TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DLow-Voltage Operation ...V
REF = 1.24 V
DAdjustable Output Voltage, VO = VREF to 6 V
DReference Voltage Tolerances at 255C
− 0.5% for TLV431B
− 1% for TLV431A
− 1.5% for TLV431
DTypical Temperature Drift
− 4 mV (05C to 705C)
− 6 mV (–405C to 855C)
− 11 mV (–405C to 1255C)
DLow Operational Cathode Current . . .
80 µA Typ
D0.25-Ω Typical Output Impedance
DUltra-Small SC-70 Package Offers 40%
Smaller Footprint Than SOT-23-3
DSee TLVH431 and TLVH432 for
− Wider VKA (1.24 V to 18 V) and IK (80 mA)
− Additional SOT-89 Package
− Multiple Pinouts for SOT-23-3 and SOT-89
Packages
REF
ANODE
CATHODE
LP (TO-92/TO-226) PACKAGE
(TOP VIEW)
NC − No internal connection
* For TLV431, TLV431A: NC − No internal connection
* For TLV431B: Pin 2 is attached to Substrate and
must be connected to ANODE or
left open.
DBV (SOT-23-5) PACKAGE
(TOP VIEW)
1
2
3
5
4
NC
*
CATHODE
ANODE
REF
DBZ (SOT-23-3) PACKAGE
(TOP VIEW)
1
2
3
REF
CATHODE
ANODE
D (SOIC) PACKAGE
(TOP VIEW)
1
2
3
4
8
7
6
5
REF
ANODE
ANODE
NC
CATHODE
ANODE
ANODE
NC
DCK (SC-70) PACKAGE
(TOP VIEW)
1
2
3
6
5
4
CATHODE
NC
REF
ANODE
NC
NC
NC − No internal connection
PK (SOT-89) PACKAGE
(TOP VIEW)
1
3
2
REF
CATHODE
ANODEANODE
description/ordering information
The TLV431 is a low-voltage 3-terminal adjustable voltage reference with specified thermal stability over
applicable industrial and commercial temperature ranges. Output voltage can be set to any value between VREF
(1.24 V) and 6 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 TLV431 is an ideal voltage reference in isolated feedback circuits for 3-V
to 3.3-V switching-mode power supplies. These devices have a typical output impedance of 0.25 Ω. Active
output circuitry provides a very sharp turn-on characteristic, making them excellent replacements for
low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.
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.
Copyright 2007, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ORDERING INFORMATION
TJ
255C VREF
TOLERANCE PACKAGE†ORDERABLE
PART NUMBER
TOP-SIDE
MARKING‡
SC 70 (DCK)
Reel of 3000 TLV431BCDCKR
YE
SC-70 (DCK) Reel of 250 TLV431BCDCKT YE_
SOT 23 5 (DBV)
Reel of 3000 TLV431BCDBVR
Y3G
SOT-23-5 (DBV) Reel of 250 TLV431BCDBVT Y3G_
0.5%
SOT 23 3 (DBZ)
Reel of 3000 TLV431BCDBZR
Y3G
SOT-23-3 (DBZ) Reel of 250 TLV431BCDBZT Y3G_
SOT-89 (PK) Reel of 1000 TLV431BCPK VE
TO 92 (LP)
Bulk of 1000 TLV431BCLP
TV431B
TO-92 (LP) Reel of 2000 TLV431BCLPR TV431B
0°C to 70°C
SOT 23 5 (DBV)
Reel of 3000 TLV431ACDBVR
YAC
SOT-23-5 (DBV) Reel of 250 TLV431ACDBVT YAC_
1% SOT-23-3 (DBZ) Reel of 3000 TLV431ACDBZR YAC_
1%
TO 92 (LP)
Bulk of 1000 TLV431ACLP
V431AC
TO-92 (LP) Reel of 2000 TLV431ACLPR V431AC
SOT 23 5 (DBV)
Reel of 3000 TLV431CDBVR
Y3C
SOT-23-5 (DBV) Reel of 250 TLV431CDBVT Y3C_
1.5% SOT-23-3 (DBZ) Reel of 3000 TLV431CDBZR Y3C_
1.5%
TO 92 (LP)
Bulk of 1000 TLV431CLP
V431C
TO-92 (LP) Reel of 2000 TLV431CLPR V431C
†Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
‡DBV/DBZ/DCK: The actual top-side marking has one additional character that designates the wafer fab/assembly site.
