TLV431Q [DIODES]
AUTOMOTIVE-COMPLIANT 1.24V SHUNT REGULATOR;
| 型号： | TLV431Q |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | AUTOMOTIVE-COMPLIANT 1.24V SHUNT REGULATOR |
| 文件： | 总14页 (文件大小：1609K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TLV431Q
AUTOMOTIVE-COMPLIANT 1.24V SHUNT REGULATOR
Description
Pin Assignments
The TLV431Q 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 and 18 volts by selection of two external divider
resistors.
(Top View)
REF
1
2
3
ANODE
The TLV431Q can be used as a replacement for Zener diodes in
many applications requiring an improvement in Zener performance.
CATHODE
SOT23
(Top View)
The TLV431Q is available in 3 tolerance bands with initial tolerances
of 1%, 0.5%, and 0.2% for the A, B and T bands respectively.
N/C
N/C‡
1
2
3
5
ANODE
REF
The TLV431Q is qualified to AEC-Q100 Grade 1 and is automotive-
compliant supporting PPAP documentation.
CATHODE
4
SOT25
‡ Pin should be left floating or connected to anode
Features
Low Voltage Operation, VREF = 1.24V
Temperature Range -40 to +125°C
Reference Voltage Tolerance at +25°C
Typical Application Circuit
.
.
.
0.2%
0.5%
1%
TLV431TQ
TLV431BQ
TLV431AQ
Typical VREF Deviation across Full Temperature Range (Note 1)
.
4mV (0°C to +70°C)
.
.
6mV (-40°C to +85°C)
11mV (-40°C to +125°C)
80µA Minimum Cathode Current
0.25Ω Typical Output Impedance
Adjustable Output Voltage VREF to 18V
Totally Lead-Free & Fully RoHS Compliant (Notes 2 & 3)
Halogen and Antimony Free. “Green” Device (Note 4)
Qualified to AEC-Q100 Grade 1
Adjustable High Accuracy Shunt Reference
PPAP Capable (Note 5)
Notes:
1. The VREF deviation is defined as the differences between the maximum and minimum values obtained over the specified temperature range.
2. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
3. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
4. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
5. Automotive products are AEC-Q100 qualified and are PPAP capable. Refer to https://www.diodes.com/quality/.
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TLV431Q
Document number: DS36915 Rev. 3 - 2
TLV431Q
Absolute Maximum Ratings (Note 6)
Symbol
VKA
Parameter
Rating
20
Unit
V
Cathode Voltage
Continuous Cathode Current
Reference Input Current Range
Input Supply Voltage (Relative to Ground)
Operating Junction Temperature
Storage Temperature
-20 to +20
-0.05 to +3
-0.03 to +18
-40 to +150
-65 to +150
mA
mA
V
IKA
IREF
VIN
°C
°C
TJ
TS
ESD Susceptibility
HBM
MM
Human Body Model
Machine Model
4
400
1
kV
V
CDM
Charged Device Model
kV
Notes: 6. a) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these conditions is not implied. Exposure to absolute-maximum-rated conditions for extended period may affect
device reliability.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling
and transporting these devices.
b) Ratings apply to ambient temperature at +25°C.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
VKA
Parameter
Min
VREF
0.1
Max
18
Unit
V
Cathode Voltage
Cathode Current
IKA
15
mA
°C
Operating Ambient Temperature Range
TA
-40
+125
Package Thermal Data
PDIS
Package
JA
TA = +25°C, TJ = +150°C
SOT23
SOT25
380°C/W
250°C/W
330mW
500mW
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Document number: DS36915 Rev. 3 - 2
TLV431Q
Electrical Characteristics (@TA = +25°C, IK = 10mA, unless otherwise specified.)
