Document Outline
- DESCRIPTION
- FEATURES
- PIN CONFIGURATIONS
- ORDERING INFORMATION
- ABSOLUTE MAXIMUM RATINGS
- RECOMMENDED OPERATING CONDITIONS
- DC ELECTRICAL CHARACTERISTICS
- PARAMETER MEASUREMENT INFORMATION
- TYPICAL CHARACTERISTICS
- TYPICAL APPLICATIONS
- PACKAGE OUTLINES
- SOT96-1
- SOT97-1
- SOT54
- TO-92
- Tape splicing
- Bulk packing
- DEFINITIONS
Philips
Semiconductors
TL431C, TL431AC, TL431I,
TL431AI, LM431AC
Adjustable precision shunt regulators
Product specification
1997 Feb 25
INTEGRATED CIRCUITS
Philips Semiconductors
Product specification
TL431C, TL431AC, TL431I,
TL431AI, LM431AC
Adjustable precision shunt regulators
2
1997 Feb 25
8531927 17795
DESCRIPTION
The TL431 and TL431A are 3-terminal adjustable shunt regulators
with specified thermal stability over applicable automotive and
commercial temperature ranges. The output voltage may be set to
any value between V
REF
(approximately 2.5V) and 36V with two
external resistors (see Figure 4). These devices have a typical
output impedance of 0.2
. Active output circuitry provides a very
sharp turn-on characteristic, making these devices excellent
replacements for zener diodes in many applications like on-board
regulation, adjustable power supplies and switching power supplies.
The TL431C and TL431AC are characterized for operation from
0
C to +70
C; the TL431I and TL431AI are characterized for
operation from 40
C to +85
C.
FEATURES
Equivalent full-range temperature coefficient: 30ppm/
C
0.2
typical output impedance
Sink current capability: 1mA to 100mA
Low output noise
Adjustable output voltage: V
REF
to 36V
PIN CONFIGURATIONS
1
2
3
4
5
6
7
8
CATHODE
ANODE
ANODE
NC
REF
ANODE
ANODE
NC
CATHODE
ANODE
REF
M, D Package
SOT96-1
1
2
3
4
5
6
7
8
CATHODE
NC
NC
NC
REF
NC
ANODE
NC
N, P Package
SOT97-1
Z, LP, U Package
SOT54
SL01167
TOP VIEW
TOP VIEW
Figure 1.
Pin Configuration
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE
RANGE
INDUSTRY STANDARD
PART NUMBER
ORDER CODE
DWG #
3-Pin Plastic TO92
2
0
C to +70
C
TL431CLP
TL431CLPU
SOT54
3-Pin Plastic TO92
2
0
C to +70
C
TL431ACLP
TL431ACLPU
SOT54
3-Pin Plastic TO92
2
40
C to +85
C
TL431ILP
TL431ILPU
SOT54
3-Pin Plastic TO92
2
40
C to +85
C
TL431AILP
TL431AILPU
SOT54
3-Pin Plastic TO92
2
0
C to +70
C
LM431ACZ
LM431ACZU
SOT54
8-Pin Plastic Small Outline (SO) package
0
C to +70
C
TL431CD
TL431CD
SOT96-1
8-Pin Plastic Small Outline (SO) package
40
C to +85
C
TL431ID
TL431ID
SOT96-1
8-Pin Plastic Small Outline (SO) package
0
C to +70
C
TL431ACD
TL431ACD
SOT96-1
8-Pin Plastic Small Outline (SO) package
40
C to +85
C
TL431AID
TL431AID
SOT96-1
8-Pin Plastic Small Outline (SO) package
0
C to +70
C
LM431ACM
LM431ACMD
SOT96-1
8-Pin Plastic Dual In-Line package (DIP)
0
C to +70
C
TL431CP
TL431CPN
SOT97-1
8-Pin Plastic Dual In-Line package (DIP)
40
C to +85
C
TL431IP
TL431IPN
SOT97-1
8-Pin Plastic Dual In-Line package (DIP)
0
C to +70
C
TL431ACP
TL431ACPN
SOT97-1
8-Pin Plastic Dual In-Line package (DIP)
40
C to +85
C
TL431AIP
TL431AIPN
SOT97-1
NOTE:
1. SYMBOL INFORMATION: Parts will be marked with product name including temperature and electrical grade desginators, but not the
package identifier.
