A Product Line of Diodes Incorporated TLV431 1.24V COST EFFECTIVE SHUNT REGULATOR Description Pin Assignments The TLV431 is a three terminal adjustable shunt regulator offering TLV431_H6 (SC70-6 [SOT363]) excellent temperature stability and output current handling capability CATHODE 1 6 ANODE up to 20mA. The output voltage may be set to any chosen voltage between 1.24 and 18 volts by selection of two external divider N/C‡ 2 5 NC‡ resistors. The TLV431 can be used as a replacement for zener diodes in many REF 3 4 NC applications requiring an improvement in zener performance. (Top View) The TLV431 is available in 3 grades with initial tolerances of 1%, 0.5%, and 0.2% for the A, B and T grades respectively. TLV431_F (SOT23) REF 1 Features • Low Voltage Operation VREF = 1.24V 3 ANODE • Temperature range -40 to +125°C • Reference Voltage Tolerance at +25°C CATHODE 2  0.2% TLV431T  0.5% TLV431B (Top View)  1% TLV431A • Typical temperature drift TLV431_E5 (SOT25)  4 mV (0°C to +70°C)  6 mV (-40°C to +85°C) N/C 1 5 ANODE  11mV (-40°C to +125°C) • 80µA Minimum cathode current N/C‡ 2 • 0.25Ω Typical Output Impedance • Adjustable Output Voltage VREF to 18V CATHODE 3 4 REF • Lead-Free Finish; RoHS Compliant (Notes 1 & 2) • Halogen and Antimony Free. “Green” Device (Note 3) (Top View) • Qualified to AEC-Q100 ‡ Pin should be left floating or connect to anode Typical Application Circuit Secondary side 3.3 V regulated supply Optocoupler IF Primary side controller R3 R1 TLV431 R2 GND Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied. 2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. TLV431 1 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) Symbol Parameter Rating Unit VKA Cathode Voltage 20 V IKA Continuous Cathode Current -20 to +20 mA IREF Reference Input Current Range -0.05 to +3 mA VIN Input Supply Voltage (Relative to Ground) -0.03 to +18 V ESD Susceptibility HBM Human Body Model 4 kV MM Machine Model 400 V CDM Charged Device Model 1 kV (Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices.) Parameter Rating Unit Operating Junction Temperature -40 to +150 °C Storage Temperature -65 to +150 °C Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability. Unless otherwise stated voltages specified are relative to the ANODE pin. These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure. Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Symbol Parameter Min Max Units VKA Cathode Voltage VREF 18 V IKA Cathode Current 0.1 15 mA TA Operating Ambient Temperature Range -40 +125 °C Package Thermal Data Package θJA TA = +25°CP, D TISJ = +150°C SOT23 380°C/W 330mW SOT25 250°C/W 500mW SC70-6 380°C/W 330mW (SOT363) TLV431 2 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Electrical Characteristics (@TA = +25°C, unless otherwise specified.) Symbol Parameter Conditions Min Typ Max Units TLV431A 1.228 1.24 1.252 VKA = VREF, TLV431B 1.234 1.24 1.246 TA = +25°C TLV431T 1.2375 1.24 1.2425 TLV431A 1.221 1.259 VKA = VREF, TLV431B 1.227 1.253 TA = 0 to +70°C TLV431T 1.230 1.250 V VREF Reference Voltage TLV431A 1.215 1.265 VKA = VREF, TLV431B 1.224 1.259 TA = -40 to +85°C TLV431T 1.228 1.252 TLV431A 1.209 1.271 VKA = VREF, TLV431B 1.221 1.265 TA = -40 to +125°C TLV431T 1.224 1.255 Deviation of reference TA = 0 to +70°C 4 12 VREF(dev) voltage over full VKA = VREF TA = -40 to +85°C 6 20 mV temperature range TA = -40 to +125°C 11 31 Ratio of change in 6V -1.5 -2.7 ΔΔVVRKEAF rcehfaenregnec ien vcoaltthaogdee t o the VKA for VREF to 18V -1.5 -2.7 mV/V voltage IREF Reference Input Current R1 = 10kΩ, R2 = OC 0.15 0.5 µA TA = 0 to +70°C 0.05 0.3 IREF(dev) tIReEmFp deeravitautrieo nra onvgeer full RR12 == 1O0Ck Ω, TA = -40 to +85°C 0.1 0.4 µA TA = -40 to +125°C 0.15 0.5 TA = 0 to +70°C 55 80 Minimum cathode IKMIN current for regulation VKA = VREF TA = -40 to +85°C 55 80 µA TA = -40 to +125°C 55 100 IK(OFF) Off state current VKA = 18V, VREF = 0V 0.001 0.1 µA ZKA Dimypneadmaincc oeu tput IVKK =A 0=. 