Symbol
Parameter
Conditions
Min
1.228
1.234
1.2375
1.221
1.227
1.230
1.215
1.224
1.228
1.209
1.221
1.224
—
Typ
1.24
1.24
1.24
—
Max
Unit
TLV431AQ
TLV431BQ
1.252
1.246
1.2425
1.259
1.253
1.250
1.265
1.259
1.252
1.271
1.265
1.255
12
VKA = VREF
,
TA = +25°C
TLV431TQ
TLV431AQ
VKA = VREF
,
TLV431BQ
—
TA = 0 to +70°C
TLV431TQ
—
Reference Voltage
V
VREF
TLV431AQ
—
VKA = VREF
,
TLV431BQ
—
TA = -40 to +85°C
TLV431TQ
—
TLV431AQ
—
VKA = VREF
,
TLV431BQ
—
TA = -40 to +125°C
TLV431TQ
—
4
TA = 0 to +70°C
TA = -40 to +85°C
TA = -40 to +125°C
Deviation of Reference
Voltage Over Full
Temperature Range
VREF(DEV)
(Note 7)
—
6
20
mV
VKA = VREF
—
11
31
Ratio of Change in
Reference Voltage to
the Change in Cathode
Voltage
6V
—
—
-1.5
-1.5
-2.7
-2.7
ΔVREF
ΔVKA
mV/V
µA
VKA for VREF to
18V
Reference Input Current
—
—
—
—
—
—
—
—
0.15
0.05
0.1
0.5
0.3
0.4
0.5
80
IREF
R1 = 10kΩ, R2 = OC
TA = 0 to +70°C
TA = -40 to +85°C
TA = -40 to +125°C
TA = 0 to +70°C
R1 = 10kΩ,
IREF(DEV)
(Note 7)
IREF Deviation Over Full
Temperature Range
µA
R2 = OC
0.15
55
Minimum Cathode
Current for Regulation
55
80
µA
IKMIN
VKA = VREF
TA = -40 to +85°C
TA = -40 to +125°C
55
100
0.1
Off-State Current
0.001
µA
IK(OFF)
VKA = 18V, VREF = 0V
VKA = VREF, f = <1kHz
IK = 0.1 to 15mA
Dynamic Output
Impedance
—
0.25
0.4
Ω
ZKA (Note 8)
Notes:
7. The deviation parameters VREF(DEV) and IREF(DEV) are defined as the differences between the maximum and minimum values across the specified
temperature range. The average full-range temperature coefficient of the reference input voltage, dVREF/dT, is defined as:
VRꢀꢁ DꢀV
ꢂ
ꢃ
ꢀ
ꢁ ×10ꢅ
dVRꢀꢁ ppm
ꢀ
VRꢀꢁ(ꢂꢃ=ꢄ5°C
ꢁ =
dꢂ
ꢆꢂꢃ
°C
where ΔꢂA is the rated operating free-air temperature range of the device.
dVREF/dT can be positive or negative, depending on whether minimum VREF or maximum VREF, respectively, occurs at the lower temperature.
8. The dynamic impedance is defined as:
ꢆVꢈꢃ
ꢄ
ꢄ
=
ꢇꢈꢃ
ꢆIꢈꢃ
When the device is operating with two external resistors (see Typical Application Circuit Figure 1), the total dynamic impedance of the circuit is increased
R1
by a factor of ꢅ1+
ꢆ
ꢇ.
Rꢄ
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Document number: DS36915 Rev. 3 - 2
TLV431Q
Typical Characteristics
5ꢅkΩ
O/P
75kΩ
IK
S1
100nF
10mA
10kΩ
Test Circuit for VREF Measurement
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Document number: DS36915 Rev. 3 - 2
TLV431Q
Typical Characteristics (Cont.)
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TLV431Q
Typical Characteristics (Cont.)
3V
1kΩ
470µF
750Ω
O/P
Test Circuit for Input Noise Voltage
O/P
ꢅ.8kΩ
IK
180Ω
10µF
5V
4.3kΩ
Test Circuit for Phase Shift and Gain
100Ω
100µF
O/P
100Ω
50Ω
Test Circuit for Reference Impedance
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TLV431Q
Typical Characteristics (Cont.)
O/P
Pulse
Generator
Test Circuit for Pulse Response
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TLV431Q
Application Notes
In a conventional shunt regulator application (Figure 1), an external series resistor (R3) is connected between the supply voltage, VIN, and the
TLV431Q. The 0.5% and 0.2% tolerance versions allow the creation of a high accuracy adjustable shunt reference.
