TL431/TL431A/TL431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
The TL431/TL431A/TL431B series
precision adjustable three terminal shunt
voltage regulators are pin-to-pin
compatible with the industry standard
TL431. The output voltage of this
reference is programmable by using two
external resistors from 2.5V to 36V.
These devices offer low output
impedance for improved load regulation.
The typical output impedance of these
devices is 200mΩ. These devices find
application in the feedback path of
switching power supplies, OVP
crowbar circuits, reference for A/D,
D/A, and as zener diodes with
improved turn-on characteristics.
K E Y F E AT U R E S
W
INITIAL VOLTAGE REFERENCE ACCURACY OF
0.4% (TL431B)
W
SINK CURRENT CAPABILITY 1mA to 100mA
W
TYPICAL OUTPUT DYNAMIC IMPEDANCE
LESS THAN 200mΩ;
TYPICAL OUTPUT IMPEDANCE OF THE
TL431B LESS THAN 100mΩ
W
ADJUSTABLE OUTPUT VOLTAGE FROM 2.5V
TO 36V
W
AVAILABLE IN SURFACE-MOUNT PACKAGES
W
LOW OUTPUT NOISE
W
TYPICAL EQUIVALENT FULL RANGE
TEMPERATURE COEFFICIENT OF 30ppm/°C
W
DIRECT PIN-TO-PIN REPLACEMENT FOR
INDUSTRY STANDARD TL431 AND TL1431
NOTE:
For current data & package dimensions, visit our web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
V
IN
R1
V
OUT
TL431/A
& TL431B
R2
V
O
=
1 +
R1
R2
* V
REF
PA C K A G E O R D E R I N F O R M AT I O N
T
A
(°C)
0 to 70
Initial
Tolerance
2%
1%
0.4%
2%
1%
0.4%
DM
Plastic SOIC
8-pin
TL431CDM
TL431ACDM
TL431BCDM
TL431IDM
TL431AIDM
TL431BIDM
LP
Plastic TO-92
3-pin
TL431CLP
TL431ACLP
TL431BCLP
TL431ILP
TL431AILP
TL431BILP
-40 to 85
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. TL431CDMT)
TO-92 (LP) package also available in ammo-pack.
Copyright © 1999
Rev. 1.3 9/99
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
TL431/TL431A/TL431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P
R O D U C T I O N
D
A T A
S
H E E T
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PACKAGE PIN OUTS
Cathode to Anode Voltage (V
KA
) (Note 2) .................................................... -0.3V to 37V
Reference Input Current (I
REF
) ................................................................... -50µA to 10mA
Continuous Cathode Current (I
K
) ......................................................... -100mA to 150mA
Operating Junction Temperature
Plastic (DM, LP Packages) .................................................................................... 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature ..................................................................................................... 300°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect
to Ground. Currents are positive into, negative out of the specified terminal. Pin
numbers refer to DIL packages only.
Note 2. Voltage values are with respect to the anode terminal unless otherwise noted.
CATHODE
N.C.
ANODE
N.C.
1
2
3
4
8
7
6
5
REF
ANODE
ANODE
N.C.
DM PACKAGE
(Top View)
1.
CATHODE
2.
ANODE
3.
REF
T H E R M A L D ATA
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
LP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
156°C/W
165°C/W
LP PACKAGE
(Top View)
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow
BLOCK DIAGRAM
Cathode (K)
Ref (R)
V
REF
Anode (A)
2
Copyright © 1999
Rev. 1.3 9/99
PRODUCT DATABOOK 1996/1997
TL431/TL431A/TL431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P
R O D U C T I O N
D
A T A
S
H E E T
ELECTRICAL CHARACTERISTICS
(Note 3)
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for TL431C/TL431AC/TL431BC with 0°C
≤
T
A
≤
70°C,
TL431I/TL431AI/TL431BI with -40°C
≤
T
A
≤
85°C.)
Parameter
Reference Input Voltage
TL431
TL431A
TL431B
TL431C
TL431I
TL431AC
TL431AI
TL431BC
TL431BI
TL431, TL431A
TL431B
TL431,TL431A
TL431B
Minimum Operating Current
Off-State Cathode Current
Symbol
V
REF
Test Conditions
I
K
= 10mA, V
KA
= V
REF
, T
A
= 25°C
I
K
= 10mA, V
KA
= V
REF
, T
A
= 25°C
I
K
= 10mA, V
KA
= V
REF
, T
A
= 25°C
I
K
= 10mA, V
KA
= V
REF
I
K
= 10mA, V
KA
= V
REF
I
K
= 10mA, V
KA
= V
REF
I
K
= 10mA, V
KA
= V
REF
I
K
= 10mA, V
KA
= V
REF
I
K
= 10mA, V
KA
= V
REF
I
K
= 10mA, V
KA
= 2.5V to 36V
I
K
= 10mA, V
KA
= 2.5V to 36V
V
KA
= V
REF
, T
A
= 25°C
V
KA
= V
REF
, T
A
= 25°C
V
KA
= V
REF
, T
A
= Operating Range
V
KA
= V
REF
to 36V
V
KA
= V
REF
to 36V, T
A
= 25°C
V
KA
= V
REF
to 36V, T
A
= 25°C
V
KA
= V
REF
to 36V, T
A
= Operating Range
V
KA
= 36V, V
REF
= 0V, T
A
= 25°C
V
KA
= V
REF
, I
K
= 1mA to 100mA, f
≤
1kHz, T
A
= 25°C
V
KA
= V
REF
, I
K
= 1mA to 100mA, f
≤
1kHz, T
A
= 25°C
TL431/431A/431B
Units
Min. Typ. Max.
2440 2495 2550
2470 2495 2520
2490 2500 2510
4
17
5
30
4
17
5
30
4
15
5
20
-1.4 -2.7
-1.1
-2
2
4
1.5 1.9
2.3
0.4
1
0.1
1
0.1
1
2
0.18 0.5
0.2 0.5
0.1 0.2
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV/V
mV/V
µA
µA
µA
mA
µA
µA
µA
µA
Ω
Ω
Reference Drift
∆V
REF
∆V
KA
Voltage Ratio, Ref to Cathode
(Note 4)
Reference Input Current
I
REF
TL431
TL431A
TL431B
I
MIN
I
OFF
Dynamic Impedance
TL431
TL431B
| Z
KA
|
Note 3. These parameters are guaranteed by design.
Note 4.
∆V
REF
∆V
KA
Ratio of change in reference input voltage
to the change in cathode voltage.
Copyright © 1999
Rev. 1.3 9/99
3
PRODUCT DATABOOK 1996/1997
TL431/TL431A/TL431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P
R O D U C T I O N
D
A T A
S
H E E T
GRAPH / CURVE INDEX
FIGURE INDEX
Characteristic Curves
FIGURE #
1.
2.
3.
4.
5.
6.
7.
REFERENCE INPUT VOLTAGE vs. FREE-AIR TEMPERATURE
REFERENCE INPUT CURRENT vs. FREE-AIR TEMPERATURE
CATHODE CURRENT vs. CATHODE VOLTAGE
CATHODE CURRENT vs. CATHODE VOLTAGE
OFF-STATE CATHODE CURRENT vs. FREE-AIR TEMPERATURE
RATIO OF DELTA REFERENCE VOLTAGE TO DELTA CATHODE
VOLTAGE vs. FREE-AIR TEMPERATURE
EQUIVALENT INPUT NOISE VOLTAGE vs. FREQUENCY
FIGURE #
FIGURE #
8.
9.
Parameter Measurement Information
TEST CIRCUIT FOR V
KA
= V
REF
TEST CIRCUIT FOR V
KA
> V
REF
10.
TEST CIRCUIT FOR I
OFF
Typical Characteristics
11.
EQUIVALENT INPUT NOISE VOLTAGE OVER A 10-SECOND PERIOD
12.
SMALL-SIGNAL VOLTAGE AMPLIFICATION vs. FREQUENCY
13.
REFERENCE IMPEDANCE vs. FREQUENCY
14.
PULSE RESPONSE
15.
STABILITY BOUNDARY CONDITIONS
Application Information
FIGURE #
16.
SHUNT REGULATOR
17.
SINGLE-SUPPLY COMPARATOR WITH TEMPERATURE-COMPENSATED
THRESHOLD
18.
HIGH CURRENT SHUNT REGULATOR
19.
CROWBAR CIRCUIT
20.
VOLTAGE MONITOR
21.
PRECISION CONSTANT-CURRENT SINK
4
Copyright © 1999
Rev. 1.3 9/99
PRODUCT DATABOOK 1996/1997
TL431/TL431A/TL431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P
R O D U C T I O N
D
A T A
S
H E E T
CHARACTERISTIC CURVES
FIGURE 1.
— REFERENCE VOLTAGE
vs. FREE-AIR TEMPERATURE
2.60
FIGURE 2.
— REFERENCE CURRENT
vs. FREE-AIR TEMPERATURE
5
(V
REF
) Reference Input Voltage - (V)
2.56
2.54
2.52
V
REF
= 2550mV
(I
REF
) Reference Input Current - (µA)
2.58
V
REF
= V
KA
I
K
= 10mA
TL431/A
4
I
K
= 10mA
R1 =
¥
I
K
= 10mA
TL431B
2.50
2.48
2.46
2.44
2.42
2.4
-50
3
TL431/A
2
TL431/A
V
REF
= 2495mV
TL431/A
V
REF
= 2440mV
1
TL431B
-25
0
25
50
75
100
125
0
-50
-25
0
25
50
75
100
125
(T
A
) Ambient Temperature - (°C)
(T
A
) Ambient Temperature - (°C)
FIGURE 3.
— CATHODE CURRENT vs. CATHODE VOLTAGE
150
125
FIGURE 4.
— CATHODE CURRENT vs. CATHODE VOLTAGE
800
V
KA
= V
REF
T
A
= 25°C
V
KA
= V
REF
T
A
= 25°C
(I
K
) Cathode Current - (µA)
75
50
25
0
-25
-50
-75
-100
-2
-1
0
1
2
3
(I
K
) Cathode Current - (µA)
100
600
400
I
MIN
TL431/A
TL431B
200
0
-200
-1
0
1
2
3
(V
KA
) Cathode Voltage - (V)
(V
KA
) Cathode Voltage - (V)
Copyright © 1999
Rev. 1.3 9/99
5
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