TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
Check for Samples: TLVH431A-Q1, TLVH431B-Q1
FEATURES
1
•
•
•
Qualified for Automotive Applications
Low-Voltage Operation: Down to 1.24 V
Reference Voltage Tolerances at 25°C
– 0.5% for B Grade
– 1% for A Grade
Adjustable Output Voltage, VO = VREF to 18 V
Wide Operating Cathode Current Range:
100 μA to 70 mA
0.25-Ω Typical Output Impedance
–40°C to 125°C Specifications
•
•
•
•
DESCRIPTION/ORDERING INFORMATION
The TLVH431 devices are low-voltage 3-terminal adjustable voltage references, with thermal stability specified
over the automotive temperature range. Output voltage can be set to any value between VREF (1.24 V) and 18 V
with two external resistors (see Figure 2). These devices operate from a lower voltage (1.24 V) than the widely
used TL431 and TL1431 shunt-regulator references.
When used with an optocoupler, the TLVH431 devices are ideal voltage reference in isolated feedback circuits
for 3-V to 3.3-V switching-mode power supplies. They have a typical output impedance of 0.25 Ω. Active output
circuitry provides a very sharp turn-on characteristic, making the TLVH431 an excellent replacement for
low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.
ORDERING INFORMATION (1)
TA
–40°C to 125°C
(1)
(2)
VREF
TOLERANCE
PACKAGE (2)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
0.5%
SOT-23-5 – DBV
Reel of 3000
TLVH431BQDBVRQ1
VOPQ
0.5%
SOT-23-3 - DBZ
Reel of 3000
TLVH431BQDBZRQ1
VPIQ
1%
SOT-23-5 – DBV
Reel of 3000
TLVH431AQDBVRQ1
VOOQ
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2011, Texas Instruments Incorporated
TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
LOGIC BLOCK DIAGRAM
CATHODE
REF
+
−
VREF = 1.24 V
ANODE
EQUIVALENT SCHEMATIC
Cathode
REF
Anode
2
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TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
ABSOLUTE MAXIMUM RATINGS (1)
over operating free-air temperature range (unless otherwise noted)
VKA
Cathode voltage (2)
IK
Cathode current range
–25 mA to 80 mA
Iref
Reference current range
–0.05 mA to 3 mA
θJA
Package thermal impedance (3)
TJ
Operating virtual junction temperature
Tstg
Storage temperature range
(1)
(2)
(3)
(4)
20 V
(4)
206°C/W
150°C
–65°C to 150°C
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 or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Voltage values are with respect to the anode terminal, unless otherwise noted.
Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.
The package thermal impedance is calculated in accordance with JESD 51-7.
RECOMMENDED OPERATING CONDITIONS
MIN
MAX
UNIT
VKA
Cathode voltage
VREF
18
V
IK
Cathode current (continuous)
0.1
70
mA
TA
Operating free-air temperature
–40
125
°C
Copyright © 2008–2011, Texas Instruments Incorporated
Product Folder Link(s): TLVH431A-Q1 TLVH431B-Q1
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TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
TLVH431A ELECTRICAL CHARACTERISTICS
at 25°C free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
TA = 25°C
1.228
1.24
1.252
TA = full range (1)
(see Figure 1)
1.209
VREF
Reference voltage
VKA = VREF, IK = 10 mA
VREF(dev)
VREF deviation over full temperature
range (1) (2)
VKA = VREF, IK = 10 mA (see Figure 1)
DVREF
DVKA
Ratio of VREF change to cathode
voltage change
VK = VREF to 18 V, IK = 10 mA (see Figure 2)
Iref
Reference terminal current
Iref(dev)
1.271
UNIT
V
11
31
–1.5
–2.7
mV/V
IK = 10 mA, R1 = 10 kΩ, R2 = open (see Figure 2)
0.1
0.5
μA
Iref deviation over full temperature
range (1) (2)
IK = 10 mA, R1 = 10 kΩ, R2 = open (see Figure 2)
0.15
0.5
μA
IK(min)
Minimum cathode current for
regulation
VKA = VREF (see Figure 1)
60
100
μA
IK(off)
Off-state cathode current
VREF = 0, VKA = 18 V (see Figure 3)
0.02
0.1
μA
VKA = VREF, f ≤ 1 kHz, IK = 0.1 mA to 70 mA
(see Figure 1)
0.25
0.4
Ω
|zKA|
(1)
(2)
Dynamic impedance
Full temperature range is –40°C to 125°C.
