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ZTLV431 1.24V Cost effective shunt regulator
Description
The ZTLV431 is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 20mA. The output voltage may be set to any chosen voltage between 1.24 volts and 10 volts by selection of two external divider resistors. The ZTLV431 can be used as a replacement for zener diodes in many applications requiring an improvement in zener performance. The ZTLV431 is available as standard as an A grade which has an initial tolerance of 1%; a B grade is planned with an initial tolerance of 0.5%, and all cover the -40C to 125C temperature range as standard.
Features
* * * Low voltage operation VREF = 1.24V Temperature range -40 to 125C Reference voltage tolerance at 25C * * * * * * * * * 0.5% ZTLV431B 1% ZTLV431A
Applications
* * * * Opto-coupler linearization Linear regulators Improved Zener Variable reference
Typical temperature drift 4 mV (0C to 70C) 6 mV (-40C to 85C) 11mV (-40C to 125C
Pin connections
ZTLV431_F (SOT23)
(top view)
100 A minimum cathode current 0.25 typical output impedance Adjustable output voltage 1.24V to 10V
Ref 1 3 Anode Cathode 2
Ordering information
Tol. Order code Package Part mark Status (*) SOT23-5 SOT23 SOT23F SOT23-5 SOT23 SOT23F S1A S1A S1A S1B S1B S1B Preview Active Preview Preview Preview Preview Reel size Tape width (inches) (mm) 7" (180mm) 8 7" (180mm) 8 7" (180mm) 8 7" (180mm) 8 7" (180mm) 8 7" (180mm) 8 Quantity per reel 3000 3000 3000 3000 3000 3000
ZTLV431AE5TA ZTLV431AFTA ZTLV431AFFTA ZTLV431BE5TA 0.5% ZTLV431BFTA ZTLV431BFFTA 1%
NOTES: (*) For availability of preview status devices contact your local Zetex sales representative
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ZTLV431
Absolute maximum ratings
Cathode voltage (VKA) Continuous cathode current (IKA) Reference input current range (IREF) Operating junction temperature Storage temperature 10V -20 to 20mA -0.05 to 3mA -40 to 150C -55 to 150C
Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability. Unless otherwise stated voltages specified are relative to the ANODE pin.
Package thermal data
Package
JA
PDIS TA =25C 500 mW 330 mW 780 mW
SOT23-5 SOT23 SOT23F
250C/W 380C/W 160C/W
Recommended operating conditions
Min. VKA cathode voltage IKA cathode current TA operating ambient temperature range VREF 0.1 -40 Max. 10 15 125 Units V mA C
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ZTLV431
Electrical characteristics (electrical characteristics over recommended operating conditions, TA = 25C, KKA = VREF, IKA = 10mA unless otherwise stated)
Symbol Parameter Conditions ZTLV431A ZTLV431B VREF Reference voltage TA = -40 to 85C TA = -40 to 125C Deviation of reference TA = -40 to 85C VREF(dev) voltage over full temperature range TA = -40 to 125C
V REF ---------------V KA
Min. 1.228 1.234 1.215 1.224 1.209 1.221
Typ. 1.24 1.24
Max. Units 1.252 1.246 1.265 1.259 1.271 1.265 V
ZTLV431A ZTLV431B ZTLV431A ZTLV431B
TA = 0 to 70C
4 6 11 -1.5 -1.5
12 20 31 -2.7 -2.7 mV/V A mV
6V Ratio of change in VKA from VREF to 10V reference voltage to the change in cathode IKA = 10mA voltage Reference input current IKA = 10mA, R1 = 10k ., R2 = OC TA = 0 to 70C TA = -40 to 85C TA = -40 to 125C TA = -40 to 125C