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ORDERING INFORMATION (continued)
TJ
255C VREF
TOLERANCE PACKAGE†ORDERABLE
PART NUMBER
TOP-SIDE
MARKING‡
SC 70 (DCK)
Reel of 3000 TLV431BIDCKR
YF
SC-70 (DCK) Reel of 250 TLV431BIDCKT YF_
SOT 23 5 (DBV)
Reel of 3000 TLV431BIDBVR
Y3F
05%
SOT-23-5 (DBV) Reel of 250 TLV431BIDBVT Y3F_
0.5%
SOT 23 3 (DBZ)
Reel of 3000 TLV431BIDBZR
Y3F
SOT-23-3 (DBZ) Reel of 250 TLV431BIDBZT Y3F_
TO 92 (LP)
Bulk of 1000 TLV431BILP
TY431B
TO-92 (LP) Reel of 2000 TLV431BILPR TY431B
SOIC (D)
Tube of 75 TLV431AID
TY431A
SOIC (D) Reel of 2500 TLV431AIDR TY431A
SOT 23 5 (DBV)
Reel of 3000 TLV431AIDBVR
YAI
−40°C to 85°CSOT-23-5 (DBV) Reel of 250 TLV431AIDBVT YAI_
1% SOT-23-3 (DBZ) Reel of 3000 TLV431AIDBZR YAI_
1%
SOT-89 (PK) Reel of 1000 TLV431BIPK VF
Bulk of 1000 TLV431AILP
TO-92 (LP) Ammo of 2000 TLV431AILPM V431AI
TO 92
(LP)
Reel of 2000 TLV431AILPR
V431AI
SOT 23 5 (DBV)
Reel of 3000 TLV431IDBVR
Y3I
SOT-23-5 (DBV) Reel of 250 TLV431IDBVT Y3I_
1.5% SOT-23-3 (DBZ) Reel of 3000 TLV431IDBZR Y3I_
1.5%
TO 92 (LP)
Bulk of 1000 TLV431ILP
V431I
TO-92 (LP) Reel of 2000 TLV431ILPR V431I
SC 70 (DCK)
Reel of 3000 TLV431BQDCKR
YG
SC-70 (DCK) Reel of 250 TLV431BQDCKT YG_
SOT 23 5 (DBV)
Reel of 3000 TLV431BQDBVR
Y3H
SOT-23-5 (DBV) Reel of 250 TLV431BQDBVT Y3H_
0.5%
SOT 23 3 (DBZ)
Reel of 3000 TLV431BQDBZR
Y3H
−40°C to 125°C
0.5%
SOT-23-3 (DBZ) Reel of 250 TLV431BQDBZT Y3H_
40 C
to
125 C
SOT-89 (PK) Reel of 1000 TLV431BQPK V6
TO 92 (LP)
Bulk of 1000 TLV431BQLP
TQ431B
TO-92 (LP) Reel of 2000 TLV431BQLPR TQ431B
1% SOT-89 (PK) Reel of 1000 TLV431AQPK VA
1.5% SOT-89 (PK) Reel of 1000 TLV431QPK VB
†Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
‡DBV/DBZ/DCK: The actual top-side marking has one additional character that designates the assembly/test site.
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic block diagram
CATHODE
REF
ANODE
VREF = 1.24 V
−
+
equivalent schematic
REF
CATHODE
ANODE
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Cathode voltage, VKA (see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous cathode current range, IK −20 mA to 20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference current range, Iref −0.05 mA to 3 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θJA (see Notes 2 and 3): D package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .
DBV package 206°C/W. . . . . . . . . . . . . . . . . . . . . . . .
DBZ package 206°C/W. . . . . . . . . . . . . . . . . . . . . . . . .