The deviation parameters VREF(dev) and Iref(dev) are defined as the differences between the maximum and minimum values obtained over
the rated temperature range. The average full-range temperature coefficient of the reference input voltage, αVREF, is defined as:
VREF(dev)
10 6
VREF (TA+25 oC)
ppm
ŤaVREFŤ o
+
DTA
C
ǒ Ǔ
(3)
(3)
mV
ǒ
Ǔ
where ΔTA is the rated operating free-air temperature range of the device.
αVREF can be positive or negative, depending on whether minimum VREF or maximum VREF, respectively, occurs at the lower
temperature.
The dynamic impedance is defined as:
Ťz Ť + ∆VKA
KA
∆I K
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is defined as:
Ťz Ť + ∆V [ Ťz Ť
1 ) R1
KA
KA
∆I
R2
ǒ
4
Ǔ
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TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
TLVH431B ELECTRICAL CHARACTERISTICS
at 25°C free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
TA = 25°C
1.234
1.24
1.246
TA = full range (1)
(see Figure 1)
1.221
VREF
Reference voltage
VKA = VREF, IK = 10 mA
VREF(dev)
VREF deviation over full temperature
range (1) (2)
VKA = VREF, IK = 10 mA (see Figure 1)
DVREF
DVKA
Ratio of VREF change to cathode
voltage change
IK = 10 mA, VK = VREF to 18 V (see Figure 2)
Iref
Reference terminal current
Iref(dev)
1.265
UNIT
V
11
31
–1.5
–2.7
mV/V
IK = 10 mA, R1 = 10 kΩ, R2 = open (see Figure 2)
0.1
0.5
μA
Iref deviation over full temperature
range (1) (2)
IK = 10 mA, R1 = 10 kΩ, R2 = open (see Figure 2)
0.15
0.5
μA
IK(min)
Minimum cathode current for
regulation
VKA = VREF (see Figure 1)
60
100
μA
IK(off)
Off-state cathode current
VREF = 0, VKA = 18 V (see Figure 3)
0.02
0.1
μA
VKA = VREF, f ≤ 1 kHz, IK = 0.1 mA to 70 mA
(see Figure 1)
0.25
0.4
Ω
|zKA|
(1)
(2)
Dynamic impedance
Full temperature range is –40°C to 125°C.
The deviation parameters VREF(dev) and Iref(dev) are defined as the differences between the maximum and minimum values obtained over
the rated temperature range. The average full-range temperature coefficient of the reference input voltage, αVREF, is defined as:
VREF(dev)
10 6
VREF (TA+25 oC)
ppm
ŤaVREFŤ o
+
DTA
C
ǒ Ǔ
(3)
(3)
mV
ǒ
Ǔ
where ΔTA is the rated operating free-air temperature range of the device.
αVREF can be positive or negative, depending on whether minimum VREF or maximum VREF, respectively, occurs at the lower
temperature.
The dynamic impedance is defined as:
Ťz Ť + ∆VKA
KA
∆I K
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is defined as:
Ťz Ť + ∆V [ Ťz Ť
1 ) R1
KA
KA
∆I
R2
ǒ
Ǔ
Copyright © 2008–2011, Texas Instruments Incorporated
Product Folder Link(s): TLVH431A-Q1 TLVH431B-Q1
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TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
PARAMETER MEASUREMENT INFORMATION
Operation of the device at any conditions beyond those indicated under recommended operating conditions is
not implied.
