ZR431L ADJUSTABLE PRECISION SHUNT REGULATOR Description Pin Assignments The ZR431L is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 25mA. The output voltage may be set to any chosen voltage between 1.24 and 10 volts by selection of two external divider resistors. (Top View) VREF 1 The devices can be used as a replacement for zener diodes in many applications requiring an improvement in zener performance. 3 GND VZ The ZR431L is particularly used in the feedback control loop of switch mode power supplies. In this application the device 1.24 volt reference enables the generation of low voltage supplies, typically 3.3 volts or 3 volts. 2 SOT23 Features 2.5% and 1% Tolerance Max. Temperature Coefficient 50ppm/°C Applications Temperature Compensated for Operation over The Full Temperature Range Shunt Regulator Series Regulator Voltage Monitor Over Voltage/ Under Voltage Protection Switch Mode Power Supplies Programmable Output Voltage 100μA to 100mA Current Sink Capability Surface Mount SOT23 Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html 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. Typical Applications Circuit V+ V+ VOUT VOUT R1 R1 VREF VREF R2 R2 R1 V V OUT 1 R2 REF R1 V V OUT 1 R2 REF SHUNT REGULATOR HIGHER CURRENT SHUNT REGULATOR ZR431L Document number: DS33256 Rev. 4 - 2 1 of 9 www.diodes.com April 2015 © Diodes Incorporated ZR431L Typical Applications Circuit (cont.) V+ ZSR*** V+ IN VOUT OUT 30 Common R1 0.01µF VREF R1 R2 V OUT V REF R2 VOUT(MIN) = VREF + VREG R1 V V OUT 1 R2 REF R1 V V OUT 1 R2 REF OUTPUT CONTROL OF A THREE TERMINAL FIXED REGULATOR SERIES REGULATOR V+ V+ R1A R1B VREF OUTPUT OUTPUT VREF INPUT VON 2V R2A VOFF = V+ R2B VTH = 2.5V R1B Low lim it 1 V REF R2B SINGLE SUPPLY COMPARATOR WITH TEMPERATURE COMPENSATED THRESHOLD R1A Highlim it 1 V REF R2A OVER VOLTAGE/UNDER VOLTAGE PROTECTION CIRCUIT Functional Block Diagram VZ GND ZR431L Document number: DS33256 Rev. 4 - 2 2 of 9 www.diodes.com April 2015 © Diodes Incorporated ZR431L Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 4) Symbol Parameter Rating Unit VZ Cathode Voltage 10 V IZ Cathode Current 50 mA TJ Junction Temperature -40 to +125 ° TSTG Storage Temperature -55 to +105 ° θJA Thermal Resistance SOT23 C C ° 380 C/W Note 4: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Symbol Parameter Min Max Unit VZ Cathode Voltage VREF 10 V IZ Cathode Current 0.1 25 mA TA Operating Temperature -40 +85 ° C Electrical Characteristics (@TA = +25°C, unless otherwise specified.) Symbol Parameter Test Conditions Min Typ. Max 1.209 1.24 1.271 1% 1.228 1.24 1.252 Deviation of Reference Input Voltage Over IL = 10mA, VZ = VREF Temperature TA = Full range (Figure 1) – 4 8 mV ΔVZ Ratio of The Change in Reference Voltage VZ from VREF to 10V to The Change in Cathode Voltage IZ = 10mA (Figure 2) – 0.5 2 mV/V IREF Reference Input Current 0.02 0.11 0.4 µA 2.5% VREF VDEV ΔVREF Reference Voltage IL = 10mA (Figure 1), VZ = VREF R1 = 10k, R2 = O/C, IL = 10mA (Figure 2) Unit V ΔIREF Deviation of Reference Input Current over R1 = 10k, R2 = O/C, IL = 10mA Temperature TA = Full range (Figure 2) – 0.02 0.2 µA IZ(MIN) Minimum Cathode Current for Regulation VZ = VREF (Figure 1) – 30 100 µA IZ(OFF) Off-state Current VZ = 10V, VREF = 0V (Figure 3) – 10 30 µA Dynamic Output Impedance VZ = VREF (Figure 1), f = 0Hz – 0.25 2 Ω RZ For definitions of reference voltage temperature coefficient and dynamic output impedance see NOTES following DC TEST CIRCUITS. ZR431L Document number: DS33256 Rev. 4 - 2 3 of 9 www.diodes.com April 2015 © Diodes Incorporated ZR431L DC Test Circuits Figure 1. Test Circuit for VZ = VREF Figure 2. Test Circuit for VZ > VREF Figure 3. Test Circuit for Off State Current Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference input voltage over the full temperature range. The average temperature coefficient of the reference input voltage, V REF is defined as: VMAX Vref (ppm / o C) Vdev 1000000 Vref (T1 T2) The dynamic output impedance, RZ is defined as: VDEV = VMAX - VMIN VMIN Rz Vz I z When the device is programmed with two external resistors, R1 and R2 (Figure 2), the dynamic output impedance of the overall circuit, R’, is defined as: T1 Temperature ZR431L Document number: DS33256 Rev. 4 - 2 T2 4 of 9 www.diodes.com R R z (1 R1 ) R2 April 2015 © Diodes Incorporated ZR431L Performance Characteristics VREF=VKA IK=1mA IK=10mA ZR431L Document number: DS33256 Rev. 4 - 2 5 of 9 www.diodes.com April 2015 © Diodes Incorporated ZR431L Performance Characteristics (cont.) ZR431L Document number: DS33256 Rev. 4 - 2 6 of 9 www.diodes.com April 2015 © Diodes Incorporated ZR431L Ordering Information ZR431L X XX XX Package Tolerance Packing F : SOT23 01 : 1% 02 : 2.5% TA : Tape & Reel 7” Tape and Reel Part Number Quantity Suffix Part Number Tolerance Package Code Part Mark Packaging ZR431LF01TA 1% F 43M SOT23 3000/Tape & Reel TA ZR431LF02TA 2.5% F 43L SOT23 3000/Tape & Reel TA Marking Information ( Top View ) 3 43: Identification Code X: Voltage Tolerance M : 1% L : 2.5% 43X 1 ZR431L Document number: DS33256 Rev. 4 - 2 2 7 of 9 www.diodes.com April 2015 © Diodes Incorporated ZR431L Package Outline Dimensions Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version. (1) Package Type: SOT23 All 7° H K1 GAUGE PLANE 0.25 J K a M A L C L1 B D SOT23 Dim Min Max Typ A 0.37 0.51 0.40 B 1.20 1.40 1.30 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 J 0.013 0.10 0.05 K 0.890 1.00 0.975 K1 0.903 1.10 1.025 L 0.45 0.61 0.55 L1 0.25 0.55 0.40 M 0.085 0.150 0.110 a 8° All Dimensions in mm G F . Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. (1) Package Type: SOT23 Y Z C X ZR431L Document number: DS33256 Rev. 4 - 2 Dimensions Z X Y C E Value (in mm) 2.9 0.8 0.9 2.0 1.35 E 8 of 9 www.diodes.com April 2015 © Diodes Incorporated ZR431L 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). 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