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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.
Features
* * * * * 2.5% and 1% tolerance Max. temperature coefficient 50 ppm/C Temperature compensated for operation over -40 to 85C 100mA to 25mA current sink capability Surface mount SOT23 package
Applications
* * * * * Switch mode power supplies Shunt regulator Series regulator Voltage monitor Over voltage / under voltage protection
Ordering information
Device ZR431LF01TA ZR431LF02TA ZR431LC01STOB ZR431LC02STOB ZR431LC01L ZR431LC02L Pack SOT23 SOT23 TO92 TO92 TO92 TO92 Part mark 43M 43L ZR431L01 ZR431L02 ZR431L01 ZR431L02 Status Active Active Obsolete Obsolete Obsolete Obsolete Quantity per reel 3000 3000 1500 1500 Loose Loose Reel size (inches) 7 7 TOL % 1 2.5 1 2.5 1 2.5
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ZR431L
Absolute maximum ratings
Parameter Cathode voltage Cathode current Storage temperature Junction temperature TSTG TJ Symbol VZ Limit 10 50 -55 to 105 -40 to 125 Unit V mA C C
Power dissipation (at Tamb = 25C unless otherwise stated)
Package SOT23 Value 330 Unit mW
Recommended operating conditions
Parameter Cathode voltage Cathode current Operating temperature Min. VREF 100 A -40C Max. 10V 25mA 85C
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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:
Vref ( ppmIC) =
Vdev x1000000 Vref (T1 - T 2)
The dynamic output impedance, Rz, is defined as:
RZ
=
VZ I 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 Symbol 2.5% Vref 1.0% Vref Vdev Min. 1.209 1.228 Typ. 1.24 1.24 4.0 Max. 1.271 1.252 8.0 Unit V V mV Conditions IL = 10mA (Fig1), VZ = Vref IL = 10mA, VZ = Vref Ta = full range (Fig 1) VZ from Vref to 10V IZ = 10mA (Fig2) R1 = 10k, R2 = O/C, lL = 10mA (fig2) R1 = 10k, R2 = O/C, IL = 10mA Ta = full range (Fig2)
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 DC Test circuits
Vref VZ
Iref Iref IZmin IZoff RZ 0.02
0.5
2.0
mV/V
0.11 0.02
0.4 0.2
A A
30 10 0.25
100 30 2
A A VZ = 10V, Vref = 0V (Fig3) VZ = Vref(Fig1), f = 0Hz, IL = 10mA
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
140
Change in reference voltage (mV)
0 -1 -2 -3 -4 -5 -6 -7 -8 -9 0 2 4 6 8 10
Reference Current (nA)
130 120 110 100 90 80 -40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (C) Reference Current v Temperature
Cathode voltage (V) Change in reference voltage vs Cathode voltage
26
100
Minimum cathode current (A)
24
Dynamic Impedance ()
10 VREF = VKA IK = 1mA
22
20
1 IK = 10mA
18
16 -40
-25
-10
5
20
35
50
65
80
95
110
125
0.1 0.1
1
10
100
Temperature (C) Minimum cathode current vs temperature
Frequency (kHz) Dynamic impedance vs frequency
1.244
350 300 250 200 150 100 50
1.24
1.238
1.236
1.234
1.232 -42
Power dissipation (mW)
Reference voltage (V)
1.242
-25
-10
5
20
35
50
65
80
95
110
125
-40
-25
-10
-5
20
35
50
65
80
95
110
125
Temperature (C) Reference voltage vs Temperature
Ambient temperature (C) Power dissipation derating
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ZR431L
Application circuits
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ZR431L
Typical characteristics
60
Open loop gain (dB)
50 40 30 20 10 0
0
1
10
100
Frequency (kHz) Open loop gain vs frequency
2 Repetitive pulse Single pulse
Input Voltage swing (V)
VKA
1
0 5 2.5 0 -2.5 0 50 100 150 200 250 300 350 400 450 500 VIN
Time (s) Pulse response
30
Cathode current (mA)
25 20 15 10 5 0 0.01 0.1 1 10 100 1000 10000
Load capacitance (nF) Stability boundary conditions
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Output voltage swing (V)
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ZR431L
SOT23 Package outline and pad layout details
E
e b 3 leads e1
0.95 0.037
2.0 0.079
L1 E1 D
0.9 0.035 0.8 0.031
mm inches
A A1 L c
Dim.