DCK package 252°C/W. . . . . . . . . . . . . . . . . . . . . . . .
LP package 140°C/W. . . . . . . . . . . . . . . . . . . . . . . . . .
PK package 52°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating virtual junction temperature 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg −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.
NOTES: 1. Voltage values are with respect to the anode terminal, unless otherwise noted.
2. 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.
3. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions
MIN MAX UNIT
VKA Cathode voltage VREF 6 V
IKCathode current 0.1 15 mA
TLV431_C 0 70
TAOperating free-air temperature range TLV431_I −40 85 °C
A
pg p g
TLV431_Q −40 125
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TLV431 electrical characteristics at 25°C free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
TLV431
UNIT
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
TA = 25°C 1.222 1.24 1.258
Reference voltage
VKA = VREF
,
TA
=
full range
TLV431C 1.21 1.27
V
VREF Reference voltage
VKA
=
VREF
,
IK = 10 mA
T
A =
full
range
(see Note 4 and TLV431I 1.202 1.278 V
(see
Note
4
and
Figure 1) TLV431Q 1.194 1.286
V d i ti f ll
V V I 10 A
TLV431C 4 12
VREF
dev
VREF deviation over full
temperature range (see Note 4)
VKA = VREF
, IK = 10 mA
(see Note 4 and Figure 1)
TLV431I 6 20 mV
t
empera
t
ure range
(
see
N
o
t
e
4)
(
see
N
o
t
e
4
an
d
Fi
gure
1)
TLV431Q 11 31
mV
∆VREF
∆VKA
Ratio of VREF change in cathode
voltage change VKA = VREF to 6 V, IK = 10 mA (see Figure 2) −1.5 −2.7 mV/V
Iref Reference terminal current IK = 10 mA, R1 = 10 kΩ, R2 = open (see Figure 2) 0.15 0.5 µA
TLV431C
005
03
I d i ti f ll
I10 A R1 10 kΩR2
TLV431C 0.05 0.3
Iref
dev
Iref deviation over full
temperature range (see Note 4)
IK = 10 mA, R1 = 10 kΩ, R2 = open
(see Note 4 and Figure 2)
TLV431I 0.1 0.4 µA
t
empera
t
ure range
(
see
N
o
t
e
4)
(
see
N
o
t
e
4
an
d
Fi
gure
2)
TLV431Q 0.15 0.5
µA
Minimum cathode current for
V V (see Figure 1)
TLV431C/I 55 80
A
IK(min)
Minimum
cathode
current
for
regulation VKA = VREF (see Figure 1) TLV431Q 55 100 µA
IK(off) Off-state cathode current VREF = 0, VKA = 6 V (see Figure 3) 0.001 0.1 µA
|zKA|Dynamic impedance
(see Note 5)
VKA = VREF
, f ≤ 1 kHz,
IK = 0.1 mA to 15 mA (see Figure 1) 0.25 0.4 Ω
NOTES: 4. Full temperature ranges are − 40°C to 125°C for TLV431Q, − 40°C to 85°C for TLV431I, and 0°C to 70°C for TLV431C.
5. 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:
ŤαVREFŤǒppm
°CǓ+ǒVREF(dev)
VREF (TA+25°C)Ǔ 106
∆TA
where ∆TA 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.
