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TLV431 Datasheet

Diodes Incorporated

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Datasheet

TLV431
Document number: DS32088 Rev. 6 - 2
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TLV431
A Product Line of
Diodes Incorporated
1.24V COST EFFECTIVE SHUNT REGULATOR
Description
The TLV431 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.
The TLV431 can be used as a replacement for zener diodes in many
applications requiring an improvement in zener performance.
The TLV431 is available in 3 grades with initial tolerances of 1%,
0.5%, and 0.2% for the A, B and T grades respectively.
Features
Low Voltage Operation VREF = 1.24V
Temperature range -40 to +125°C
Reference Voltage Tolerance at +25°C
0.2% TLV431T
0.5% TLV431B
1% TLV431A
Typical temperature drift
4 mV (0°C to +70°C)
6 mV (-40°C to +85°C)
11mV (-40°C to +125°C)
80µA Minimum cathode current
0.25 Typical Output Impedance
Adjustable Output Voltage VREF to 18V
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Qualified to AEC-Q100
Typical Application Circuit
3.3 V
Secondary side
regulated supply
Primary side
controller
R3
IF
R1
R2
TLV431
GND
Optocoupler
Pin Assignments
TLV431_H6 (SC70-6 [SOT363])
(Top View)
TLV431_F (SOT23)
(Top View)
TLV431_E5 (SOT25)
(Top View)
‡ Pin should be left floating or connect to anode
Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
N/C 1
CATHODE 3
N/C 2
4 REF
3 ANODE
REF 1
CATHODE 2
6 ANODE
CATHODE 1
REF 3
N/C 2
4 NC
5 NC
TLV431
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Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Rating Unit
VKA Cathode Voltage 20 V
IKA Continuous Cathode Current -20 to +20 mA
IREF Reference Input Current Range -0.05 to +3 mA
VIN Input Supply Voltage (Relative to Ground) -0.03 to +18 V
ESD Susceptibility
HBM Human Body Model 4 kV
MM Machine Model 400 V
CDM Charged Device Model 1 kV
(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.)
Parameter Rating Unit
Operating Junction Temperature -40 to +150 °C
Storage Temperature -65 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.
These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Min Max Units
VKA Cathode Voltage VREF 18 V
IKA Cathode Current 0.1 15 mA
TA Operating Ambient Temperature Range -40 +125 °C
Package Thermal Data
Package
θ
JA PDIS
TA = +25°C, TJ = +150°C
SOT23 380°C/W 330mW
SOT25 250°C/W 500mW
SC70-6
(SOT363) 380°C/W 330mW
TLV431
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Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Conditions Min Typ Max Units
VREF Reference Voltage
VKA = VREF,
TA = +25°C
TLV431A 1.228 1.24 1.252
V
TLV431B 1.234 1.24 1.246
TLV431T 1.2375 1.24 1.2425
VKA = VREF,
TA = 0 to +70°C
TLV431A 1.221 1.259
TLV431B 1.227 1.253
TLV431T 1.230 1.250
VKA = VREF,
TA = -40 to +85°C
TLV431A 1.215 1.265
TLV431B 1.224 1.259
TLV431T 1.228 1.252
VKA = VREF,
TA = -40 to +125°C
TLV431A 1.209 1.271
TLV431B 1.221 1.265
TLV431T 1.224 1.255
VREF(dev) Deviation of reference
voltage over full
temperature range VKA = VREF
TA = 0 to +70°C 4 12
mV
TA = -40 to +85°C 6 20
TA = -40 to +125°C 11 31
ΔVREF
ΔVKA
Ratio of change in
reference voltage to the
change in cathode
voltage
VKA for VREF to 6V -1.5 -2.7 mV/V
18V -1.5 -2.7
IREF Reference Input Current R1 = 10kΩ, R2 = OC 0.15 0.5 µA
IREF(dev) IREF deviation over full
temperature range R1 = 10kΩ,
R2 = OC
TA = 0 to +70°C 0.05 0.3
µA
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 = 0 to +70°C 55 80
µA
TA = -40 to +85°C 55 80
TA = -40 to +125°C 55 100
IK(OFF) Off state current VKA = 18V, VREF = 0V 0.001 0.1 µA
ZKA Dynamic output
impedance VKA = VREF, f = <1kHz
IK = 0.1 to 15mA 0.25 0.4
TLV431
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Typical Characteristics
Test Circuit for VREF Measurement
10k
O/P
75k
I
K
10mA
S1
100nF
56k
TLV431
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Typical Characteristics (cont.)
