CYStech Electronics Corp. Spec. No. : C502M3 Issued Date : 2003.04.02 Revised Date : 2005.04.20 Page No. : 1/5 Adjustable Precision Shunt Regulators TL431XM3 SOT-89 Description The TL431XM3 series are three-terminal adjustable regulators with guaranteed thermal stability over applicable temperature range. The output voltage may be set to any value between VREF (approximately 2.495 volts) and 36 volts with two external resistors. These devices have a typical dynamic output impedance of 0.2Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacement for zener diodes in many applications. Features • Programmable output voltage • Temperature coefficient is 50ppm/°C typical • Temperature compensated for operation over full temperature range • Low output noise voltage • Fast turn on response Classification Rank VREF A B C 2.495±0.5% 2.495±1% 2.495±2% Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified) Characteristics Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Power Dissipation Operating Temperature Range Storage Temperature Range TL431M3 Symbol VKA IK IREF PD Topr Tstg Value 37 -100~+150 0.05~+10 770 0~+70 -65~+150 Unit V mA mA mW °C °C CYStek Product Specification Spec. No. : C502M3 Issued Date : 2003.04.02 Revised Date : 2005.04.20 Page No. : 2/5 CYStech Electronics Corp. Functional Block Diagram & Symbol Functional Block Diagram : Symbol : Cathode Cathode Reference + - Reference VREF Anode Anode Test Circuits IN II VZ IREF II IN R1 IZ VREF Fig1. Test Circuit for VZ=VREF VZ IN VZ IREF IZ R2 VREF Fig 2. Test Circuit for VZ>VREF Note : VZ=VREF(1+R1/R2)+IREFxR1 Fig3. Test Circuit for Off-State Current Electrical Characteristics ( Ta=25°C unless otherwise specified ) Characteristics Symbol Test Conditions Reference Input Voltage TL431A VREF VKA=VREF, IK=10mA TL431B TL431C V =V , I =10mA Deviation of Reference Input Voltage VREF(dev) KA REF K Over-Temperature Tmin≤Ta≤Tmax IK=10mA, Ratio of Change in Reference Input ∆VREF / ∆VKA=10V-VREF Voltage to the Change in Cathode ∆VKA IK=10mA, Voltage ∆KKA=36V-10V IK=10mA, R1=10kΩ, Reference Input Current IREF R2=∞ Deviation of Reference Input Current I =10mA, R1=10kΩ, IREF(dev) K Over Full Temperature Range R2=∞, Ta=Full Range Minimum Cathode Current for IK(min) VKA=VREF Regulation Off-State Cathode Current IK(off) VKA=36V, VREF=0 VKA=VREF, f≤1.0KHz Dynamic impedance ZKA IK=1 to 100mA TL431M3 Min Typ Max Unit 2.445 2.495 2.545 2.470 2.495 2.520 V 2.480 2.495 2.510 - 4 17 mV - -1.4 -2.7 mV - -1.0 -2.0 V - 2 4 µA - 0.4 1.2 µA - 0.4 1.0 mA - 0.1 1.0 µA - 0.2 0.5 Ω CYStek Product Specification Spec. No. : C502M3 Issued Date : 2003.04.02 Revised Date : 2005.04.20 Page No. : 3/5 CYStech Electronics Corp. Characteristic Curves CATHODE CURRENT vs CATHODE VOLTAGE CATHODE CURRENT vs CATHODE VOLTAGE 800 IK - COTHODE CURRENT (uA) IK - COTHODE CURRENT (mA) 150 125 100 75 50 25 0 -25 -50 -75 700 600 500 400 300 200 100 0 -100 -200 -100 -1.5 -1 -0.5 0 0.5 1 1.5 2 -1 2.5 -0.5 VAK - CATHODE VOLTAGE (V) REFERENCE INPUT VOLTAGE vs AMBIENT TEMPERATURE Vref - REFERENCE INPUT CURRENT (nA) Vref - REFERENCE INPUT VOLTAGE (mV) 1 1.5 2 2.5 3 350 2.462 2.46 2.458 2.456 2.454 2.452 300 250 200 150 100 50 0 2.45 0 25 50 75 100 0 125 25 50 75 100 125 AMBIENT TEMPERATURE(℃ ) AMBIENT TEMPERATURE(℃ ) CATHODE VOLTAGE vs REFERENCE INPUT VOLTAGE DYNAMIC IMPEDANCE vs FREQUENCE 0 100 Z KA - DYNAMIC IMPEDANCE (Ω) Δ Vref - REFERENCE INPUT VOLTAGE (mV) 0.5 REFERENCE INPUT CURRENT vs AMBIENT TEMPERATURE 2.464 -5 -10 -15 -20 -25 -30 0 5 10 15 20 25 30 35 VKA - CATHODE VOLTAGE (V) TL431M3 0 VAK - CATHODE VOLTAGE (V) 40 10 1 0.1 1 10 100 1000 f - FREQUENCE (KHz) CYStek Product Specification CYStech Electronics Corp. Spec. No. : C502M3 Issued Date : 2003.04.02 Revised Date : 2005.04.20 Page No. : 4/5 OPEN-LOOP VOLTAGE GAIN (dB) OPEN-LOOP VOLTAGE GAIN vs FREQUENCY 40 30 20 10 0 1 10 100 1000 F - FREQUENCY (KHz) TL431M3 CYStek Product Specification Spec. No. : C502M3 Issued Date : 2003.04.02 Revised Date : 2005.04.20 Page No. : 5/5 CYStech Electronics Corp. SOT-89 Dimension Marking: A 2 1 3 H C 431 431 D B E Style: Pin 1. Reference 2. Anode 3. Cathode I F 3-Lead SOT-89 Plastic Surface Mounted Package CYStek Package Code: M3 G *: Typical Inches Min. Max. 0.1732 0.1811 0.1594 0.1673 0.0591 0.0663 0.0945 0.1024 0.01417 0.0201 DIM A B C D E Millimeters Min. Max. 4.40 4.60 4.05 4.25 1.50 1.70 2.40 2.60 0.36 0.51 DIM F G H I Inches Min. Max. 0.0583 0.0598 0.1165 0.1197 0.0551 0.0630 0.0138 0.0161 Millimeters Min. Max. 1.48 1.527 2.96 3.04 1.40 1.60 0.35 0.41 Notes: 1.Controlling dimension: millimeters. 2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.If there is any question with packing specification or packing method, please contact your local CYStek sales office. Material: • Lead: 42 Alloy ; solder plating • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 Important Notice: • All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek. • CYStek reserves the right to make changes to its products without notice. • CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems. • CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. TL431M3 CYStek Product Specification