6. The dynamic impedance is defined as ŤzkaŤ+
∆VKA
∆IK
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is defined
as: ŤzkaŤȀ+∆V
∆I[ŤzkaŤ ǒ1)R1
R2Ǔ
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TLV431A electrical characteristics at 25°C free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
TLV431A
UNIT
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
TA = 25°C 1.228 1.24 1.252
Reference voltage
VKA = VREF
,
TA
=
full range
TLV431AC 1.221 1.259
V
VREF Reference voltage
VKA
=
VREF
,
IK = 10 mA
T
A =
full
range
(see Note 3 and TLV431AI 1.215 1.265 V
(see
Note
3
and
Figure 1) TLV431AQ 1.209 1.271
V d i ti f ll
V V I 10 A
TLV431AC 4 12
VREF
dev
VREF deviation over full
temperature range (see Note 4)
VKA = VREF
, IK = 10 mA
(see Note 3 and Figure 1)
TLV431AI 6 20 mV
t
empera
t
ure range
(
see
N
o
t
e
4)
(
see
N
o
t
e
3
an
d
Fi
gure
1)
TLV431AQ 11 31
mV
∆VREF
∆VKA
Ratio of VREF change in cathode
voltage change VKA = VREF to 6 V, IK = 10 mA (see Figure 2) −1.5 −2.7 mV/V
Iref Reference terminal current IK = 10 mA, R1 = 10 kΩ, R2 = open (see Figure 2) 0.15 0.5 µA
I d i ti f ll
I10 A R1 10 kΩR2
TLV431AC 0.05 0.3
Iref
dev
Iref deviation over full
temperature range (see Note 4)
IK = 10 mA, R1 = 10 kΩ, R2 = open
(see Note 3 and Figure 2)
TLV431AI 0.1 0.4 µA
t
empera
t
ure range
(
see
N
o
t
e
4)
(
see
N
o
t
e
3
an
d
Fi
gure
2)
TLV431AQ 0.15 0.5
µA
Minimum cathode current for
V V (see Figure 1)
TLV431AC/AI 55 80
A
IK(min)
Minimum
cathode
current
for
regulation VKA = VREF (see Figure 1) TLV431AQ 55 100 µA
IK(off) Off-state cathode current VREF = 0, VKA = 6 V (see Figure 3) 0.001 0.1 µA
|zKA|Dynamic impedance
(see Note 5)
VKA = VREF
, f ≤ 1 kHz,
IK = 0.1 mA to 15 mA (see Figure 1) 0.25 0.4 Ω
NOTES: 3. Full temperature ranges are − 40°C to 125°C for TLV431AQ, − 40°C to 85°C for TLV431AI, and 0°C to 70°C for TLV431AC.
4. 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:
ŤαVREFŤǒppm
°CǓ+ǒVREF(dev)
VREF (TA+25°C)Ǔ 106
∆TA
where ∆TA 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.
5. The dynamic impedance is defined as ŤzkaŤ+
∆VKA
∆IK
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is defined
as: ŤzkaŤȀ+∆V
∆I[ŤzkaŤ ǒ1)R1
R2Ǔ
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
8POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TLV431B electrical characteristics at 25°C free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
TLV431B
UNIT
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
TA = 25°C 1.234 1.24 1.246
Reference voltage
VKA = VREF
,
TA
=
full range
TLV431BC 1.227 1.253
V
VREF Reference voltage
VKA
=
VREF
,
IK = 10 mA
T
A =
full
range
(see Note 3 and TLV431BI 1.224 1.259 V
(see
Note
3
and
Figure 1) TLV431BQ 1.221 1.265
V d i ti f ll
V V I 10 A
TLV431BC 4 12
VREF
dev
VREF deviation over full
temperature range (see Note 4)
VKA = VREF
, IK = 10 mA
(see Note 3 and Figure 1)
TLV431BI 6 20 mV
t
empera
t
ure range
(
see
N
o
t
e
4)
(
see
N
o
t
e
3
an
d
Fi
gure
1)
TLV431BQ 11 31
mV
∆VREF
∆VKA
Ratio of VREF change in cathode
voltage change VKA = VREF to 6 V, IK = 10 mA (see Figure 2) −1.5 −2.7 mV/V
Iref Reference terminal current IK = 10 mA, R1 = 10 kΩ, R2 = open (see Figure 2) 0.1 0.5 µA
I d i ti f ll
I10 A R1 10 kΩR2
TLV431BC 0.05 0.3
Iref
dev
Iref deviation over full
temperature range (see Note 4)
IK = 10 mA, R1 = 10 kΩ, R2 = open
(see Note 3 and Figure 2)
TLV431BI 0.1 0.4 µA
t
empera
t
ure range
(
see
N
o
t
e
4)
(
see
N
o
t
e
3
an
d
Fi
gure
2)
TLV431BQ 0.15 0.5
µA
IK(min)
Minimum cathode current for
regulation VKA = VREF (see Figure 1) 55 100 µA
IK(off) Off-state cathode current VREF = 0, VKA = 6 V (see Figure 3) 0.001 0.1 µA
|zKA|Dynamic impedance
(see Note 5)
VKA = VREF
, f ≤ 1 kHz,
IK = 0.1 mA to 15 mA (see Figure 1) 0.25 0.4 Ω
NOTES: 3. Full temperature ranges are − 40°C to 125°C for TLV431BQ, − 40°C to 85°C for TLV431BI, and 0°C to 70°C for TLV431BC.
