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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 * 100 A 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
DEVICE ZR431LF01TA ZR431LF02TA ZR431LC01STOB ZR431LC02STOB ZR431LC01L ZR431LC02L PACK SOT23 SOT23 TO92 TO92 TO92 TO92 TOL % 1 2.5 1 2.5 1 2.5 LOOSE LOOSE REEL SIZE 7" 7" QUANTITY PER REEL 3000 3000 1500 1500 PART MARK 43M 43L ZR431L01 ZR431L02 ZR431L01 ZR431L02
Top View
TO92 Underside View
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SEMICONDUCTORS
ZR431L
ABSOLUTE MAXIMUM RATINGS
PARAMETER Cathode Voltage Cathode Current Operating Temperature Storage Temperature T OMP T STG SYMBOL VZ LIMIT 10 50 -40 to 85 -55 to 125 UNIT V mA C C
RECOMMENDED OPERATING CONDITIONS
PARAMETER Cathode Voltage Cathode Current MIN. V REF 100 A MAX. 10V 25mA
POWER DISSIPATION (at Tamb = 25C unless otherwise stated)
PACKAGE SOT23 TO92 VALUE 330 600 UNIT mW mW
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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
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ZR431L
ELECTRICAL CHARACTERISTICS (at Tamb = 25C unless otherwise stated)
PARAMETER Reference Voltage 2.5% 1.0% SYMBOL V ref
Vref
MIN. 1.209 1.228
TYP. 1.24 1.24 4.0 0.5
MAX. 1.271 1.252 8.0 2.0
UNIT CONDITIONS V V mV I L = 10mA (Fig1), V Z = V ref I L = 10mA, V Z = V ref T a = full range (Fig 1)
Deviation of Reference Input Voltage over Temperature Ratio of the change in Reference Voltage to the change in Cathode Voltage Reference Input Current Deviation of Reference Input Current over Temperature Minimum Cathode Current for Regulation Off-state Current Dynamic Output Impedance
V dev Vref VZ I ref I ref 0.02
mV/V V from V Z ref to 10V I Z = 10mA (Fig2) A A R1 = 10k, R2 = O/C, l L = 10mA (fig2) R1 = 10k, R2 = O/C, I L = 10mA T a = full range (Fig2)
0.11 0.02
0.4 0.2
I Zmin I Zoff RZ
30 10 0.25
100 30 2
A A 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
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ZR431L
TYPICAL CHARACTERISTICS
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ZR431L
APPLICATIONS CIRCUITS
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ZR431L
TYPICAL CHARACTERISTICS
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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 DIM Min A B C D F 2.67 1.20 - 0.37 0.085 Max 3.05 1.40 1.10 0.53 0.15 Min 0.105 0.047 - 0.0145 0.0033 Max 0.120 0.055 0.043 0.021 0.0059 G K L N Inches DIM Min Max Min Max NOM 1.9 0.01 2.10 0.10 2.50 NOM 0.037 0.0004 0.083 0.004 0.0985 Millimetres Inches
NOM 0.95
NOM 0.037
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ZR431L
TO92 PACKAGE OUTLINE DETAILS PACKAGE OUTLINE
Controlling dimensions are in millimetres. Approximate conversions are given in inches
PACKAGE DIMENSIONS
Millimetres DIM Min A b E e e1 L 4.32 0.36 3.30 2.41 1.14 12.70 Max 4.95 0.51 3.94 2.67 1.40 15.49 Min 0.170 0.014 0.130 0.095 0.045 0.500 Max 0.195 0.020 0.155 0.105 0.055 0.610 R S1 W D * Inches DIM Min 2.16 1.14 0.41 4.45 4 Max 2.41 1.52 0.56 4.95 6 Min 0.085 0.045 0.016 0.175 4 Max 0.095 0.060 0.022 0.195 6 Millimetres Inches
(c) Zetex plc 2003
Europe Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4444 Fax: (44) 161 622 4446 hq@zetex.com Zetex GmbH Streitfeldstrae 19 D-81673 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com Americas Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY 11788 USA Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 usa.sales@zetex.com Asia Pacific Zetex (Asia) Ltd 3701-04 Metroplaza Tower 1 Hing Fong Road Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 asia.sales@zetex.com
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
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SEMICONDUCTORS

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