2. TO92 is normally shipped in bulk, i.e., in plastic bags (containing 1,000 parts), 5 bags per box. Tape and reel (or ammo box) is an option.
See page 15 for information.
Philips Semiconductors
Product specification
TL431C, TL431AC, TL431I,
TL431AI, LM431AC
Adjustable precision shunt regulators
1997 Feb 25
3
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
RATING
UNITS
V
KA
Cathode voltage (see Note 1)
37
V
Continuous cathode current range
100 to +150
mA
Reference input current range
0.05 to 10
mA
Operating free-air temperature range
T
amb
C suffix
0 to +70
C
I suffix
40 to +85
C
T
STG
Temperature storage range
65 to 150
C
Lead temperature 1.6mm (1/16 in.) from case for 10 sec: D or P pkgs
260
C
Lead temperature 1.6mm (1/16 in.) from case for 60 sec: LP pkg
300
C
NOTE:
1. Voltage values are with respect to the anode terminal unless otherwise noted.
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
MIN
MAX
UNITS
V
KA
Cathode voltage
V
REF
36
V
I
K
Cathode current
1
100
mA
Table 1. Dissipation Rating Table Free-Air Temperature
Package
Derating Factor Above T
amb
= 25
C
T
amb
= 25
C
Power Rating
T
amb
= 70
C
Power Rating
T
amb
= 85
C
Power Rating
D
5.8mW/
C
725mW
464mW
429mW
LP
6.2mW/
C
775mW
496mW
403mW
P
8.0mW/
C
1000mW
640mW
520mW
CATHODE
REF
ANODE
Q5
QD6
R5
3.28K
R11
2.4K
Q11
Q10
R9
800
R8
1000
Q9
C2
20p
R10
7.2K
R7
320
Q8
QD2
R1
10K
R2
150
Q2
Q1
Qq1
C1
20p
R3
800
R4
800
Q4
Q7
SL01188
Q3
Figure 2.
Equivalent Schematic
Philips Semiconductors
Product specification
TL431C, TL431AC, TL431I,
TL431AI, LM431AC
Adjustable precision shunt regulators
1997 Feb 25
4
DC ELECTRICAL CHARACTERISTICS
25
C free-air temperature, unless otherwise stated.
TEST
LIMITS
SYMBOL
PARAMETER
TEST
CKT
TEST CONDITIONS
TL431AC
TL431C/LM431AC
UNIT
CKT
MIN
TYP
MAX
MIN
TYP
MAX
V
REF
Reference input voltage
Fig. 3
V
KA
= V
REF
, I
K
= 10mA
2470
2495
2520
2440
2495
2550
mV
V
REF(dev)
Deviation of reference input
voltage over full
temperature range
3
Fig. 3
V
KA
= V
REF
, I
K
= 10mA,
T
amb
= full range
2
4
15
4
17
mV
D
V
REF
Ratio of change in reference
input voltage to the change
Fig 4
I = 10mA
V
KA
= 10V V
REF
1.4
2.7
1.4
2.7
mV/V
REF
D
V
KA
in ut voltage to the change
in cathode voltage
Fig. 4
I
K
= 10mA
V
KA
= 36V 10V
1
2
1
2
mV/V
I
REF
Reference input current
Fig. 4
I
K
= 10mA, R
1
= 10k
, R
2
=
2
4
2
4
A
I
REF(dev)
Deviation of reference input
current over full temperature
range
3
Fig. 4
I
K
= 10mA, R
1
= 10k
, R
2
=
,
T
amb
= full range
2
0.8
1.2
0.4
1.2
A
I
MIN
Minimum cathode current
for regulation
Fig. 3
V
KA
= V
REF
0.4
0.6
0.4
1
mA
I
OFF
Off-state cathode current
Fig. 5
V
KA
= 36V, V
REF
= 0
0.1
0.5
0.1
1
A
| Z
KA
|
Dynamic impedance
4
Fig. 3
V
KA
= V
REF
, I
K
= 1mA to 100mA,
f
1kHz
0.2
0.5
0.2
0.5
25
C free-air temperature, unless otherwise stated.
