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ZTL431, ZTL432 Cost effective adjustable precision shunt regulator
Description
The ZTL431 and ZTL432 are three terminal adjustable shunt regulators offering excellent temperature stability and output current handling capability up to 100mA. The output voltage may be set to any chosen voltage between 2.5 and 20 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 ZTL432 has the same electrical specifications as the ZTL431 but has a different pin out in SOT23 (F-suffix) and SOT23F (FF-suffix). Both variants are available in 2 grades with initial tolerances of 1% and 0.5% for the A and B grades respectively. These are functionally equivalent to the TL431/ TL432 except for maximum operation voltage, and have an ambient temperature range of -40 to 125C as standard.
Features
* * Temperature range ................ -40 to 125C Reference voltage tolerance at 25C * * * * * 0.2 0.5% ..................................... B grade 1% ......................................... A grade typical output impedance
Applications
* * * * Opto-coupler linearization Linear regulators Improved zener Variable reference
Sink current capability ...... 1mA to 100mA Adjustable output voltage ...... VREF to 20V
Pin connections ZTL431_F SOT23 ZTL431_FF SOT23F
(top view)
ZTL432_F SOT23 ZTL432_FF SOT23F
(top view)
ZTL431_H6 SC70-6
(top view)
Cathode 3 1 Anode Ref 2
Ref 3 1 Anode Cathode 2
Cathode 1 N/C 2 REF 3
6 Anode 5 N/C 4 NC
Connected internally to substrate; should be left floating or connected to Anode
ZTL431ASE5 SOT235
(top view)
ZTL431_E5 SOT235
(top view)
Cathode 1 Anode 2 Ref 3
5 N/C
N/C 1 N/C* 2
5 Anode
4 N/C
Cathode 3
4 Ref
* must be left floating
or connected to pin 5
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ZTL431, ZTL432
Ordering information
Tol. Order code ZTL431ACSTZ ZTL431AE5TA ZTL431AFFTA 1% ZTL431AFTA ZTL431AH6TA ZTL431ASE5TA ZTL432AFFTA ZTL432AFTA ZTL431BCSTZ ZTL431BE5TA ZTL431BFFTA 0.5% ZTL431BFTA ZTL431BH6TA ZTL432BFFTA ZTL432BFTA Pack TO92 SOT23-5 SOT23F SOT23 SC70-6 SOT23-5 SOT23F SOT23 TO92 SOT23-5 SOT23F SOT23 SC70-6 SOT23F SOT23 Part mark ZTL431A 31A 31A 31A 31A S2A 32A 32A ZTL431B 31B 31B 31B 31B 32B 32B Status* Obsolete Active Active Active Active Active Active Active Obsolete Active Active Active Active Active Active Reel Size Concertina 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm Concertina 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm 7", 180mm Tape width (mm) N/A 8 8 8 8 8 8 8 N/A 8 8 8 8 8 8 Quantity per reel 1500 3000 3000 3000 3000 3000 3000 3000 1500 3000 3000 3000 3000 3000 3000
NOTES: * For availability of preview status devices contact your local Zetex representative
Absolute maximum ratings
Cathode voltage (VKA) .............................................................. 20V Continuous cathode current (IKA) ........................................ 150mA Reference input current range (IREF)..................... -50 A to 10mA Operating junction temperature ................................. -40 to 150C Storage temperature ................................................... -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 TO92 SOT23 SOT23F SOT23-5 SOT70-6
JA
PDIS TA =25C, TJ = 150C 780mW 330mW 900mW 500mW 330mW
160C/W 380C/W 138C/W 250C/W 380C/W
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Recommended operating conditions
VKA IKA TA Cathode voltage Cathode current Operating ambient temperature range Min Vref 1 -40 Max 20 100 125 Units V mA C
Electrical characteristics
Electrical characteristics over recommended operating conditions, TA = 25C, unless otherwise stated. Symbol Parameter VREF Reference voltage VDEV Conditions VKA = VREF IKA = 10mA ZTL43_A ZTL43_B TA = 0 to 70 TA = -40 to 85C TA = -40 to 125C VKA = VREF to 10 IKA = 10mA VKA = 10V to 20V Min. 2.475 2.487 Typ. 2.5 2.5 6 14 14 -1.4 -1.0 Max. 2.525 2.513 16 34 34 -2.7 -2.0 mV/V mV Units V
Deviation of reference voltage over full VKA = VREF temperature range IKA = 10 mA Ratio of change in reference voltage to the change in cathode voltage Reference input current
VREF VKA
IREF
IKA = 10mA, R1 = 10k R2 = OC TA = 0 to 70C TA = -40 to 85C TA = -40 to 125C
2 0.8 0.8 0.8 0.4 0.1 0.2
4 1.2 2.5 2.5 0.6 0.5 0.5
A
IREF
IKA = 10mA IREF deviation over full R1 = 10k temperature range R2 = OC
A
IKA(MIN) Minimum cathode VKA = VREF current for regulation IKA(OFF) Off state current VKA = 20V, VREF = 0V Dynamic output VKA = VREF, f = 0Hz RZ impedance
mA A
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Typical characteristics
IKA = 10mA
VREF = VKA
1000
Power dissipation (mW)
900 800 700 600 500 400 300 200 100 0 0
SOT23F TO92 SOT23-5
SOT23 SC70-6
25
50
75
100
125
Ambient temperature (C)
