UNISONIC TECHNOLOGIES CO., LTD TL431L LINEAR INTEGRATED CIRCUIT PROGRAMMABLE PRECISION REFERENCE DESCRIPTION The UTC TL431L 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 20V 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 20V. *Low dynamic output impedance 0.2Ω. *Sink current capability of 1.0 ~ 100mA. *Equivalent full-range temperature coefficient of 50ppm/ °C typical for operation over full rated operating temperature range. *Pb-free plating product number: TL431LK ORDERING INFORMATION Order Number Pin Assignment Package Normal Lead Free Plating 1 2 3 4 5 6 7 8 TL431L-AB3-6-R TL431LK-AB3-6-R R A K - - - - SOT-89 TL431L-AE3-3-R TL431LK-AE3-3-R K R A - - - - SOT-23 TL431L-AF5-0-R TL431LK-AF5-0-R X X K R A - - SOT-25 TL431L-S08-0-R TL431LK-S08-0-R K A A X X A A R SOP-8 TL431L-S08-0-T TL431LK-S08-0-T K A A X X A A R SOP-8 TL431L-SM1-0-R TL431LK-SM1-0-R K X X X X A X R MSOP-8 TL431L-SM1-0-T TL431LK-SM1-0-T K X X X X A X R MSOP-8 TL431L-T92-6-B TL431LK-T92-6-B R A K - - - - TO-92 TL431L-T92-6-K TL431LK-T92-6-K R A K - - - - TO-92 TL431L-T92-6-R TL431LK-T92-6-R R A K - - - - TO-92 Note: Pin Code: K: Cathode A: Anode R: Reference X: No Connection www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., Ltd Packing Tape Reel Tape Reel Tape Reel Tape Reel Tube Tape Reel Tube Tape Box Bulk Tape Reel 1 of 5 QW-R103-014,E TL431L LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R103-014,E TL431L LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Cathode Voltage VKA 20 V Cathode Current Range (Continuous) IKA -100 ~ +150 mA Reference Input Current Range IREF -0.05 ~ +10 mA Operating Junction Temperature TJ 150 °C Operating Ambient Temperature TOPR 0 ~ +70 °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 Cathode Voltage Cathode Current SYMBOL VKA IKA MIN VREF 1 TYP MAX 20 100 UNIT V mA ELECTRICAL CHARACTERISTICS (Ta=25°C, unless otherwise specified) PARAMETER SYMBOL Reference Input Voltage VREF Deviation of Reference Input Voltage ΔVREF/ΔT Over temperature (note 1) Ratio of Change in Reference Input Voltage to the Change in Cathode ΔVREF /ΔVKA Voltage Reference Input Current IREF Deviation of Reference Input Current ΔIREF/ΔT Over Full Temperature Range Minimum Cathode Current for Regulation IKA(MIN) Off-State Cathode Current IKA(OFF) TEST CONDITIONS VKA=VREF, IKA=10mA VKA=VREF, IKA=10mA 0≤TA≤70 IKA=10mA ΔVKA=10V~VREF ΔVKA=20V~10V IKA=10mA, R1=10kΩ, R2=∞ IKA=10mA, R1=10kΩ, R2=∞ TA=full Temperature VKA=VREF VKA=20V, VREF=0 VKA=VREF, IKA=1 ~ 100mA Dynamic Impedance ZKA f≤1.0kHz Remark: Reference voltage of ±1% tolerance is also available per customer’s request. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 2.450 TYP 2.50 MAX 2.550 UNIT V 4.5 17 mV -1.0 -0.5 -2.7 -2.0 mV/V 1.5 4 μA 0.4 1.2 μA 0.45 0.05 1.0 1.0 mA μA 0.15 0.5 Ω 3 of 5 QW-R103-014,E TL431L LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS Cathode Current vs. Cathode Voltage Ta=25℃ VKA=VREF 125 Ta=25℃ VKA=VREF 100 600 Cathode Current (mA) Cathode Current (mA) Cathode Current vs. Cathode Voltage 800 75 50 25 0 -25 -50 400 IKA(min) 200 0 -75 -100 -2 -200 -1 0 1 2 3 -1 -2 Cathode Voltage (V) Change in Reference Input Voltage vs. Cathode voltage 0 Input and Output Voltage (V) -10 -15 -20 -25 -30 5 4 3 2 IKA=100mA Ta=25℃ 1 0 0 5 10 15 20 25 30 35 40 0 1 Cathode Voltage (V) Voltage Amplification (dB) Impedance (Ω) 5 6 7 60 1 0 50 40 30 20 10 0 -1 10 4 Small Signal Voltage Amplification vs. Frequency 2 10 3 70 Ta=25℃ IKA=0mA ~ 100mA 10 2 Time (μs) Dynamic Impedance vs. Frequency 10 3 6 -40 10 2 Ta=25℃ 7 -35 1 Pulse Response -5 Change In Reference INput Voltage (mV) 0 Cathode Voltage (V) 3 10 4 10 5 10 6 10 7 Frequency (Hz) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw -10 3 10 Ta=25℃ IKA=10mA 10 4 10 5 10 6 10 7 Frequency (Hz) 4 of 5 QW-R103-014,E TL431L LINEAR INTEGRATED CIRCUIT TEST CIRCUIT APPLICATION CIRCUIT VIN VOUT IOUT VIN IOUT VOUT RCL Rs Rs UTC TL431L IOUT=VREF/RS UTC TL431L RS=VREF/RCL Constant-Current Sink Current Limiting or Current Source 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 5 of 5 QW-R103-014,E