4. 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:
ŤαVREFŤǒppm
°CǓ+ǒVREF(dev)
VREF (TA+25°C)Ǔ 106
∆TA
where ∆TA 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.
5. The dynamic impedance is defined as ŤzkaŤ+
∆VKA
∆IK
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is defined
as: ŤzkaŤȀ+∆V
∆I[ŤzkaŤ ǒ1)R1
R2Ǔ
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VREF
Input VO
IK
Figure 1. Test Circuit for VKA = VREF
,
VO = VKA = VREF
Iref
IK
VO
Input
VREF
R1
R2
Figure 2. Test Circuit for VKA > VREF
,
VO = VKA = VREF ×(1 + R1/R2) + Iref ×R1
IK(off)
VO
Input
Figure 3. Test Circuit for IK(off)
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION†
Figure 4
1.246
1.242
1.240
1.238
− Reference Voltage − V
1.250
1.252
REFERENCE VOLTAGE
vs
JUNCTION TEMPERATURE
1.254
1.248
1.244
−50 −25 0 25 50 75 100 125 150
IK = 10 mA
Vref
TJ − Junction Temperature − °C
50
70
90
110
130
150
170
190
210
230
250
−50 −25 0 25 50 75 100 125 150
IK = 10 mA
R1 = 10 kΩ
R2 = Open
− Reference Input Current − nA
Iref
TJ − Junction Temperature − °C
Figure 5
150
100
50
− Reference Input Current − nA
200
REFERENCE INPUT CURRENT
vs
JUNCTION TEMPERATURE
(for TLV431 and TLV431A)
250
−50 −25 0 25 50 75 100 125 150
Iref
TJ − Junction Temperature − °C
IK = 10 mA
R1 = 10 kΩ
R2 = Open
REFERENCE INPUT CURRENT
vs
JUNCTION TEMPERATURE
(for TLV431B)
Figure 5A Figure 5B
†Operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION†
Figure 6
− Cathode Current − mA
CATHODE CURRENT
vs
CATHODE VOLTAGE
15
10
5
0
−5
−10
−15
−1 −0.5 0 0.5 1 1.5
IK
VKA = VREF
TA = 25°C
VKA − Cathode Voltage − V
Figure 7
− Cathode Current −
CATHODE CURRENT
vs
CATHODE VOLTAGE
250
200
150
100
50
0
−200
−250
−1 −0.5 0 0.5 1 1.5
IKAµ
VKA − Cathode Voltage − V
−50
−100
−150
VKA = VREF
TA = 25°C
Figure 8
20
10
0
− Off-State Cathode Current − nA
30
OFF-STATE CATHODE CURRENT
vs
JUNCTION TEMPERATURE
(for TLV431 and TLV431A)
40
−50 −25 0 25 50 75 100 125
IK(off)
TJ − Junction Temperature − °C
VKA = 5 V
VREF = 0
150
OFF-STATE CATHODE CURRENT
vs
JUNCTION TEMPERATURE
(for TLV431B)
0
500
1000
1500
2000
2500
3000
−50 −25 0 25 50 75 100 125 150
VKA = 6 V
VREF = 0
Figure 8BFigure 8A
TJ − Junction Temperature − °C
− Off-State Cathode Current − nAIK(off)
†Operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
12 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION†
− Ratio of Delta Reference Voltage
RATIO OF DELTA REFERENCE VOLTAGE
TO DELTA CATHODE VOLTAGE
vs
JUNCTION TEMPERATURE
(for TLV431 and TLV431A)
0
−0.1
−0.2
−0.3
−0.4
−0.5
−0.6
−0.7
−0.8
to Delta Cathode Voltage − mV/V
Vref/
∆VKA
∆
−50 −25 0 25 50 75 100 125 150
TJ − Junction Temperature − °C
Figure 9
IK = 10 mA
∆VKA = VREF to 6 V
RATIO OF DELTA REFERENCE VOLTAGE
TO DELTA CATHODE VOLTAGE
vs
JUNCTION TEMPERATURE
(for TLV431B)
−1.0
−0.9
−0.8
−0.7
−0.6
−0.5
−0.4
−0.3
−0.2
−0.1
0.0