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Typical characteristics
VKA
60 50 40 30 20 10 0 100
IKA
Gain (dB)
1000
10000
100000
1000000
Frequency (Hz)
IKA
Gain vs Frequency
VKA
VKA
VKA
100 90
Cathode Current (mA)
80 70 60 50 40 30 20 10 0 10.0E-12 100.0E-12 1.0E-9 10.0E-9 100.0E-9 1.0E-6
IKA
Load Capacitance (F)
Stability Boundary Condition
VREF < VKA < 20, IKA = 10mA, TA = 25C
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Application cicuits
V+ R1 VREF VREF VOUT V+ R1 VOUT
R2
R2
VOUT
VREF
VOUT
VREF
Shunt regulator
Higher current shunt regulator
V+ ZSR*** V+ In Out Common R1 0.01 F VREF R1 R2 VOUT(MIN) = VREF + VREG VOUT VREF VOUT VREF VOUT VREF R2 VOUT 30
Output control of a three terminal fixed regulator
Series regulator
V+ V+ R1 R1 Output Input VTH = 2.5V VON~ 2V VOFF = V+ R2a R2b VREF VREF Output
VREF VREF
Single supply comparator with temperature compensated threshold
Over voltage / under voltage protection circuit
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DC test circuits
IL VKA IL VKA VKA
IKA IREF IREF
IKA
IKA(OFF)
VREF
VREF
Figure 1 Test circuit for VKA = VREF
Figure 2 Test circuit for VKA > VREF
Figure 3 Test circuit for off state current
Notes
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 1, 000, 000 V REF ( ppmC ) = -----------------------------------------------V REF ( T1 - T2 ) V z R z = --------I z
The dynamic output impedance, Rz, is defined as:
When the device is programmed with two external resistors, R1 and R2, (fig 2), the dynamic output impedance of the overall circuit, R'z, is defined as:
R' z = R z 1 + R1 ----- R2 Stability boundary
The ZTL431 and ZTL432 are stable with a range of capacitive loads. A zone of instability exists as demonstrated in the typical characteristic graph on page 5. The graph shows typical conditions. To ensure reliable stability a capacitor of 4.7nF or greater is recommended between anode and cathode.
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Pin connections - obsolete devices
ZTL431_C TO92
(underside view)
Vz Gnd Vref
O
le bso2
3
1
te
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Packaging details - SOT23
E
Dim. Millimeters A A1
e
Inches Max. 0.044 -
Dim. e1 E E1 L L1 -
Millimeters Min. 2.10 1.20 0.25 0.45 1.90 NOM 2.64 1.40 0.62 0.62 -
Inches Max. 0.075 NOM 0.083 0.104 0.047 0.055 0.018 0.024 0.018 0.024 -
Min. Max. Min. 1.12
Max. Max.
0.01 0.10 0.0004 0.004 0.30 0.50 0.012 0.020 0.085 0.120 0.003 0.008 2.80 3.04 0.110 0.120 0.95 NOM 0.0375 NOM
b
e1
b 3 leads
C D e
L1
E1
D
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
A A1 L c
Package details - SC70-6
Dim. Millimeters Min. A A1 A2 b C D 0.80 0.80 0.15 0.08 Max. 0.10 0.30 Inches Min. Max. Dim Millimeters Inches . Min. Max. Max. Max. E e L 2.10 BSC 1.25 0.65 BSC 1.30 BSC 0.26 0 8 0.0826 BSC 0.0255 BSC 0.0511 BSC 0 8 1.35 0.0492 0.0531
1.10 0.0315 0.0433 1.00 0.0315 0.0394 0.25 0.0031 0.0098 0.0787 BSC
0.0039 E1
0.006 0.0118 e1
0.46 0.0102 0.0181
2.00 BSC
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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Package details SOT23F
D b b L1 L c e1 e
Dim. Millimeters A A1 A2 b c
Inches Max.
Dim. Millimeters Min. E 2.30 1.50 1.10 0.48 0.39 0.05 0 -
Inches Max.
Min. Max. Min. 0.10
Max. Max.
0.80 1.00 0.031 0.0394
2.50 0.0906 0.0984 1.70 0.0590 0.0669 1.26 0.0433 0.0496 0.68 0.0189 0.0268 0.41 0.0153 0.0161 0.15 0.0019 0.0059 12 0 12 -
0.00 0.0043 E1 L R O -
E1
E
0.06 0.16 0.0024 0.0006 E2 0.39 0.41 0.0153 0.0161 2.80 3.00 0.1102 0.1181 0.95 ref 1.90 ref 0.0374 ref 0.7480 ref 0.11 0.20 0.0043 0.0079 L1
b R A
A1
D e e1
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
Package details - TO92
Dim. A b C E e e1 L R S1 W D * Millimeters Min. 4.32 0.36 2.50 3.30 4.88 2.44 12.70 2.16 1.14 0.41 4.45 4 Max. 4.95 0.51 3.50 3.94 5.88 2.94 15.49 2.41 1.52 0.56 4.95 6 Min. 0.170 0.014 0.099 0.130 0.192 0.096 0.500 0.085 0.045 0.016 0.175 4 Inches Max. 0.195 0.020 0.138 0.155 0.232 0.116 0.610 0.095 0.060 0.022 0.195 6
C
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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Packaging details - SOT23-5
Dim. A A1 A2 b C D E E1 e e1 L a 0.10 0 Millimeters Min. 0.90 0.00 0.90 0.20 0.09 2.70 2.20 1.30 0.95 REF 1.90 REF 0.60 30 0 Max. 1.45 0.15 1.30 0.50 0.26 3.10 3.20 1.80 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 0.0039 0.0236 30
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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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 labelling 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 Kustermannpark 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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