DIODES ZTLV431

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.
Features
Applications
•
Low voltage operation VREF = 1.24V
•
Opto-coupler linearization
•
Temperature range -40 to 125°C
•
Linear regulators
•
Reference voltage tolerance at 25°C
•
Improved Zener
•
•
Variable reference
•
•
The ZTLV431 is available as standard as an
A grade which has an initial tolerance of 1%
and covers the -40°C to 125°C temperature
range as standard.
1% ZTLV431A
Typical temperature drift
Pin connections
•
4 mV (0°C to 70°C)
•
6 mV (-40°C to 85°C)
•
11mV (-40°C to 125°C
ZTLV431_F (SOT23)
(top view)
100␮A minimum cathode current
•
0.25⍀ typical output impedance
•
Adjustable output voltage 1.24V to 10V
Ref 3
1 Anode
Cathode 2
Ordering information
Tol.
Order code
1%
ZTLV431AFTA
Issue 7 - April 2008
© Zetex Semiconductors plc 2008
Package Part mark
SOT23
Status
S1A
Active
1
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)
10V
Continuous cathode current (IKA)
-20 to 20mA
Reference input current range (IREF)
-0.05 to 3mA
Operating junction temperature
-40 to 150°C
Storage temperature
-55 to 150°C
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
⍜JA
PDIS
TA =25°C
SOT23
380°C/W
330 mW
SOT23F
160°C/W
780 mW
Package
Recommended operating conditions
Min.
Max.
Units
VKA cathode voltage
VREF
10
V
IKA cathode current
0.1
15
mA
TA operating ambient temperature range
-40
125
°C
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ZTLV431
Electrical characteristics (electrical characteristics over recommended operating
conditions, TA = 25°C, KKA = VREF, IKA = 10mA unless otherwise stated)
Symbol
VREF
Parameter
Conditions
Reference voltage
Min.
Typ.
Max. Units
ZTLV431A
1.228
1.24
1.252
TA = -40 to 85°C ZTLV431A
1.215
1.265 V
TA = -40 to 125°C ZTLV431A
1.209
1.271
T = 0 to 70°C
Deviation of reference A
TA = -40 to 85°C
VREF(dev) voltage over full
temperature range
TA = -40 to 125°C
4
12
6
20
11
31
mV
ΔV REF
----------------ΔV KA
6V
Ratio of change in
VKA from VREF to 10V
reference voltage to
the change in cathode IKA = 10mA
voltage
-1.5
-2.7
-1.5
-2.7
mV/V
IREF
Reference input current
0.1
0.5
µA
TA = 0 to 70°C
0.05
0.3
IREF(dev)
IKA = 10mA,
IREF deviation over full
R1 = 10k⍀,
temperature range
R2 = OC
TA = -40 to 85°C
0.1
0.4
TA = -40 to 125°C
0.15
0.5
IKMIN
Minimum cathode
current for regulation
VKA = VREF
TA = -40 to 125°C
55
100
µA
IK(OFF)
Off-state current
VKA = 10V, VREF =0V
10
30
µA
zKA
Dynamic output
impedance
VKA = VREF, f = <1kHz,
IK = 0.1 to 15mA
0.25
0.4
⍀
IKA = 10mA, R1 = 10k⍀., R2 = OC
µA
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:
Δ VK
Z KA = ---------Δ IK
Vmin
Vdev = Vmax - 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
Z′ = Z KA x (
R
+
R
)
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Temperature
T2
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Change in reference voltage (mV)
Typical characteristics
Reference Current (nA)
140
130
120
110
100
90
80
-40
-25
-10
5
20
35
50
65
80
95
110
125
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
0
Dynamic Impedance (Ω)
Minimum cathode current (µA)
4
24
22
20
18
-25
-10
5
20
35
50
65
80
95
110
10
IK = 1mA
10
IK = 10mA
1
0.1
0.1
125
1
1.244
350
1.242
300
1.24
1.238
1.236
1.234
-25
-10
5
20
35
50
65
80
95
110
© Zetex Semiconductors plc 2008
100
250
200
150
100
50
-40
125
-25
-10
-5
20
35
50
65
80
95
110
125
Ambient temperature (°C)
Power dissipation derating
Temperature (°C)
Reference voltage vs Temperature
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10
Frequency (kHz)
Dynamic impedance vs frequency
Power dissipation (mW)
Reference voltage (V)
8
VREF = VKA
Temperature (°C)
Minimum cathode current vs temperature
1.232
-42
6
100
26
16
-40
2
Cathode voltage (V)
Change in reference voltage vs Cathode voltage
Temperature (°C)
Reference Current v Temperature
4
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Typical characteristics
Repetitive
pulse
40
Single
pulse
30
Input Voltage swing (V)
Open loop gain (dB)
2
50
20
10
0
0
1
10
1
0
5
2.5
VIN
0
-2.5
0
100
VKA
Output voltage swing (V)
60
50
100
150
200
250
300
350
400
450
500
Time (μs)
Pulse response
Frequency (kHz)
Open loop gain vs frequency
Cathode current (mA)
30
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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ZTLV431
Typical characteristics
IL
IL
VZ
Input
IZ
Iref
R1
47nF
Vref
R2
Fig 1 - Test circuit for VZ = Vref
VZ
Input
Input
IZ
Iref
VZ
IZOFF
47nF
47nF
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
iew
3 Anode
v
Pre
Cathode 2
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ZTLV431
Package outline - SOT23
E
e
e1
b
3 leads
L1
D
E1
A
A1
Dim.
L
c
Millimeters
Inches
Dim.
Millimeters
Min.
Max.
Min.
Max.
A
-
1.12
-
0.044
e1
A1
0.01
0.10
0.0004
0.004
E
2.10
2.64
0.083
0.104
b
0.30
0.50
0.012
0.020
E1
1.20
1.40
0.047
0.055
c
0.085
0.20
0.003
0.008
L
0.25
0.60
0.0098
0.0236
D
2.80
3.04
0.110
0.120
L1
0.45
0.62
0.018
0.024
-
-
-
-
-
e
0.95 NOM
Min.
0.037 NOM
Max.
Inches
1.90 NOM
Min.
Max.
0.075 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.
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USA
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United Kingdom
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Fax: (1) 631 360 8222
usa.sales@zetex.com
Telephone: (852) 26100 611
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© 2007 Published by Zetex Semiconductors plc
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