R3 determines the current that flows through the load (IL) and the TLV431Q (IK). The TLV431Q will adjust how much current it sinks or “shunts”
to maintain a voltage equal to VREF across its feedback pin. Since load current and supply voltage may vary, R3 should be small enough to
supply at least the minimum acceptable IKMIN to the TLV431Q even when the supply voltage is at its minimum and the load current is at its
maximum value. When the supply voltage is at its maximum and IL is at its minimum, R3 should be large enough so that the current flowing
through the TLV431Q is less than 15mA.
R3 is determined by the supply voltage, (VIN), the load and operating current, (IL and IK), and the TLV431Q’s reverse breakdown voltage, VKA
.
V
VKA
IL IK
IN
R3
where
1
R
VKA VREF 1
R2
and VKA = VOUT
Figure 1. Adjustable Low Voltage Reference
The values of R1 and R2 should be large enough so that the current flowing through them is much smaller than the current through R3 yet not
too large so that the voltage drop across them caused by IREF affects the reference accuracy.
Printed Circuit Board Layout Considerations
The TLV431Q in the SOT25 package has the die attached to pin 2, which results in an electrical contact between pin 2 and pin 5. Therefore, pin
2 of the SOT25 package must be left floating or connected to pin 5.
Other Applications of the TLV431Q
R1
R2
VOUT VREF 1
V
VOUT
ISH IB
IN
R3
VBE
R4
IB
ISH
IB 15mA
h
FE(min)
Figure 2. High Current Shunt Regulator
It may at times be required to shunt-regulate more current than the 15mA that the TLV431Q is capable of.
Figure 2 shows how this can be done using transistor Q1 to amplify the TLV431Q’s current. Care needs to be taken that the power dissipation
and/or SOA requirements of the transistor is not exceeded.
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TLV431Q
Document number: DS36915 Rev. 3 - 2
TLV431Q
Application Notes (Cont.)
R1
R2
VOUT VREF 1
V
(VOUT VBE
)
IN
R3
IB
IOUT(max)
IB 15mA
hFE(min)
Figure 3. Basic Series Regulator
A very effective and simple series regulator can be implemented as shown in Figure 3 above. This may be preferable if the load requires more
current than can be provided by the TLV431Q alone and there is a need to conserve power when the load is not being powered. This circuit also
uses one component less than the shunt circuit shown in Figure 3 above.
R1
R2
VOUT VREF 1
V
IN (VOUT VBE)
R3
IB
IOUT(max)
IB 18mA
hFE(min)
VREF
RS
IOUT(max)
Figure 4. Series Regulator with Current Limit
Figure 4 adds current limit to the series regulator in Figure 3 using a second TLV431Q. For currents below the limit, the circuit works normally
supplying the required load current at the design voltage. However, should attempts be made to exceed the design current set by the second
TLV431Q, the device begins to shunt current away from the base of Q1. This begins to reduce the output voltage and thus ensuring that the
output current is clamped at the design value. Subject only to Q1’s ability to withstand the resulting power dissipation, the circuit can withstand
either a brief or indefinite short circuit.
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TLV431Q
Document number: DS36915 Rev. 3 - 2
TLV431Q
Application Notes (Cont.)
R1
R2
VOUT VREF 1
VOUT (VREG VREF
)
(All features of the regulator
such as short circuit protection,
thermal shutdown, etc, are
maintained.)
Figure 5. Increasing Output Voltage of a Fixed Linear Regulator
One of the useful applications of the TLV431Q is in using it to improve the accuracy and/or extend the range and flexibility of fixed voltage
regulators. In the circuit in Figure 5 above both the output voltage and its accuracy are entirely determined by the TLV431Q, R1 and R2.
However, the rest of the features of the regulator (up to 1A output current, output current limiting and thermal shutdown) are all still available.
R1
R2
VOUT VREF 1
VOUT (VREG VREF
)
)
VIN (VOUT VREG
R3
IB
0.1mA IB 18mA
(All features of the regulator
such as short circuit
protection, thermal shutdown,
etc, are maintained.)
