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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.
Pin connections
ZTLV431_F (SOT23)
(top view)
Ref 1 3 Anode Cathode 2
Features
* * * Low voltage operation VREF = 1.24V Temperature range -40 to 125C Reference voltage tolerance at 25C * * * * * * * * * 0.5% ZTLV431B 1% ZTLV431A 4 mV (0C to 70C) 6 mV (-40C to 85C) 11mV (-40C to 125C) typical output impedance
ZTLV431_E5 (SOT23-5)
(top view)
ZTLV431_FF (SOT23F)
(top view)
Ref 1
Cathode 2
Pre
w vie 3 Anode
Typical temperature drift
100 A minimum cathode current 0.25
N/C 1 N/C 2 Cathode 3
5 Anode
Adjustable output voltage 1.24V to 10V
Applications
* * * * Opto-coupler linearization Linear regulators Improved Zener Variable reference
Pre
v
iew
4 Ref
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 7" (180mm) 7" (180mm) 7" (180mm) 7" (180mm) 7" (180mm) 7" (180mm) Tape width (mm) 8 8 8 8 8 8 Quantity per reel 3,000 3,000 3,000 3,000 3,000 3,000
ZTLV431AE5TA 1% ZTLV431AFTA ZTLV431AFFTA ZTLV431BE5TA 0.5% ZTLV431BFTA ZTLV431BFFTA
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
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ZTLV431
Intentionally left blank
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ZTLV431
Package outline - SOT23
L H N D 3 leads G
M
B
A
C K
F
Dim. A B C D F G
Millimeters Min. 2.67 1.20 0.37 0.085 Max. 3.05 1.40 1.10 0.53 0.15
Inches Min. 0.105 0.047 0.015 0.0034 Max. 0.120 0.055 0.043 0.021 0.0059
Dim. H K L M N -
Millimeters Min. 0.33 0.01 2.10 0.45 Max. 0.51 0.10 2.50 0.64 -
Inches Max. 0.013 0.0004 0.083 0.018 Max. 0.020 0.004 0.0985 0.025 -
0.95 NOM
0.0375 NOM
1.90 NOM
0.075 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
A2
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
Europe 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 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
For international sales offices visit www.zetex.com/offices Zetex products are distributed worldwide. For details, see www.zetex.com/salesnetwork 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 contact 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.
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