A Product Line of Diodes Incorporated ZTL431/ZTL432 COST EFFECTIVE ADJUSTABLE PRECISION SHUNT REGULATOR Description Pin Assignments The ZTL431 and ZTL432 are three terminal adjustable shunt regulators offering excellent temperature stability and output current handling capability up to 100mA. The output voltage may be set to any chosen voltage between 2.5 and 20 volts by selection of two external divider resistors. The devices can be used as a replacement for zener diodes in many applications requiring an improvement in zener performance. The ZTL432 has the same electrical specifications as the ZTL431 but has a different pin out in SOT23 (F-suffix) and SOT23F (FF-suffix). ZTL431_F SOT23, ZTL431_FF SOT23F (Top View) Cathode 3 1 Anode Ref 2 ZTL432_F SOT23, ZTL432_FF SOT23F (Top View) Ref 3 1 Anode Both variants are available in 2 grades with initial tolerances of 1% and 0.5% for the A and B grades respectively. These are functionally equivalent to the TL431/ TL432 except for maximum operation voltage, and have an ambient temperature range of -40 to 125°C as standard. Cathode 2 ZTL431_H6, SC70-6 (Top View) Cathode 1 † N/C • • Ref 3 • • • † 2 Features Temperature range ................ -40 to 125°C Reference voltage tolerance at 25°C o 0.5%.......................................B grade o 1% .........................................A grade 0.2Ω typical output impedance Sink current capability…….. 1mA to 100mA Adjustable output voltage……VREF to 20V 6 Anode 5 N/C 4 NC †Connected internally to substrate; should be left floating or connected to Anode ZTL431ASE5 SOT235 (Top View) Cathode 1 5 N/C Anode 2 Applications • • • • Ref 3 Opto-coupler linearization Linear regulators Improved zener Variable reference 4 N/C ZTL431_E5 SOT235 (Top View) N/C 1 5 Anode N/C* 2 Cathode 3 4 Ref *must be left floating or connected to pin 5 ZTL431/ZTL432 Document number: DS33263 Rev. 15 - 2 1 of 9 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZTL431/ZTL432 Absolute Maximum Ratings (Voltages specified are relative to the ANODE pin unless otherwise stated) Parameter Cathode Voltage (VKA) Continuous Cathode Current (IKA) Reference Input Current Range (IREF) Operating Junction Temperature Storage Temperature Rating 20 150 -50µA to 10mA -40 to 150 -55 to 150 Unit V mA °C °C Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability. Package Thermal Data Package θJA SOT23 SOT23F SOT23-5 SOT70-6 380°C/W 138°C/W 250°C/W 380°C/W PDIS TA = 25°C, TJ = 150°C 330 mW 900 mW 500 mW 330mW Recommended Operating Conditions VKA Cathode Voltage IKA Cathode Current TA Operating Ambient Temperature Range Electrical Characteristics Symbol Min VREF 1 -40 Max 20 100 125 Units V mA °C (Test conditions unless otherwise specified: TA = 25°C) Parameter Conditions VREF Reference voltage VKA = VREF IKA = 10mA VDEV Deviation of reference voltage over full temperature range VKA = VREF IKA = 10 mA ΔVREF ΔVKA Ratio of change in reference voltage to the change in cathode voltage IKA = 10mA IREF Reference input current IKA = 10mA, R1 = 10kΩ R2 = OC ΔIREF IREF deviation over full temperature range IKA = 10mA R1 = 10kΩ R2 = OC Min. Typ. Max. ZTL43_A 2.475 2.5 2.525 ZTL43_B 2.487 2.5 2.513 TA = 0 to 70° 6 16 TA = -40 to 85°C 14 34 TA = -40 to 125°C 14 34 VKA = VREF to 10 -1.4 -2.7 VKA = 10V to 20V -1.0 -2.0 2 4 TA = 0 to 70°C 0.8 1.2 TA = -40 to 85°C 0.8 2.5 TA = -40 to 125°C 0.8 2.5 Units V mV mV/V µA µA IKA(MIN) Minimum cathode current for regulation VKA = VREF 0.4 0.6 mA IKA(OFF) Off state current VKA = 20V, VREF = 0V 0.1 0.5 µA RZ Dynamic output impedance VKA = VREF, f = 0Hz 0.2 0.5 Ω ZTL431/ZTL432 Document number: DS33263 Rev. 15 - 2 2 of 9 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZTL431/ZTL432 Typical Characteristics IKA = 10mA Reference Voltage vs. Temperature VREF = VKA Dynamic Impedance vs. Frequency Power Dissipation (mW) 1000 SOT23F 900 800 700 600 SOT23-5 500 400 300 SOT23 SC70-6 200 100 0 0 25 50 75 100 125 Ambient Temperature (°C) Power Dissipation Derating ZTL431/ZTL432 Document number: DS33263 Rev. 15 - 2 3 of 9 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZTL431/ZTL432 Typical Characteristics (Cont.) VKA IKA 60 Gain (dB) 50 40 30 20 10 0 100 1000 10000 100000 1000000 Frequency (Hz) IKA Test Circuit for Open Loop Voltage Gain Gain vs. Frequency VKA VKA Pulse Response Test Circuit for Pulse Response VKA 100 Cathode Current (mA) 90 IKA 80 70 60 50 Stable Stable ab e 40 30 20 10 0 10.0E-12 100.0E-12 1.0E-9 10.0E-9 100.0E-9 1.0E-6 Load Capacitance (F) Stability Boundary Condition ZTL431/ZTL432 Document number: DS33263 Rev. 15 - 2 VREF < VKA < 20, IKA = 10mA, TA = 25°C Test Circuit for Stabilty Boundary Conditions 4 of 9 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZTL431/ZTL432 Application Circuits V+ V+ VOUT VOUT R1 R1 VREF VREF R2 R2 VREF VOUT VREF VOUT Higher current shunt regulator Shunt regulator V+ ZSR*** V+ In VOUT Out 30Ω Common R1 0.01µF VREF R1 VOUT R2 VREF R2 VOUT(MIN) = VREF + VREG VOUT VREF VOUT Output control of a three terminal fixed regulator VREF Series regulator V+ R1 V+ R1 Output VREF VON~ 2V VOFF = V+ R2a VREF Output Input VTH = 2.5V R2b VREF VREF Single supply comparator with temperature compensated threshold ZTL431/ZTL432 Document number: DS33263 Rev. 15 - 2 Over voltage / under voltage protection circuit 5 of 9 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZTL431/ZTL432 DC Test Circuits Notes 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, Vref is defined as: VREF(ppm/°C) = VDEV × 1,000,000 VREF(T1-T2) The dynamic output impedance, Rz, is defined as: RZ = ΔVZ ΔIZ When the device is programmed with two external resistors, R1 and R2, (fig 2), the dynamic output impedance of the overall circuit, R'z, is defined as: R'Z = RZ (1 + R1 ) R2 Stability Boundary The ZTL431 and ZTL432 are stable with a range of capacitive loads. A zone of instability exists as demonstrated in the typical characteristic graph on page 4. The graph shows typical conditions. To ensure reliable stability a capacitor of 4.7nF or greater is recommended between anode and cathode. ZTL431/ZTL432 Document number: DS33263 Rev. 15 - 2 6 of 9 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZTL431/ZTL432 Ordering Information Tol. 1% 0.5% Ordering Code ZTL431AE5TA ZTL431AFFTA ZTL431AFTA ZTL431AH6TA ZTL431ASE5TA ZTL432AFFTA ZTL432AFTA ZTL431BE5TA ZTL431BFFTA ZTL431BFTA ZTL431BH6TA ZTL432BFFTA ZTL432BFTA Pack Part Mark Status* Reel Size 31A 31A 31A 31A S2A 32A 32A 31B 31B 31B 31B 32B 32B Active Active Active Active Active Active Active Active Active Active Active Active Active 7”, 180mm 7”, 180mm 7”, 180mm 7”, 180mm 7”, 180mm 7”, 180mm 7”, 180mm 7”, 180mm 7”, 180mm 7”, 180mm 7”, 180mm 7”, 180mm 7”, 180mm SOT23-5 SOT23F SOT23 SC70-6 SOT23-5 SOT23F SOT23 SOT23-5 SOT23F SOT23 SC70-6 SOT23F SOT23 Tape Width (mm) 8 8 8 8 8 8 8 8 8 8 8 8 8 Quantity per Reel 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 3000 Package Outline Dimensions SOT23 E Dim. e Millimeters Min. Max. Inches Min. - Dim. Max. 0.044 e1 Millimeters Inches Min. Max. Max. Max. A - 1.12 1.90 NOM 0.075 NOM A1 0.01 0.10 0.0004 0.004 E 2.10 2.64 0.083 0.104 b 0.30 0.50 0.012 0.020 E1 1.20 1.40 0.047 0.055 C 0.085 0.120 0.003 0.008 0.25 0.62 0.018 0.024 D 2.80 0.110 0.120 L1 e 0.95 NOM 0.0375 NOM e1 b 3 leads L1 D E1 A A1 L 3.04 L 0.45 - 0.62 0.018 0.024 - - - - Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches c SC70-6 Dim. Millimeters A a Inches Min. Max. Min. 0.80 Max. 1.10 0.0315 0.0433 0.10 - Dim. E 0.0039 E1 Millimeters Inches Min. Max. Max. Max. 2.10 BSC 0.0826 BSC A1 - A2 0.80 1.00 0.0315 0.0394 e 0.65 BSC 0.0255 BSC b 0.15 0.30 0.006 0.0118 e1 1.30 BSC 0.0511 BSC C 0.08 0.25 0.0031 0.0098 0.26 0.46 0.0102 0.0181 D 2.00 BSC 0.0787 BSC L a 1.25 1.35 0.0492 0.0531 0° 8° 0° 8° Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches ZTL431/ZTL432 Document number: DS33263 Rev. 15 - 2 7 of 9 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZTL431/ZTL432 Package Outline Dimensions (continued) SOT23F c D b Dim. e1 b e L1 L A A1 E E1 R b A1 A A2 Millimeters Inches Min. Max. Min. Dim. Max. 0.80 1.00 0.031 0.0394 Millimeters Min. Max. Inches Max. Max. E 2.30 2.50 0.0906 0.0984 0.00 0.0043 E1 1.50 1.70 0.0590 0.0669 0.06 0.16 0.0024 0.0006 E2 1.10 1.26 0.0433 0.0496 - 0.10 b 0.39 0.41 0.0153 0.0161 L 0.48 0.68 0.0189 0.0268 c 0.11 0.20 0.0043 0.0079 L1 0.39 0.41 0.0153 0.0161 D 2.80 3.00 0.1102 0.1181 R 0.05 0.15 0.0019 0.0059 e 0.95 ref 0.0374 ref O 0° 12° 0° 12° e1 1.90 ref 0.7480 ref - - - - - Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches TO92 Dim. Millimeters Inches Min. Max. Min. Max. A 4.32 4.95 0.170 0.195 b 0.36 0.51 0.014 0.020 C 2.50 3.50 0.099 0.138 E 3.30 3.94 0.130 0.155 e 4.88 5.88 0.192 0.232 0.116 e1 2.44 2.94 0.096 L 12.70 15.49 0.500 0.610 R 2.16 2.41 0.085 0.095 S1 1.14 1.52 0.045 0.060 W 0.41 0.56 0.016 0.022 D 4.45 4.95 0.175 0.195 *° 4° 6° 4° 6° Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches SOT23-5 Dim. Millimeters Inches Min. Max. Min. Max. A 0.90 1.45 0.0354 0.0570 A1 0.00 0.15 0.00 0.0059 A2 0.90 1.30 0.0354 0.0511 b 0.20 0.50 0.0078 0.0196 C 0.09 0.26 0.0035 0.0102 D 2.70 3.10 0.1062 0.1220 E 2.20 3.20 0.0866 0.1181 E1 1.30 1.80 0.0511 0.0708 e 0.95 REF e1 L a° 1.90 REF 0.0374 REF 0.0748 REF 0.10 0.60 0.0039 0.0236 0° 30° 0° 30° Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches ZTL431/ZTL432 Document number: DS33263 Rev. 15 - 2 8 of 9 www.diodes.com November 2010 © Diodes Incorporated A Product Line of Diodes Incorporated ZTL431/ZTL432 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. 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