Input
VO
IK
VREF
Figure 1. Test Circuit for VKA = VREF, VO = VKA = VREF
Input
VO
IK
R1
R2
Iref
VREF
Figure 2. Test Circuit for VKA > VREF, VO = VKA = VREF × (1 + R1/R2) + Iref × R1
Input
VO
IK(off)
Figure 3. Test Circuit for IK(off)
6
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TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
PARAMETER MEASUREMENT INFORMATION (continued)
REFERENCE VOLTAGE
vs
JUNCTION TEMPERATURE
1.254
IK = 10 mA
V ref − Reference Voltage − V
1.252
1.250
1.248
1.246
1.244
1.242
1.240
1.238
−50
−25
0
25
50
75
100
125
150
TJ − Junction Temperature − °C
Figure 4.
REFERENCE INPUT CURRENT
vs
JUNCTION TEMPERATURE
250
230
210
IK = 10 mA
R1 = 10 kΩ
R2 = Open
190
170
150
130
110
90
70
50
−50
−25
0
25
50
75
100
125
150
Figure 5.
Copyright © 2008–2011, Texas Instruments Incorporated
Product Folder Link(s): TLVH431A-Q1 TLVH431B-Q1
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TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
PARAMETER MEASUREMENT INFORMATION (continued)
CATHODE CURRENT
vs
CATHODE VOLTAGE
70
VKA = VREF
TA = 25°C
I K − Cathode Current − mA
10
5
0
−5
−10
−15
−1
−0.5
0
0.5
1
VKA − Cathode Voltage − V
1.5
Figure 6.
CATHODE CURRENT
vs
CATHODE VOLTAGE
250
200
VKA = VREF
TA = 25°C
I K − Cathode Current − µ A
150
100
50
0
−50
−100
−150
−200
−250
−1
−0.5
0
0.5
1
VKA − Cathode Voltage − V
1.5
Figure 7.
8
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TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
PARAMETER MEASUREMENT INFORMATION (continued)
OFF-STATE CATHODE CURRENT
vs
JUNCTION TEMPERATURE
IK(off) − Off-State Cathode Current − nA
4000
3500
VKA = 5 V
VREF = 0
3000
2500
2000
1500
1000
500
0
−50
−25
0
25
50
75
100
125
150
TJ − Junction Temperature − °C
Figure 8.
RATIO OF DELTA REFERENCE VOLTAGE
TO DELTA CATHODE VOLTAGE
vs
JUNCTION TEMPERATURE
∆V ref/ ∆V KA − Ratio of Delta Reference Voltage
to Delta Cathode Voltage − mV/V
0
0.0
−0.1
IK = 10 mA
∆VKA = VREF to 18 V
−0.2
−0.3
−0.4
−0.5
−0.6
−0.7
−0.8
−0.9
−1
−1.0
−50
−25
0
25
50
75
100
125
150
TJ − Junction Temperature − °C
Figure 9.
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TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
PARAMETER MEASUREMENT INFORMATION (continued)
PERCENTAGE CHANGE IN VREF
vs
OPERATING LIFE AT 55°C
0.025
IK = 1 mA
V ref− %
Percentage Change in Vref
0
% Change (avg)
− 0.025
% Change (3δ)
− 0.05
− 0.075
− 0.1
% Change (−3δ)
− 0.125
0
10
20
30
40
50
60
Operating Life at 55°C − kh(1)
(1) Extrapolated from life-test data taken at 125°C; the activation energy
assumed is 0.7 eV.
Figure 10.
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREQUENCY
3V
Vn − Equivalent Input Noise Voltage − nV/ Hz
350
VKA = VREF
IK = 1 mA
TA = 25°C
1 kΩ
300
470 µF
+
750 Ω
2200 µF
+
250
820 Ω
TLVH431
TLE2027
+
_
TP
160 kΩ
160 Ω
200
150
10
TEST CIRCUIT FOR EQUIVALENT INPUT NOISE VOLTAGE
100
1k
10 k
f – Frequency – Hz
100 k
Figure 11.
10
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SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
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PARAMETER MEASUREMENT INFORMATION (continued)
EQUIVALENT INPUT NOISE VOLTAGE
OVER A 10-S PERIOD
Vn − Equivalent Input Noise Voltage − µ V
10
f = 0.1 Hz to 10 Hz
IK = 1 mA
TA = 25°C
8
6
4
2
0
−2
−4
−6
−8
−10
0
2
4
8
6
10
t − Time − s
3V
1 kΩ
470 µF
+
750 Ω
0.47 µF
2200 µF
+
820 Ω
TLVH431
TLE2027
10 kΩ
+
_
160 kΩ
10 kΩ
1 µF
TLE2027
+
_
2.2 µF
+
TP
CRO 1 MΩ
33 kΩ
16 Ω
0.1 µF
33 kΩ
TEST CIRCUIT FOR 0.1-Hz TO 10-Hz EQUIVALENT NOISE VOLTAGE
Figure 12.
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TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
PARAMETER MEASUREMENT INFORMATION (continued)
0°
80
IK = 10 mA
TA = 25°C
70
36°
60
72°
50
108°
40
144°
30
180°
Phase Shift
A V − Small-Signal Voltage Gain/Phase Margin − dB
SMALL-SIGNAL VOLTAGE GAIN
/PHASE MARGIN
vs
FREQUENCY
Output
IK
6.8 kΩ
180 Ω
10 µF
5V
4.3 kΩ
20
10
GND
0
−10
−20
100
TEST CIRCUIT FOR VOLTAGE GAIN
AND PHASE MARGIN
1k
10 k
100 k
1M
f − Frequency − Hz
Figure 13.
REFERENCE IMPEDANCE
vs
FREQUENCY
100
|z ka| − Reference Impedance − Ω
IK = 0.1 mA to 70 mA
TA = 25°C
100 Ω
Output
10
IK
100 Ω
1
+
−
GND
0.1
TEST CIRCUIT FOR REFERENCE IMPEDANCE
0.01
1k
10 k
100 k
1M
10 M
f − Frequency − Hz
Figure 14.
12
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TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
PARAMETER MEASUREMENT INFORMATION (continued)
PULSE RESPONSE 1
3.5
3
Input and Output Voltage − V
R = 18 kΩ
TA = 25°C
Input
18 kΩ
Output
2.5
Ik
2
1.5
Pulse
Generator
f = 100 kHz
Output
50 Ω
1
GND
0.5
0
TEST CIRCUIT FOR PULSE RESPONSE 1
−0.5
0
1
2
3
4
5
6
7
8
t − Time − µs
Figure 15.
PULSE RESPONSE 2
3.5
3
Input and Output Voltage − V
R = 1.8 kΩ
TA = 25°C
Input
1.8 kΩ
Output
2.5
IK
2
1.5
Pulse
Generator
f = 100 kHz
Output
50 Ω
1
GND
0.5
0
TEST CIRCUIT FOR PULSE RESPONSE 2
−0.5
0
1
2
3
4
5
6
7
8
t − Time − µs
Figure 16.
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Product Folder Link(s): TLVH431A-Q1 TLVH431B-Q1
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TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
PARAMETER MEASUREMENT INFORMATION (continued)
30 kW
IK
50 W
100 µF
I2
CL
I1
Figure 17. Phase Margin Test Circuit
IK
Figure 18.
14
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SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
PARAMETER MEASUREMENT INFORMATION (continued)
IK
Figure 19.
IK
Figure 20.
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TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011
www.ti.com
APPLICATION INFORMATION
∼
VI
120 V
−
P
+
∼
VO
3.3 V
P
P
Gate Drive
VCC
Controller
VFB
TLVH431
Current
Sense
GND
P
P
P
P
Figure 21. Flyback With Isolation Using TLVH431 as Voltage Reference and Error Amplifier
Figure 21 shows the TLVH431 used in a 3.3-V isolated flyback supply. Output voltage VO can be as low as
reference voltage VREF (1.24 V). The output of the regulator plus the forward voltage drop of the optocoupler LED
(1.24 + 1.4 = 2.64 V) determine the minimum voltage that can be regulated in an isolated supply configuration.
Regulated voltage as low as 2.7 Vdc is possible in the topology shown in Figure 21.
16
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PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
TLVH431AQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
VOOQ
TLVH431BQDBVRQ1
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
VOPQ
TLVH431BQDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
VPIQ
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