Figure 6. Adjustable Linear Voltage Regulator
Figure 6 is similar to Figure 5 with adjustability added. Note the addition of R3, This is added to provide sufficient bias current for the TLV431Q.
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TLV431Q
Document number: DS36915 Rev. 3 - 2
TLV431Q
Ordering Information
Quanity per
Reel
Compliance/Qualification
(Note 10)
Package Identification
Tol.
1%
Part Number
Reel Size
Tape Width
(Note 9)
SOT25
SOT23
SOT25
SOT23
SOT23
Code
V1A
V1A
V1B
V1B
V1T
TLV431AQE5TA
TLV431AQFTA
TLV431BQE5TA
TLV431BQFTA
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
7”, 180mm
8mm
8mm
8mm
8mm
8mm
3,000
3,000
3,000
3,000
3,000
Automotive
Automotive
Automotive
Automotive
Automotive
0.5%
0.2% TLV431TQFTA
Notes:
9. For packaging details, go to our website at https://www.diodes.com/design/support/packaging/diodes-packaging/.
10. TLV431Q has been qualified to AEC-Q100 grade 1 and is classified as “ꢃutomotive-Compliant” which supports PPꢃP documentation.
See TLV431 for commercial variants.
Marking Information
(1) SOT23
(2) SOT25
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Document number: DS36915 Rev. 3 - 2
TLV431Q
Package Outline Dimensions
Please see http://www.diodes.com/package-outlines.html for the latest version.
(1) Package Type: SOT23
All 7°
H
SOT23
GAUGE PLANE
Dim
A
B
C
D
F
G
H
Min
Max
0.51
1.40
2.50
1.03 0.915
0.60 0.535
Typ
0.40
1.30
2.40
0.25
0.37
1.20
2.30
0.89
0.45
1.78
2.80
J
K
K1
a
M
A
2.05
3.00
1.83
2.90
0.05
L
L1
J
0.013 0.10
K
K1
L
L1
M
a
0.890 1.00 0.975
0.903 1.10 1.025
C
B
0.45
0.25
0.61
0.55
0.55
0.40
0.085 0.150 0.110
0° 8° --
D
All Dimensions in mm
G
F
(2) Package Type: SOT25
A
SOT25
Dim Min Max Typ
A
B
C
D
H
J
K
L
M
N
0.35 0.50 0.38
1.50 1.70 1.60
2.70 3.00 2.80
B C
-
-
0.95
2.90 3.10 3.00
0.013 0.10 0.05
1.00 1.30 1.10
0.35 0.55 0.40
0.10 0.20 0.15
0.70 0.80 0.75
H
K
M
N
J
L
D
0°
8°
-
All Dimensions in mm
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Document number: DS36915 Rev. 3 - 2
TLV431Q
Suggested Pad Layout
Please see http://www.diodes.com/package-outlines.html for the latest version.
(1) Package Type: SOT23
Y
Dimensions Value (in mm)
C
X
X1
Y
2.0
0.8
1.35
0.9
Y1
C
Y1
2.9
X
X1
(2) Package Type: SOT25
C2
C2
Dimensions
Value
3.20
1.60
0.55
0.80
2.40
0.95
Z
G
X
Y
C1
C2
C1
G
Z
Y
X
Note:
Note:
The suggested land pattern dimensions have been provided for reference only, as actual pad layouts may vary depending on application.
These dimensions may be modified based on user equipment capability or fabrication criteria. A more robust pattern may be desired for wave soldering
and is calculated by adding 0.ꢄ mm to the ‘ꢇ’ dimension. ꢁor further information, please reference document IPC-7351A, Naming Convention for
Standard SMT Land Patterns, and for International grid details, please see document IEC, Publication 97.
For high voltage applications, the appropriate industry sector guidelines should be considered with regards to creepage and clearance distances between
device Terminals and PCB tracking.
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TLV431Q
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated 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 Diodes Incorporated. 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.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2018, Diodes Incorporated
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