UNISONIC TECHNOLOGIES CO., LTD TL431 LINEAR INTEGRATED CIRCUIT PROGRAMMABLE PRECISION REFERENCE 1 . 1 SOT-89 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 36 V with two external resistors. It provides very wide applications, including shunt regulator, series regulator, switching regulator, voltage reference and others. SOP-8 3 3 2 FEATURES TO-92 1 5 1 4 SOT-23 *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. 2 SOT-25 *Pb-free plating product number: TL431K *Pb-free plating product for SOT-23NS type number: TL431NSL ORDERING INFORMATION Order Number Pin Assignment Package Normal Lead Free Plating 1 2 3 4 5 6 7 8 TL431-AB3-R TL431K-AB3-R R A K - - - - SOT-89 TL431-AE3-R TL431K-AE3-R K R A - - - - SOT-23 TL431NS-AE3-R TL431NSL-AE3-R R K A - - - - SOT-23 TL431-AF5-R TL431K-AF5-R X X K R A - - SOT-25 TL431-S08-R TL431K-S08-R K A A X X A A R SOP-8 TL431-S08-T TL431K-S08-T K A A X X A A R SOP-8 TL431-T92-B TL431K-T92-B R A K - - - - TO-92 TL431-T92-K TL431K-T92-K R A K - - - - TO-92 TL431-T92-R TL431K-T92-R R A K - - - - TO-92 Note: Pin Code: K: Cathode A: Anode R: Reference X: No Connection TL431K-AB3-R Packing Tape Reel Tape Reel Tape Reel Tape Reel Tape Reel Tube Tape Box Bulk Tape Reel (1)Packing Type (1) B: Tape Box, K: Bulk, R: Tape Reel, T: Tube (2)Package Type (2) AB3: SOT-89, AE3: SOT-23, AF5: SOT-25, S 08:SOP-8, T92: TO-92 (3) K: Lead Free Plating, Blank: Pb/Sn L : Lead Free Plating, Only for SOT-23NS Type (3)Lead Plating MARKING (SOT-23/SOT-25) 431 For TL431 Lead Plating 431N Lead Plating For TL431NS www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., Ltd 1 of 6 QW-R103-003,R 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 2 of 6 QW-R103-003,R TL431 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified) PARAMETER SYMBOL VKA IKA IREF 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 Power Dissipation PD SOT-89 800 mW SOT-23/SOT-25 300 mW Operating Junction Temperature TJ +150 °C Operating Ambient Temperature 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℃, 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 TEST CONDITIONS VREF VKA=VREF,IKA=10mA VKA=VREF,IKA=10mA ∆VREF/∆T 0°C≦Ta≦70°C ∆VKA=10V~VREF ∆VREF/∆VKA IKA=10mA ∆VKA=36V~10V IREF IKA=10mA, R1=10kΩ, R2=∞ IKA=10mA, R1=10kΩ, R2=∞ ∆IREF/∆T Ta =full Temperature IKA(MIN) VKA=VREF IKA(OFF) VKA=36V, VREF=0 VKA=VREF, IKA=1 to 100mA ZKA f≤1.0kHz UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN TYP MAX UNIT 2.470 2.495 2.520 V 4.5 17 mV -1.0 -0.5 1.5 -2.7 -2.0 4 0.4 1.2 µA 0.45 0.05 1.0 1.0 mA µA 0.15 0.5 Ω mV/V µA 3 of 6 QW-R103-003,R TL431 LINEAR INTEGRATED CIRCUIT ■ TYPICAL CHARACTERISTICS Cathode Current vs . Cathode Voltage Cathode Current vs . Cathode Voltage 800 Ta=25°C VKA =VREF 100 Ta=25°C VKA =VREF 600 Cathode Current (mA) Cathode Current (mA) 125 75 50 25 0 -25 400 IKA(MIN) 200 -50 0 -75 -100 -2 -200 -1 0 1 2 3 -2 -1 0 Cathode Voltage (V) Change in Reference Input Voltage vs . Cathode Voltage IKA=100mA Ta=25°C -15 -20 -25 -30 6 5 4 3 2 1 -35 0 -40 0 5 10 15 20 25 30 35 40 0 1 Dynamic Impedance vs . Frequency 3 4 5 6 7 Small Signal Voltage Amplification vs . Frequency 70 2 10 60 Voltage Amplification (dB) Ta=25°C I KA=0mA to 100mA Impedance (Ω) 2 Time (μs) Cathode Voltage (V) 1 10 10 3 Ta=25°C 7 -5 -10 2 Pulse Response Input and Output Voltage (V) Change In Reference Input Voltage (mV) 0 1 Cathode Voltage (V) 0 Ta=25°C IKA=10mA 50 40 30 20 10 0 -1 10 3 10 4 10 5 10 6 10 7 10 Frequency (Hz) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw -10 3 10 10 4 10 5 10 6 10 7 Frequency (Hz) 4 of 6 QW-R103-003,R TL431 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS (Cont.) 2.52 Reference Voltage 2.51 2.5 2.49 2.48 2.47 2.46 C 0° C 10 80 ° C C 40 ° 60 ° C 20 ° 0° C 0° C -2 -4 0° C 2.45 Temperature 140 Cathode Current, IK (mA) 120 100 80 A VKA =Vref B VKA =5.0V@IK=10mA C VKA=10V@IK =10mA D VKA=15V@IK =10mA Ta=25℃ A B C unstable 60 stable stable 40 D 20 0 100p 1n 10n 100n 1μ 10μ Load Capacitance, CL UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R103-003,R TL431 LINEAR INTEGRATED CIRCUIT TEST CIRCUIT VKA INPUT INPUT VKA IKA VKA INPUT IKA IKA(OFF) R1 IREF UTC TL431 UTC TL431 VREF UTC TL431 VREF R2 VKA=VREF*(1+R1/R2)+IREF*R1 For VKA≧ VREF For VKA=VREF For IKA(OFF) APPLICATION CIRCUIT VIN VIN Vo UT VIN IN UTC7805 OUT COMMON R1 R1 VREF VREF R2 R2 UTC TL431 UTC TL431 Shutdown Regulator VoUT VREF R2 Vo=(1+R1/R2)*VREF Output Control of a Three -Terminal Fixed Regulator VIN R1 UTC TL431 Vo=(1+R1/R2)*VREF Vo=(1+R1/R2)*VREF VoUT VoUT VIN Io Higher-current Shunt Regulator Io VoUT RCL Rs Rs UTC TL431 UTC TL431 IO=VREF/RS Constant-current Sink RS=VREF/RCL 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 6 of 6 QW-R103-003,R