IKA=10mA VKA=36V~10V IKA=10mA, R1=10kΩ, R2=∞ IKA=10mA, R1=10kΩ, R2=∞, TA =full Temperature VKA=VREF VKA=36V, VREF=0 VKA=VREF, IKA=1~ 100mA,f≤1.0kHz 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 µA 0.4 1.2 µA 0.3 0.05 0.15 0.5 1.0 0.5 mA µA Ω 3 of 6 QW-R103-003.AI TL431 LINEAR INTEGRATED CIRCUIT TEST CIRCUIT VKA INPUT IKA UTC TL431 VREF VKA=VREF×(1+R1/R2)+IREF×R1 For VKA≥VREF For VKA=VREF For IKA(OFF) APPLICATION CIRCUIT VOUT=(1+R1/R2)×VREF Minimum VOUT=VREF+5V Output Control of a Three -Terminal Fixed Regulator VOUT=(1+R1/R2)×VREF Shutdown Regulator VIN VOUT VIN IOUT VOUT=(1+R1/R2)×VREF 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 4 of 6 QW-R103-003.AI TL431 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS ■ Cathode Current vs. Cathode Voltage Change In Reference Input Voltage (mV) Cathode Current (μA) TA=25°C 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=25°C -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=25°C 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=25°C 5 4 3 2 1 0 -1 -1 0 1 2 3 4 Time (µs) 5 6 7 5 of 6 QW-R103-003.AI 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 6 of 6 QW-R103-003.AI