Millimeters Min. Max. 1.12 0.10 0.50 0.20 3.04
Inches Min. 0.0004 0.012 0.003 0.110 Max. 0.044 0.004 0.020 0.008 0.120
Dim.
Millimeters Min. Max.
Inches Min. Max.
A A1 b c D e
0.01 0.30 0.085 2.80
e1 E E1 L L1 -
1.90 NOM 2.10 1.20 0.25 0.45 2.64 1.40 0.60 0.62 -
0.075 NOM 0.083 0.047 0.0098 0.018 0.104 0.055 0.0236 0.024 -
0.95 NOM
0.037 NOM
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches.
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ZR431L
TO92 Package outline
VZ GND Vref
1 2 3
Underside view
Dim. Min. A b E e e1 L R S1 W D * 4.32 0.36 3.30 2.41 1.14 12.70 2.16 1.14 0.41 4.45 4
Millimeters Max. 4.95 0.51 3.94 2.67 1.40 15.49 2.41 1.52 0.56 4.95 6 Min. 0.170 0.014 0.130 0.095 0.045 0.500 0.085 0.045 0.016 0.175 4
Inches Max. 0.195 0.020 0.155 0.105 0.055 0.610 0.095 0.060 0.022 0.195 6
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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ZR431L
Definitions Product change Zetex Semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or service. Customers are solely responsible for obtaining the latest relevant information before placing orders. Applications disclaimer The circuits in this design/application note are offered as design ideas. It is the responsibility of the user to ensure that the circuit is fit for the user's application and meets with the user's requirements. No representation or warranty is given and no liability whatsoever is assumed by Zetex with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Zetex does not assume any legal responsibility or will not be held legally liable (whether in contract, tort (including negligence), breach of statutory duty, restriction or otherwise) for any damages, loss of profit, business, contract, opportunity or consequential loss in the use of these circuit applications, under any circumstances. Life support Zetex 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 Zetex Semiconductors plc. 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. Reproduction The product specifications contained in this publication are 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. Terms and Conditions All products are sold subjects to Zetex' terms and conditions of sale, and this disclaimer (save in the event of a conflict between the two when the terms of the contract shall prevail) according to region, supplied at the time of order acknowledgement. For the latest information on technology, delivery terms and conditions and prices, please contact your nearest Zetex sales office. Quality of product Zetex is an ISO 9001 and TS16949 certified semiconductor manufacturer. To ensure quality of service and products we strongly advise the purchase of parts directly from Zetex Semiconductors or one of our regionally authorized distributors. For a complete listing of authorized distributors please visit: www.zetex.com/salesnetwork Zetex Semiconductors does not warrant or accept any liability whatsoever in respect of any parts purchased through unauthorized sales channels. ESD (Electrostatic discharge) Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices. The possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent of damage can vary from immediate functional or parametric malfunction to degradation of function or performance in use over time. Devices suspected of being affected should be replaced. Green compliance Zetex Semiconductors is committed to environmental excellence in all aspects of its operations which includes meeting or exceeding regulatory requirements with respect to the use of hazardous substances. Numerous successful programs have been implemented to reduce the use of hazardous substances and/or emissions. All Zetex components are compliant with the RoHS directive, and through this it is supporting its customers in their compliance with WEEE and ELV directives. Product status key: "Preview" Future device intended for production at some point. Samples may be available "Active" Product status recommended for new designs "Last time buy (LTB)" Device will be discontinued and last time buy period and delivery is in effect "Not recommended for new designs" Device is still in production to support existing designs and production "Obsolete" Production has been discontinued Datasheet status key: "Draft version" This term denotes a very early datasheet version and contains highly provisional information, which may change in any manner without notice. "Provisional version" This term denotes a pre-release datasheet. It provides a clear indication of anticipated performance. However, changes to the test conditions and specifications may occur, at any time and without notice. "Issue" This term denotes an issued datasheet containing finalized specifications. However, changes to specifications may occur, at any time and without notice. Zetex sales offices Europe Zetex GmbH Kustermann-park Balanstrae 59 D-81541 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 Highway 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 Corporate Headquarters Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom Telephone: (44) 161 622 4444 Fax: (44) 161 622 4446 hq@zetex.com
(c) 2008 Published by Zetex Semiconductors plc
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