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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% and covers 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 * * * * * * * 1% ZTLV431A 4 mV (0C to 70C) 6 mV (-40C to 85C) 11mV (-40C to 125C typical output impedance Typical temperature drift
Applications
* * * * Opto-coupler linearization Linear regulators Improved Zener Variable reference
Pin connections
ZTLV431_F (SOT23)
(top view)
100 A minimum cathode current 0.25
Ref 3 1 Anode Cathode 2
Adjustable output voltage 1.24V to 10V
Ordering information
Tol. 1% Order code ZTLV431AFTA Package Part mark SOT23 S1A Status Active Reel size Tape width (inches) (mm) 7" (180mm) 8 Quantity per reel 3,000
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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 330 mW 780 mW
SOT23 SOT23F
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 VREF Parameter Reference voltage Conditions ZTLV431A TA = -40 to 85C ZTLV431A TA = -40 to 125C ZTLV431A T = 0 to 70C Deviation of reference A TA = -40 to 85C VREF(dev) voltage over full temperature range TA = -40 to 125C
V REF ---------------V KA
Min. 1.228 1.215 1.209
Typ. 1.24
Max. Units 1.252 1.265 V 1.271
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 I = 10mA,
KA
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
IREF deviation over full R1 = 10k , temperature range R2 = OC Minimum cathode current for regulation Off-state current Dynamic output impedance
TA = -40 to 85C TA = -40 to 125C TA = -40 to 125C
A A A
VKA = VREF
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 V (T - T )
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 (
R + R
)
Temperature
T2
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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 ()
VREF = VKA
10
IK = 1mA
22
20
IK = 10mA
1
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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Typical characteristics
60 2 50 40 30 20 10 0
Output voltage swing (V)
Open loop gain (dB)
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
0
1
10
100
Frequency (kHz) Open loop gain vs frequency
Time (s) Pulse response
30 25 20 15 10 5 0 0.01 0.1 1 10 100 1000 10000
Cathode current (mA)
Load capacitance (nF) Stability boundary conditions
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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)
Ref 1
Cathode 2
v Pre
iew Anode 3
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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 0.20 3.04 -
Inches Min. 0.0004 0.012 0.003 0.110 Max. 0.044 0.004 0.020 0.008 0.120
Dim. e1 E E1 L L1 -
Millimeters Min. 2.10 1.20 0.25 0.45 Max. 2.64 1.40 0.60 0.62 1.90 NOM
Inches Min. 0.083 0.047 0.0098 0.018 Max. 0.104 0.055 0.0236 0.024 0.075 NOM
0.95 NOM
0.037 NOM
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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