1V RtoE F1, 5f m= A< 1kHz 0.25 0.4 Ω TLV431 3 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Typical Characteristics 56kΩ 75kΩ I O/P K S1 100nF 10mA 10kΩ Test Circuit for VREF Measurement TLV431 4 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Typical Characteristics (cont.) TLV431 5 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Typical Characteristics (cont.) 3V 1kΩ 470µF 750Ω O/P Test Circuit for Input Noise Voltage O/P 6.8kΩ I K 180Ω 10µF 5V ~ 4.3kΩ Test Circuit for Phase Shift and Gain 100Ω 100µF O/P 100Ω ~ 50Ω Test Circuit for Reference Impedance TLV431 6 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Typical Characteristics (cont.) O/P Pulse Generator Test Circuit for Pulse Response TLV431 7 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Application Notes In a conventional shunt regulator application (Figure 1), an external series resistor (R3) is connected between the supply voltage, VIN, and the TLV431. R3 determines the current that flows through the load (IL) and the TLV431 (IK). The TLV431 will adjust how much current it sinks or “shunts” to maintain a voltage equal to VREF across its feedback pin. Since load current and supply voltage may vary, R3 should be small enough to supply at least the minimum acceptable IKMIN to the TLV431 even when the supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum and IL is at its minimum, R3 should be large enough so that the current flowing through the TLV431 is less than 15mA. R3 is determined by the supply voltage, (VIN), the load and operating current, (IL and IK), and the TLV431’s reverse breakdown voltage, VKA. R3 IL Vin Vout V −V IK R1 R3 = IIN +IKA L K V REF where TLV431  R  VKA =VREF×1+ 1 C1  R2 0.1µF R2 and VKA = VOUT GND Figure 1 The values of R1 and R2 should be large enough so that the current flowing through them is much smaller than the current through R3 yet not too large that the voltage drop across them caused IREF affects the reference accuracy. The most frequent application of the TLV431 is in isolated low output voltage power supplies where the regulated output is galvanically isolated from the controller. As shown in Figure 2 the TLV431 drives current, IF, through the opto-coupler’s LED which in turn drives the isolated transistor which is connected to the controller on the primary side of the power supply. This completes the feedback path through the isolation barrier and ensures that a stable isolated supply is maintained. Assuming a forward drop of 1.4V across the opto-coupler diode allows output voltages as low as 2.7V to be regulated. Regulated Supply Regulated Supply Optocoupler IF To controller To controller  R1 VOUT =VREF1+   R2 R3 R1 TLV431 VOIUT −2.7 >R3≥ VOUT1(5mmaxA)−2.7 F(min) R2 GND Figure 2. Using the TLV431 as the Regulating Element in an Isolated PSU TLV431 8 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Application Notes (cont.) Printed Circuit Board Layout Considerations The TLV431 in the SOT25 package has the die attached to pin 2, which results in an electrical contact between pin 2 and pin 5. Therefore, pin 2 of the SOT25 package must be left floating or connected to pin 5. TLV431 in the SC70-6 (SOT363) package has the die attached to pin 2 and 5, which results in an electrical contact between pins 2, 5 and pin 6. Therefore, pins 2 and 5 must be left floating or connected to pin 6. Other Applications of the TLV431 R3 Vin Vout  R1 V =V 1+  R4 R1 OUT REF R2 ZXTP2039F IB Q1 R3= VIINSH−+VOIBUT V REF TLV431 R4= VBE I B C1 0.1µF  ISH <I ≤15mA R2 hFE(min) B ISH GND Figure 3. High Current Shunt Regulator It may at times be required to shunt-regulate more current than the 15mA that the TLV431 is capable of. Figure 3 shows how this can be done using transistor Q1 to amplify the TLV431’s current. Care needs to be taken that the power dissipation and/or SOA requirements of the transistor is not exceeded. ZXTN25020CFH IOUT Vin Vout Q1 R3 R1  R1 V =V 1+  OUT REF IB  R2 VREF R3= VIN−(VOUT+VBE) TLV431 IB I  C1  OhFUET((mmianx))<IB ≤15mA 0.1µF R2 GND Figure 4. Basic Series Regulator A very effective and simple series regulator can be implemented as shown in Figure 4 above. This may be preferable if the load requires more current than can be provided by the TLV431 alone and there is a need to conserve power when the load is not being powered. This circuit also uses one component less than the shunt circuit shown in Figure 3 above. TLV431 9 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Application Notes (cont.) Printed Circuit Board Layout Considerations (cont.) ZXTN25020CFH RS IOUT Vin Vout Q1 VREF  R1 R3 TLV431 VOUT =VREF1+R2 IB R1 R3= VIN−(VOUT+VBE) I B I  VREF  OUT(max)<I ≤18mA TLV431  hFE(min)  B C1 R = VREF 0.1µF R2 S IOUT(max) GND Figure 5. Series Regulator with Current Limit Figure 5 adds current limit to the series regulator in Figure 4 using a second TLV431. For currents below the limit, the circuit works normally supplying the required load current at the design voltage. However should attempts be made to exceed the design current set by the second TLV431, the device begins to shunt current away from the base of Q1. This begins to reduce the output voltage and thus ensuring that the output current is clamped at the design value. Subject only to Q1’s ability to withstand the resulting power dissipation, the circuit can withstand either a brief or indefinite short circuit. AP1084 Vin Vin VR1Vout Vout GND  R1 V =V 1+  OUT REF V R1  R2 REG V ≥(V +V ) OUT REG REF TLV431 VREF (All features of the regulator such as short circuit protection, C1 thermal shutdown, etc, are R2 0.1µF maintained.) GND Figure 6. Increasing Output Voltage of a Fixed Linear Regulator One of the useful applications of the TLV431 is in using it to improve the accuracy and/or extend the range and flexibility of fixed voltage regulators. In the circuit in Figure 6 above both the output voltage and its accuracy are entirely determined by the TLV431, R1 and R2. However the rest of the features of the regulator (up to 5A output current, output current limiting and thermal shutdown) are all still available. TLV431 10 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Application Notes (cont.) Printed Circuit Board Layout Considerations (cont.) AP1117 or AP1084  R1 V =V 1+  OUT REF Vin Vin VR1Vout Vout  R2 IB R3 GND VOUT ≥(VREG +VREF) 1.2 V R1 V −(V −V ) R3= IN OUT REG I B TLV431 VREF 0.1mA≤IB ≤18mA (All features of the regulator C1 0.1µF R2 such as short circuit protection, thermal shutdown, GND etc, are maintained.) Figure 7. Adjustable Linear Voltage Regulator Figure 7 is similar to Figure 6 with adjustability added. Note the addition of R3. This is only required for the AP1117 due to the fact that its ground or adjustment pin can only supply a few micro-amps of current at best. R3 is therefore needed to provide sufficient bias current for the TLV431. Ordering Information Quanity per Tol. Part Number Package Part Mark Status Reel Size Tape Width Reel TLV431AE5TA SOT25 V1A Active 7”, 180mm 8mm 3000 TLV431AFTA SOT23 V1A Active 7”, 180mm 8mm 3000 1% SC70-6 TLV431AH6TA V1A Active 7”, 180mm 12mm 1000 (SOT363) TLV431BE5TA SOT25 V1B Active 7”, 180mm 8mm 3000 TLV431BFTA SOT23 V1B Active 7”, 180mm 8mm 3000 0.5% SC70-6 TLV431BH6TA V1B Active 7”, 180mm 12mm 1000 (SOT363) 0.2% TLV431TFTA SOT23 V1T Active 7”, 180mm 8mm 3000 TLV431 11 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version. SOT23 A SOT23 Dim Min Max Typ A 0.37 0.51 0.40 B 1.20 1.40 1.30 B C C 2.30 2.50 2.40 D 0.89 1.03 0.915 F 0.45 0.60 0.535 G 1.78 2.05 1.83 H 2.80 3.00 2.90 H J 0.013 0.10 0.05 K 0.903 1.10 1.00 K M K1 K1 — — 0.400 D L 0.45 0.61 0.55 J F G L M 0.085 0.18 0.11 α 0° 8° — All Dimensions in mm SOT25 A SOT25 Dim Min Max Typ A 0.35 0.50 0.38 B C B 1.50 1.70 1.60 C 2.70 3.00 2.80 D   0.95 H 2.90 3.10 3.00 J 0.013 0.10 0.05 H K 1.00 1.30 1.10 L 0.35 0.55 0.40 K N M M 0.10 0.20 0.15 N 0.70 0.80 0.75 J α 0° 8°  D L All Dimensions in mm SC70-6 (SOT363) A SC70-6 (SOT363) Dim Min Max Typ A 0.10 0.30 0.25 B C B 1.15 1.35 1.30 C 2.00 2.20 2.10 D 0.65 Typ F 0.40 0.45 0.425 H H 1.80 2.20 2.15 J 0 0.10 0.05 K M K 0.90 1.00 1.00 L 0.25 0.40 0.30 J M 0.10 0.22 0.11 D F L α 0° 8° - All Dimensions in mm TLV431 12 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. SOT23 Y Dimensions Value (in mm) Z 2.9 X 0.8 Z C Y 0.9 C 2.0 E 1.35 X E SOT25 C2 C2 Dimensions Value (in mm) Z 3.20 G 1.60 X 0.55 Y 0.80 Z G C1 C1 2.40 C2 0.95 Y X SC70-6 (SOT363) C2 C2 Dimensions Value (in mm) Z 2.5 G 1.3 X 0.42 Z G C1 Y 0.6 C1 1.9 C2 0.65 Y X TLV431 13 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

A Product Line of Diodes Incorporated TLV431 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2012, Diodes Incorporated www.diodes.com TLV431 14 of 14 October 2012 Document number: DS32088 Rev. 6 - 2 www.diodes.com © Diodes Incorporated

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: D iodes Incorporated: TLV431AE5TA TLV431AFTA TLV431AH6TA TLV431BE5TA TLV431BH6TA TLV431BFTA TLV431TFTA