TEST
LIMITS
SYMBOL
PARAMETER
TEST
CKT
TEST CONDITIONS
TL431AI
TL431I
UNIT
CKT
MIN
TYP
MAX
MIN
TYP
MAX
V
REF
Reference input voltage
Fig. 3
V
KA
= V
REF
, I
K
= 10mA
2470
2495
2520
2440
2495
2550
mV
V
REF(dev)
Deviation of reference input
voltage over full
temperature range
3
Fig. 3
V
KA
= V
REF
, I
K
= 10mA,
T
amb
= full range
2
5
25
5
30
mV
D
V
REF
Ratio of change in reference
input voltage to the change
Fig 4
I = 10mA
V
KA
= 10V V
REF
1.4
2.7
1.4
2.7
mV/V
REF
D
V
KA
in ut voltage to the change
in cathode voltage
Fig. 4
I
K
= 10mA
V
KA
= 36V 10V
1
2
1
2
mV/V
I
REF
Reference input current
Fig. 4
I
K
= 10mA, R
1
= 10k
, R
2
=
2
4
2
4
A
I
REF(dev)
Deviation of reference input
current over full temperature
range
3
Fig. 4
I
K
= 10mA, R
1
= 10k
, R
2
=
,
T
amb
= full range
2
0.8
2.5
0.8
2.5
A
I
MIN
Minimum cathode current
for regulation
Fig. 3
V
KA
= V
REF
0.4
0.7
0.4
1
A
I
OFF
Off-state cathode current
Fig. 5
V
KA
= 36V, V
REF
= 0
0.1
0.5
0.1
1
A
| Z
KA
|
Dynamic impedance
4
Fig. 3
V
KA
= V
REF
, I
K
= 1mA to 100mA,
f
1kHz
0.2
0.5
0.2
0.5
NOTES:
2. Full temperature range is 40
C to +85
C for the TL431I and TL431AI, and 0
C to +70
C for the TL431C and TL431AC.
3. The deviation parameters V
REF(dev)
and I
REF(dev)
are defined as the differences between the maximum and minimum values obtained over
the rated termperature range. The average full-range temperature coefficient of the reference input voltage,
V
REF
, is defined as:
|
a
V
REF
|
ppm
deg C
+
V
REF(dev)
V
REF
at 25oC
@
10
6
D
T
amb
V
REF(dev)
Max V
REF
Min V
REF
T
amb
where
T
amb
is the rated operating free-air temperature range of the device.
Philips Semiconductors
Product specification
TL431C, TL431AC, TL431I,
TL431AI, LM431AC
Adjustable precision shunt regulators
1997 Feb 25
5
V
REF
can be positive or negative depending on whether minimum V
REF
of maximum V
REF
, respectively, occurs at the lower temperature.
Example: Max V
REF
= 2496mV at 30
C, Min V
REF
= 2492mV at 0
C, V
REF
= 2495mV at 25
C, DTA = 70
C for TL431C.
|
a
V
REF
|
+
4mV
2495mV
@
10
6
70
o
C
+
23ppm
o
C
Because minimum V
REF
occurs at the lower temperature, the coefficient is positive.
4. The dynamic impedance is defined as: | Z
KA
|
+
D
V
KA
D
I
K
When the device is operating with two external resistors, (see Figure xx), the total dynamic impedance of the circuit is given by:
| Z |
+ D
V
D
I
[
| Z
KA
|
1
)
R1
R2
PARAMETER MEASUREMENT INFORMATION
INPUT
V
ref
V
KA
I
K
SL01177
Figure 3.
Test Circuit for V
KA
= V
ref
R1
R2
INPUT
V
ref
V
KA
I
ref
I
K
V
KA
+
V
ref
1
)
R1
R2
)
I
ref
R1
SL01178
Figure 4.
Test Circuit for V
KA
> V
ref
INPUT
V
KA
I
off
SL01179
Figure 5.
Test Circuit for I
OFF
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