IREF IREF(dev) IKMIN IK(OFF) zKA
0.1 0.05 0.1 0.15 55 10 0.25
0.5 0.3 0.4 0.5 100 30 0.4
IKA = 10mA, IREF deviation over full R1 = 10k , temperature range R2 = OC Minimum cathode current for regulation Off-state current Dynamic output impedance VKA = VREF
A A A
VKA = 10V, VREF =0V VKA = VREF, f = <1kHz, IK = 0.1 to 15mA
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 DEV x 1000000 ppm V REF ------------ = ----------------------------------------Vmax C (T - T ) V
REF
1
2
The dynamic output impedance, ZKA, is defined as:
V K Z KA = --------I K
Vmin
When the device is programmed with two externalresistors, R1 and R2, (fig 2) , the dynamic output impedance of the overall circuit, Z', is defined as:
T1
Vdev = Vmax - Vmin
Z =
Z KA x ( 1 + R1 ) -----R2
Temperature
T2
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ZTLV431
Typical characteristics
IL
Input
VZ IZ
IL
Input
VZ IZ
Input
VZ IZOFF
Iref
R1 47nF
Iref
47nF
47nF
Vref
R2
Vref
Fig 1 - Test circuit for VZ = Vref
Fig 2 - Test circuit for VZ > Vref
Fig 3 - Test circuit for for Off state current
Pin connections - preview status devices
ZTLV431_FF (SOT23F)
(top view)
ZTLV431_E5 (SOT23-5)
(top view)
Ref 1
N/C 1
5 Anode
Cathode 2
Pre
v
iew Anode 3
*2 Cathode 3
Pre
w vie
4 Ref
* Pin 2 should be left floating
or connected to pin 5
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ZTLV431
Package outline - SOT23
E
e b 3 leads e1
L1
E1
D
A A1 L c
Dim. A A1 b C D e
Millimeters Min. 0.01 0.30 0.085 2.80 Max. 1.12 0.10 0.50 0.120 3.04 -
Inches Min. 0.0004 0.012 0.003 0.110 Max. 0.044 0.004 0.020 0.008 0.120
Dim. e1 E E1 L L1 -
Millimeters Min. 2.10 1.20 0.25 0.45 Max. 2.64 1.40 0.62 0.62 1.90 NOM
Inches Max. 0.083 0.047 0.018 0.018 Max. 0.104 0.055 0.024 0.024 0.075 NOM
0.95 NOM
0.0375 NOM
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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ZTLV431
Package outline - SOT23F
D b b L1 L c e1 e
E1
E
E2
b R A
A1
Dim. A A1 A2 b c D e e1
Millimeters Min. 0.80 0.06 0.39 0.11 2.80 Max. 1.00 0.10 0.16 0.41 0.20 3.00
Inches Min. 0.031 0.00 0.0024 0.0153 0.0043 0.1102 Max. 0.0394 0.0043 0.0006 0.0161 0.0079 0.1181
Dim. E E1 E2 L L1 R O -
Millimeters Min. 2.30 1.50 1.10 0.48 0.39 0.05 0 Max. 2.50 1.70 1.26 0.68 0.41 0.15 12 -
Inches Max. 0.0906 0.0590 0.0433 0.0189 0.0153 0.0019 0 Max. 0.0984 0.0669 0.0496 0.0268 0.0161 0.0059 12 -
0.95 ref 1.90 ref
0.0374 ref 0.7480 ref
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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ZTLV431
Package outline - SOT23-5
DIM A A1 A2 b C D E E1 e e1 L a Min. 0.90 0.00 0.90 0.20 0.09 2.70 2.20 1.30
Millimeters Max. 1.45 0.15 1.30 0.50 0.26 3.10 3.20 1.80 0.95 REF 1.90 REF 0.10 0 0.60 30 0.0039 0 Min. 0.0354 0.00 0.0354 0.0078 0.0035 0.1062 0.0866 0.0511
Inches Max. 0.0570 0.0059 0.0511 0.0196 0.0102 0.1220 0.1181 0.0708 0.0374 REF 0.0748 REF 0.0236 30
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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ZTLV431
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) 2007 Published by Zetex Semiconductors plc
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