TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F DECEMBER 1991 REVISED JANUARY 2000
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
0.4% Initial Voltage Tolerance
D
0.2-
Typical Output Impedance
D
Fast Turnon . . . 500 ns
D
Sink Current Capability . . . 1 mA to 100 mA
D
Low Reference Current (REF)
D
Adjustable Output Voltage . . . V
I(ref)
to 36 V
description
The TL1431 is a precision programmable
reference with specified thermal stability over
automotive, commercial, and military
temperature ranges. The output voltage can be
set to any value between V
I(ref)
(approximately
2.5 V) and 36 V with two external resistors (see
Figure 16). This device has a typical output
impedance of 0.2
. Active output circuitry
provides a very sharp turnon characteristic,
making the device an excellent replacement for
zener diodes and other types of references in
applications such as onboard regulation,
adjustable power supplies, and switching power
supplies.
The TL1431C is characterized for operation over
the commercial temperature range of 0
C to
70
C. The TL1431Q is characterized for
operation over the full automotive temperature
range of 40
C to 125
C. The TL1431M is
characterized for operation over the full military
temperature range of 55
C to 125
C.
Copyright
2000, 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.
1
2
3
4
8
7
6
5
CATHODE
ANODE
ANODE
NC
REF
ANODE
ANODE
NC
D PACKAGE
(TOP VIEW)
NC No internal connection
ANODE terminals are connected internally.
LP PACKAGE
(TOP VIEW)
KTP PACKAGE
(TOP VIEW)
The ANODE terminal is in electrical contact with the
mounting base.
CATHODE
ANODE
REF
CATHODE
ANODE
REF
ANODE
FK PACKAGE
(TOP VIEW)
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
NC
NC
NC
ANODE
NC
NC
NC
NC
NC
NC
NC
CA
THODE
NC
NC
NC
REF
NC
NC
NC
NC
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.
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
1
2
3
4
8
7
6
5
CATHODE
NC
NC
NC
REF
NC
ANODE
NC
JG PACKAGE
(TOP VIEW)
NC No internal connection
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F DECEMBER 1991 REVISED JANUARY 2000
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
AVAILABLE OPTIONS
PACKAGED DEVICES
TA
SMALL
OUTLINE
(D)
PLASTIC
FLANGE
MOUNTED
(KTP)
TO-226AA
(LP)
CHIP
CARRIER
(FK)
CERAMIC
DIP
(JG)
CHIP
FORM
(Y)
0
C to 70
C
TL1431CD
TL1431CKTPR
TL1431CLP
40
C to 125
C
TL1431QD
TL1431QLP
TL1431Y
55
C to 125
C
TL1431MFK
TL1431MJG
The D and LP packages are available taped and reeled. The KTP package is only available taped and reeled. Add the suffix R
to the device type (e.g., TL1431CDR). Chip forms are tested at 25
C.
logic symbol
REF
ANODE
CATHODE
functional block diagram
+
CATHODE
ANODE
REF
Vref
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F DECEMBER 1991 REVISED JANUARY 2000
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
equivalent schematic
CATHODE
REF
ANODE
800
2.4 k
4 k
20 pF
1 k
7.2 k
800
800
150
10 k
3.28 k
20 pF
1
8
2,3,6,7
All component values are nominal.
Pin numbers shown are for the D package.
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F DECEMBER 1991 REVISED JANUARY 2000
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Cathode voltage,V
KA
(see Note 1)
37 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous cathode current range, I
KA
100 mA to 150 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference input current range, I
I(ref)
50
A to 10 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Notes 2 and 3): D package
97
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
KTP package
28
C/W
. . . . . . . . . . . . . . . . . . . . . . . . .
LP package
156
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
260
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
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. All voltage values are with respect to ANODE unless otherwise noted.
2. Maximum power dissipation is a function of TJ(max),
JA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) TA)/
JA. Operating at the absolute maximum TJ of 150
C can impact reliability.
3. The package thermal impedance is calculated in accordance with JESD 51.
POWER DISSIPATION RATING TABLE FREE-AIR TEMPERATURE
PACKAGE
TA = 25
C
POWER RATING
DERATING
FACTOR ABOVE
TA = 25
C
TA = 70
C
POWER RATING
TA = 85
C
POWER RATING
TA = 125
C
POWER RATING
FK
1375 mW
11.0 mW/
C
880 mW
715 mW
275 mW
JG
1050 mW
8.4 mW/
C
672 mW
546 mW
210 mW
recommended operating conditions
MIN
MAX
UNIT
VKA
Cathode voltage
VI(ref)
36
V
IKA
Cathode current
1
100
mA
TL1431C
0
70
TA
Operating free-air temperature
TL1431Q
40
125
C
TL1431M
55
125
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F DECEMBER 1991 REVISED JANUARY 2000
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics at specified free-air temperature, I
KA
= 10 mA (unless otherwise noted)
PARAMETER
TEST CONDITIONS
TA
TEST
TL1431C
UNIT
PARAMETER
TEST CONDITIONS
TA
CIRCUIT
MIN
TYP
MAX
UNIT
Reference
25
C
2490
2500
2510
VI(ref)
Reference
input voltage
VKA = VI(ref)
Full
range
Figure 1
2480
2520
mV
VI(dev)
Deviation of reference input
voltage over full temperature
range
VKA = VI(ref)
Full
range
Figure 1
4
20
mV
D
V
I(ref)
D
V
KA
Ratio of change in reference
input voltage to the change in
cathode voltage
VKA = 3 V to 36 V
Full
range
Figure 2
1.1
2
mV/V
Reference
25
C
1.5
2.5
II(ref)
Reference
input current
R1 = 10 k
,
R2 =
Full
range
Figure 2
3
A
II(dev)
Deviation of reference input
current over full temperature
range
R1 = 10 k
,
R2 =
Full
range
Figure 2
0.2
1.2
A
Minimum cathode current for
regulation
VKA = VI(ref) to 36 V
25
C
Figure 1
0.45
1
mA
Off state
25
C
0.18
0.5
Ioff
Off-state
cathode current
VKA = 36 V,
VI(ref) = 0
Full
range
Figure 3
2
A
|zKA|
Output impedance
VKA = VI(ref), f
1 kHz,
IKA = 1 mA to 100 mA
25
C
Figure 1
0.2
0.4
Full range is 0
C to 70
C for C-suffix devices.
The deviation parameters VI(dev) and II(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
a
V
I(ref)
is defined as:
where:
TA is the rated operating temperature range of the device.
Max VI(ref)
Min VI(ref)
TA
VI(dev)
a
V
I(ref)
ppm
C
+
V
I(dev)
V
I(ref)
at 25
C
10
6
D
T
A
a
V
I(ref)
is positive or negative depending on whether minimum VI(ref) or maximum VI(ref), respectively, occurs at the lower temperature.
The output impedance is defined as: z
KA
+
D
V
KA
D
I
KA
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: |z
|
+ D
V
D
I
,
which is approximately equal to z
KA
1
)
R1
R2
.
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