TLV431
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Typical Characteristics (cont.)
Test Circuit for Input Noise Voltage
Test Circuit for Phase Shift and Gain
Test Circuit for Reference Impedance
100µF
50
100
O/P
100
~
~
10µF
4.3k
O/P
6.8k
180
5V
IK
470µF
750
O/P
1k
3V
TLV431
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Typical Characteristics (cont.)
Test Circuit for Pulse Response
Pulse
Generator
O/P
TLV431
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Application Notes
In a conventional shunt regulator application (Figure 1), an external series resistor (R3) is connected between the supply voltage, VIN, and the
TLV431.
R3 determines the current that flows through the load (IL) and the TLV431 (IK). The TLV431 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 TLV431 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
TLV431 is less than 15mA.
R3 is determined by the supply voltage, (VIN), the load and operating current, (IL and IK), and the TLV431’s reverse breakdown voltage, VKA.
R3
V
in
V
out
V
IK
IL
R1
R2
TLV431
GND
C1
0.1µF
REF
Figure 1
KL
KAIN
3
II
VV
R+
=
where
+×=
2
1
REFKA R
R
1VV
and VKA = VOUT
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 that the voltage drop across them caused IREF affects the reference accuracy.
The most frequent application of the TLV431 is in isolated low output voltage power supplies where the regulated output is galvanically isolated
from the controller. As shown in Figure 2 the TLV431 drives current, IF, through the opto-coupler’s LED which in turn drives the isolated transistor
which is connected to the controller on the primary side of the power supply.
This completes the feedback path through the isolation barrier and ensures that a stable isolated supply is maintained.
Assuming a forward drop of 1.4V across the opto-coupler diode allows output voltages as low as 2.7V to be regulated.
Regulated SupplyRegulated Supply
To controller
To controller
R3
I
F
R1
R2
TLV431
GND
Optocoupler
+= 2R
1R
1VV
REFOUT
mA15
7.2V
3R
I
7.2V
(max)OUT
(min)F
OUT
>
Figure 2. Using the TLV431 as the Regulating Element in an Isolated PSU
TLV431
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Application Notes (cont.)
Printed Circuit Board Layout Considerations
The TLV431 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.
TLV431 in the SC70-6 (SOT363) package has the die attached to pin 2 and 5, which results in an electrical contact between pins 2, 5 and pin 6.
Therefore, pins 2 and 5 must be left floating or connected to pin 6.
Other Applications of the TLV431
R4
V
in
V
out
I
B
R1
R2
TLV431
GND
C1
0.1µF
ZXTP2039F
Q1
R3
I
SH
V
REF
+= 2R
1R
1VV REFOUT
BSH
OUTIN II
VV
3R +
=
B
BE
I
V
4R =
mA15I
h
I
B
(min)FE
SH
<
Figure 3. High Current Shunt Regulator
It may at times be required to shunt-regulate more current than the 15mA that the TLV431 is capable of.
Figure 3 shows how this can be done using transistor Q1 to amplify the TLV431’s current. Care needs to be taken that the power dissipation
and/or SOA requirements of the transistor is not exceeded.
R3
V
in
V
out
V
I
B
I
OUT
R1
R2
TLV431
GND
C1
0.1µF
REF
ZXTN25020CFH
Q1
+= 2R
1R
1VV
REFOUT
B
BEOUTIN
I
)VV(V
3R +
=
mA15I
h
I
B
(min)FE
(max)OUT
<
Figure 4. Basic Series Regulator
A very effective and simple series regulator can be implemented as shown in Figure 4 above. This may be preferable if the load requires more
current than can be provided by the TLV431 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.
TLV431
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TLV431
A Product Line of
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Application Notes (cont.)
Printed Circuit Board Layout Considerations (cont.)
R3
V
in
V
out
V
I
B
I
OUT
R1
R2
TLV431
GND
C1
0.1µF
REF
ZXTN25020CFH
Q1
V
REF
R
S
TLV431
+= 2R
1R
1VV REFOUT
B
BEOUTIN
I
)VV(V
3R +
=
mA18I
h
IB
(min)FE
(max)OUT <
(max)OUT
REF
S
I
V
R=
Figure 5. Series Regulator with Current Limit
Figure 5 adds current limit to the series regulator in Figure 4 using a second TLV431. 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
TLV431, 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.
V
in
V
out
V
R1
R2
TLV431
GND
C1
0.1µF
REF
VR1
Vin Vout
GND
AP1084
REG
V
+= 2R
1R
1VV
REFOUT
)VV(V
REFREGOUT
+
(All features of the regulator
such as short circuit protection,
thermal shutdown, etc, are
maintained.)
Figure 6. Increasing Output Voltage of a Fixed Linear Regulator
One of the useful applications of the TLV431 is in using it to improve the accuracy and/or extend the range and flexibility of fixed voltage
regulators. In the circuit in Figure 6 above both the output voltage and its accuracy are entirely determined by the TLV431, R1 and R2. However
the rest of the features of the regulator (up to 5A output current, output current limiting and thermal shutdown) are all still available.
TLV431
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Application Notes (cont.)
Printed Circuit Board Layout Considerations (cont.)
V
in
V
out
V
R1
R2
TLV431
GND
C1
0.1µF
REF
VR1
Vin Vout
GND
AP1117 or AP1084
1.2 V
R3
IB
+= 2R
1R
1VV REFOUT
)VV(V REFREGOUT +
B
REGOUTIN I
)VV(V
3R
=
mA18ImA1.0
B
(All features of the regulator
such as short circuit
protection, thermal shutdown,
etc, are maintained.)
Figure 7. Adjustable Linear Voltage Regulator
Figure 7 is similar to Figure 6 with adjustability added. Note the addition of R3. This is only required for the AP1117 due to the fact that its ground
or adjustment pin can only supply a few micro-amps of current at best. R3 is therefore needed to provide sufficient bias current for the TLV431.
Ordering Information
Tol. Part Number Package Part Mark Status Reel Size Tape Width Quanity per
Reel
1%
TLV431AE5TA SOT25 V1A Active 7”, 180mm 8mm 3000
TLV431AFTA SOT23 V1A Active 7”, 180mm 8mm 3000
TLV431AH6TA SC70-6
(SOT363) V1A Active 7”, 180mm 12mm 1000
0.5%
TLV431BE5TA SOT25 V1B Active 7”, 180mm 8mm 3000
TLV431BFTA SOT23 V1B Active 7”, 180mm 8mm 3000
TLV431BH6TA SC70-6
(SOT363) V1B Active 7”, 180mm 12mm 1000
0.2%
TLV431TFTA SOT23 V1T Active 7”, 180mm 8mm 3000
TLV431
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Package Outline Dimensions (All dimensions in mm.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.
SOT23
SOT25
SC70-6 (SOT363)
SOT23
Dim
Min
Max
Typ
A
0.37
0.51
0.40
B
1.20
1.40
1.30
C
2.30
2.50
2.40
D
0.89
1.03
0.915
F
0.45
0.60
0.535
G
1.78
2.05
1.83
H
2.80
3.00
2.90
J
0.013 0.10 0.05
K
0.903 1.10 1.00
K1
0.400
L
0.45
0.61
0.55
M
0.085
0.18
0.11
α
All Dimensions in mm
SOT25
Dim
Min
Max
Typ
A
0.35
0.50
0.38
B
1.50 1.70 1.60
C
2.70
3.00
2.80
D
0.95
H
2.90
3.10
3.00
J
0.013
0.10
0.05
K
1.00
1.30
1.10
L
0.35
0.55
0.40
M
0.10
0.20
0.15
N
0.70
0.80
0.75
α
All Dimensions in mm
SC70-6 (SOT363)
Dim
Min
Max
Typ
A
0.10
0.30
0.25
B
1.15
1.35
1.30
C
2.00
2.20
2.10
D
0.65 Typ
F
0.40
0.45
0.425
H
1.80
2.20
2.15
J
0
0.10
0.05
K
0.90
1.00
1.00
L
0.25
0.40
0.30
M
0.10
0.22
0.11
α
-
All Dimensions in mm
A
M
JL
D
F
BC
H
K
G
K1
A
M
JL
D
BC
H
KN
A
M
JL
D
B C
H
K
F
TLV431
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Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
SOT23
SOT25
SC70-6 (SOT363)
Dimensions
Value (in mm)
Z
2.9
X
0.8
Y
0.9
C
2.0
E
1.35
Dimensions
Value (in mm)
Z
3.20
G
1.60
X
0.55
Y
0.80
C1
2.40
C2
0.95
Dimensions
Value (in mm)
Z
2.5
G
1.3
X
0.42
Y
0.6
C1
1.9
C2
0.65
XE
Y
C
Z
X
Z
Y
C1
C2
C2
G
X
Z
Y
C1
C2
C2
G
TLV431
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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.
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.
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