−50 −25 0 25 50 75 100 125 150
IK = 10 mA
∆VKA = VREF to 6 V
Figure 9BFigure 9A
−1
0
TJ − Junction Temperature − °C
− Ratio of Delta Reference Voltage
to Delta Cathode Voltage − mV/V
Vref/
∆VKA
∆
−0.025
−0.075
−0.1
−0.125
Percentage Change in Vref − %
0.025
PERCENTAGE CHANGE IN VREF
vs
OPERATING LIFE AT 55°C
0
−0.05
0102030405060
IK = 1 mA
Vref
Operating Life at 55°C − kh‡
% Change (3δ)
% Change (−3δ)
% Change (avg)
‡Extrapolated from life-test data taken at 125°C; the activation energy assumed is 0.7 eV.
Figure 10
†Operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
200
150
10 100 1k
− Equivalent Input Noise Voltage −
f − Frequency − Hz
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREQUENCY
350
10k 100k
300
250
VnnV/ Hz
VKA = VREF
IK = 1 mA
TA = 25°C
_
+
820 Ω
+
2200 µF
750 Ω
1 kΩ
470 µF
3 V
TLV431
or
TLV431A
or
TLV431B
TP
160 kΩ
160 Ω
TLE2027
TEST CIRCUIT FOR EQUIVALENT INPUT NOISE VOLTAGE
+
Figure 11
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
14 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
0246
t − Time − s
EQUIVALENT INPUT NOISE VOLTAGE
OVER A 10-s PERIOD
810
10
8
6
4
2
0
−2
−4
−6
−8
−10
f = 0.1 Hz to 10 Hz
IK = 1 mA
TA = 25°C
− Equivalent Input Noise Voltage −
VnVµ
_
+
1 µF
750 Ω
1 kΩ
470 µF
3 V
TLV431
or
TLV431A
or
TLV431B
33 kΩ
TLE2027
TEST CIRCUIT FOR 0.1-Hz TO 10-Hz EQUIVALENT NOISE VOLTAGE
+
33 kΩ
10 kΩ
_
+
16 Ω0.1 µF
160 kΩ
820 Ω
+
2200 µF
TP
2.2 µF
CRO 1 MΩ
TLE2027
0.47 µF
10 kΩ
+
Figure 12
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
15
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
SMALL-SIGNAL VOLTAGE GAIN/PHASE MARGIN
vs
FREQUENCY
10 µF
GND
Output
180 Ω
IK
6.8 kΩ
1k 10k 100k 1M100
− Small-Signal Voltage Gain/Phase Margin − dB
f − Frequency − Hz
AV
TEST CIRCUIT FOR VOLTAGE GAIN
AND PHASE MARGIN
80
70
60
50
40
30
20
10
0
−10
0°
36°
72°
108°
144°
180°
Phase Shift
4.3 kΩ
5 V
IK = 10 mA
TA = 25°C
−20
Figure 13
100 Ω
100 Ω
GND
Output
IK
0.1
1k 10k 100k 1M 10M
− Reference Impedance −
1
f − Frequency − Hz
REFERENCE IMPEDANCE
vs
FREQUENCY
10
100
ka
|z |Ω
IK = 0.1 mA to 15 mA
TA = 25°C
TEST CIRCUIT FOR REFERENCE IMPEDANCE
0.01
−
+
Figure 14
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
16 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
Input and Output Voltage − V
Output
R = 18 kΩ
TA = 25°C
18 kΩ
50 Ω
GND
Output
Pulse
Generator
f = 100 kHz
TEST CIRCUIT FOR PULSE RESPONSE 1
01234
PULSE RESPONSE 1
5678
3.5
3
2.5
2
1.5
1
0.5
0
−0.5
t − Time − µs
Input
Ik
Figure 15
Input and Output Voltage − V
Output
R = 1.8 kΩ
TA = 25°C
1.8 kΩ
50 Ω
GND
Output
Pulse
Generator
f = 100 kHz
TEST CIRCUIT FOR PULSE RESPONSE 2
01234
PULSE RESPONSE 2
5678
3.5
3
2.5
2
1.5
1
0.5
0
−0.5
t − Time − µs
Input
IK
Figure 16
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION†
9
6
0
15
0.001 0.01 0.1 1 10
− Cathode Current − mA
12
STABILITY BOUNDARY CONDITION‡
