ZR431L ADJUSTABLE PRECISION SHUNT REGULATOR SUMMARY DESCRIPTION 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. The devices can be used as a replacement for zener diodes in many applications requiring an improvement in zener performance. 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. SOT23 FEATURES • 2.5% and 1% tolerance • Max. temperature coefficient 50 ppm/°C • Temperature compensated for operation over the full temperature range • 100A to 25mA current sink capability • Surface mount SOT23 package • TO92 package TO92 APPLICATIONS • • • • • Switch mode power supplies Shunt regulator Series regulator Voltage monitor Over voltage / under voltage protection SOT23 ORDERING INFORMATION Top View DEVICE PACK TOL % REEL SIZE QUANTITY PER REEL PART MARK ZR431LF01TA SOT23 1 7” 3000 43M ZR431LF02TA SOT23 2.5 7” 3000 43L ZR431LC01STOB TO92 1 1500 ZR431L01 ZR431LC02STOB TO92 2.5 1500 ZR431L02 ZR431LC01L TO92 1 LOOSE ZR431L01 ZR431LC02L TO92 2.5 LOOSE ZR431L02 TO92 Underside View ISSUE 2 - AUGUST 2003 1 SEMICONDUCTORS ZR431L ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Cathode Voltage VZ LIMIT Cathode Current UNIT 10 V 50 mA Operating Temperature T OMP -40 to 85 °C Storage Temperature T STG -55 to 125 °C RECOMMENDED OPERATING CONDITIONS PARAMETER MIN. MAX. Cathode Voltage V REF 10V Cathode Current 100A 25mA POWER DISSIPATION (at Tamb = 25°C unless otherwise stated) PACKAGE VALUE UNIT SOT23 330 mW TO92 600 mW ISSUE 2 - AUGUST 2003 SEMICONDUCTORS 2 ZR431L BLOCK DIAGRAM 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: V ref (ppm / C ) = V dev x 1000000 V ref (T 1− T 2) The dynamic output impedance, Rz, is defined as: RZ = ∆V Z ∆l Z When the device is programmed with two external resistors, R1 and R2, (fig 2), the dynamic output impedance of the overall circuit, R’, is defined as: R' = RZ (1+ R1 ) R2 ISSUE 2 - AUGUST 2003 3 SEMICONDUCTORS ZR431L ELECTRICAL CHARACTERISTICS (at Tamb = 25°C unless otherwise stated) PARAMETER Reference Voltage 2.5% 1.0% SYMBOL MIN. TYP. MAX. V ref 1.209 1.228 1.24 1.24 1.271 1.252 V V mV Vref UNIT CONDITIONS I L = 10mA (Fig1), V Z = V ref Deviation of Reference Input Voltage over Temperature V dev 4.0 8.0 Ratio of the change in Reference Voltage to the change in Cathode Voltage ∆Vref ∆VZ 0.5 2.0 Reference Input Current I ref 0.11 0.4 A R1 = 10k, R2 = O/C, l L = 10mA (fig2) Deviation of Reference Input Current over Temperature ∆I ref 0.02 0.2 A R1 = 10k, R2 = O/C, I L = 10mA T a = full range (Fig2) Minimum Cathode Current for Regulation I Zmin 30 100 A Off-state Current I Zoff 10 30 A Dynamic Output Impedance RZ 0.25 2 ⍀ 0.02 I L = 10mA, V Z = V ref T a = full range (Fig 1) mV/V V from V Z ref to 10V I Z = 10mA (Fig2) V Z = 10V, V ref = 0V (Fig3) V Z = V ref (Fig1), f = 0Hz, I L = 10mA DC TEST CIRCUITS Fig 1 - Test Circuit for VZ = Vref Fig 2 - Test Circuit for VZ > Vref Fig 3 - Test Circuit for Off State current ISSUE 2 - AUGUST 2003 SEMICONDUCTORS 4 ZR431L TYPICAL CHARACTERISTICS ISSUE 2 - AUGUST 2003 5 SEMICONDUCTORS ZR431L APPLICATIONS CIRCUITS ISSUE 2 - AUGUST 2003 SEMICONDUCTORS 6 ZR431L TYPICAL CHARACTERISTICS ISSUE 2 - AUGUST 2003 7 SEMICONDUCTORS ZR431L SOT23 PACKAGE OUTLINE AND PAD LAYOUT DETAILS PACKAGE OUTLINE PAD LAYOUT Controlling dimensions are in millimetres. Approximate conversions are given in inches PACKAGE DIMENSIONS Millimetres Inches DIM Millimetres Inches DIM Min Max Min Max Min Max A 2.67 3.05 0.105 0.120 G B 1.20 1.40 0.047 0.055 K 0.01 0.10 0.0004 0.004 C – 1.10 – 0.043 L 2.10 2.50 0.083 0.0985 D 0.37 0.53 0.0145 0.021 N F 0.085 0.15 0.0033 0.0059 NOM 1.9 NOM 0.95 Min Max NOM 0.037 NOM 0.037 ISSUE 2 - AUGUST 2003 SEMICONDUCTORS 8 ZR431L TO92 PACKAGE OUTLINE DETAILS PACKAGE OUTLINE Controlling dimensions are in millimetres. Approximate conversions are given in inches PACKAGE DIMENSIONS Millimetres Inches Millimetres DIM Inches DIM Min Max Min Max A 4.32 4.95 0.170 0.195 b 0.36 0.51 0.014 0.020 E 3.30 3.94 0.130 0.155 Min Max Min Max 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 e 2.41 2.67 0.095 0.105 D 4.45 4.95 0.175 0.195 e1 1.14 1.40 0.045 0.055 *° 4° 6° 4° 6° L 12.70 15.49 0.500 0.610 © Zetex plc 2003 Americas Asia Pacific Zetex GmbH Streitfeldstraße 19 D-81673 München Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY 11788 Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 [email protected] USA Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 [email protected] Zetex (Asia) Ltd 3701-04 Metroplaza Tower 1 Hing Fong Road Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 [email protected] Europe Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4444 Fax: (44) 161 622 4446 [email protected] These offices are supported by agents and distributors in major countries world-wide. This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. For the latest product information, log on to www.zetex.com ISSUE 2 - AUGUST 2003 9 SEMICONDUCTORS