(for TLV431 and TLV431A)
3
IK
CL − Load Capacitance − µF
Stable
VKA = VREF
VKA = 2 V
Stable
VKA = 3 V
TA = 25°C
150 Ω
CLVbat
IK
TEST CIRCUIT FOR VKA = VREF
150 Ω
CLVbat
IK
R1 = 10 kΩ
R2
TEST CIRCUIT FOR VKA = 2 V, 3 V
−
+
−
+
IK = 15 mA Max
− Cathode Current − mA
STABILITY BOUNDARY CONDITION‡
(for TLV431B)
IK
CL − Load Capacitance − µF
9
6
0
15
0.001 0.01 0.1 1 10
12
3
Stable
VKA = 3 V
Stable
Unstable
VKA = 2 V
TA = 25°C
IK = 15 mA MAX
For VKA = VREF ,
Stable for CL = 1 pF to 10k nF
‡The areas under the curves represent conditions that may cause the device to oscillate. For VKA = 2-V and 3-V curves, R2 and Vbat were adjusted
to establish the initial VKA and IK conditions with CL = 0. Vbat and CL then were adjusted to determine the ranges of stability.
Figure 17
†Operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.
TLV431, TLV431A, TLV431B
LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139T − JULY 1996 − REVISED JUNE 2007
18 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
~
~
P
−+
P
P
VCC
VFB
Current
Sense
Gate Drive
GND
Controller
P
PPP
TLV431
or
TLV431A
or
TLV431B
VO
3.3 V
VI
120 V
Figure 18. Flyback With Isolation Using TLV431, TLV431A, or TLV431B
as Voltage Reference and Error Amplifier
Figure 18 shows the TLV431, TLV431A, or TLV431B used in a 3.3-V isolated flyback supply. Output voltage VO
can be as low as reference voltage VREF (1.24 V ±1%). 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 18.
PACKAGE OPTION ADDENDUM
www.ti.com 20-Oct-2011
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
TLV431ACDBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431ACDBVRE4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431ACDBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431ACDBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431ACDBVTE4 ACTIVE SOT-23 DBV 5 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431ACDBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431ACDBZR ACTIVE SOT-23 DBZ 3 3000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431ACDBZRG4 ACTIVE SOT-23 DBZ 3 3000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431ACLP ACTIVE TO-92 LP 3 1000 Pb-Free (RoHS) CU SN N / A for Pkg Type
TLV431ACLPE3 ACTIVE TO-92 LP 3 1000 Pb-Free (RoHS) CU SN N / A for Pkg Type
TLV431ACLPR ACTIVE TO-92 LP 3 2000 Pb-Free (RoHS) CU SN N / A for Pkg Type
TLV431ACLPRE3 ACTIVE TO-92 LP 3 2000 Pb-Free (RoHS) CU SN N / A for Pkg Type
TLV431AID ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431AIDBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431AIDBVRE4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431AIDBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431AIDBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TLV431AIDBVTE4 ACTIVE SOT-23 DBV 5 250 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM