TL431 / TL431A / TL431B
TM
®
Precision programmable References
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
INITIAL VOLTAGE REFERENCE
ACCURACY OF 0.4% (TL431B)
SINK CURRENT CAPABILITY 1mA
to 100mA
TYPICAL OUTPUT DYNAMIC
IMPEDANCE LESS THAN 200mΩ;
TYPICAL OUTPUT IMPEDANCE OF
THE TL431B LESS THAN 100mΩ
ADJUSTABLE OUTPUT VOLTAGE
FROM 2.5V TO 36V
AVAILABLE IN SURFACE-MOUNT
PACKAGES
LOW OUTPUT NOISE
TYPICAL EQUIVALENT FULL
RANGE TEMPERATURE
COEFFICIENT OF 30ppm/°C
DIRECT PIN-TO-PIN
REPLACEMENT FOR INDUSTRY
STANDARD TL431 AND TL1431
WWW .
Microsemi
.C
OM
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
Precision Programmable References
TL431/A
& TL431B
O
B
R
EC
S
OM
OL
ME
ET
ND
E
ED
V
IN
F
O
O
R
DU
N
E
C
W
T
D
E
V
OUT
R1
R2
V
O
=
⎜
1+
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
P
R
⎛
⎝
PACKAGE ORDER INFO
N
O
T
A
(°C)
Initial
Tolerance
2%
1%
0.4%
2%
1%
0.4%
DM
Plastic SOIC
8-Pin
LP
Plastic TO-92
3-Pin
TL431CLP
TL431ACLP
TL431BCLP
TL431ILP
TL431AILP
TL431BILP
T
RoHS Compliant / Pb-free
Transition DC: 0440
RoHS Compliant / Pb-free
Transition DC: 0509
SI
GN
S
R1
⎞
R2
⎠
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.
⎟
•V
REF
PK
Plastic TO-89
3 - Pin
RoHS Compliant / Pb-free
Transition DC: 0518
TL431
X
TL431
X
0 to 70
-40 to 85
TL431CDM
TL431ACDM
TL431BCDM
TL431IDM
TL431AIDM
TL431BIDM
TL431CPK
TL431ACPK
TL431BCPK
TL431IPK
TL431AIPK
TL461BIPK
Note: All surface mount packages are available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LTL431AIDM-TR). The
TO-92 (LP) package is available in ammo-pack.
Copyright
©
1999
Rev. 1.4, 2006-09-26
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
TL431 / TL431A / TL431B
TM
®
Precision programmable References
P
RODUCTION
D
ATA
S
HEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
F
O
O
R
DU
N
E
C
W
T
D
E
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal
.
Note 2. Voltage values are with respect to the anode terminal unless otherwise noted.
Cathode
SI
GN
S
Cathode to Anode Voltage (VKA)(Note 2) ....................................................... -0.3 to 37V
Reference Input Current (IREF).................................................................. -50µA to 10mA
Continuous Cathode Current (IK) .......................................................... -100mA to 150mA
Operating Junction Temperature................................................................................ 150°C
Storage Temperature Range.........................................................................-65°C to 150°C
Package Peak Temp. for Solder Reflow (40 seconds maximum exposure) ... 260°C (+0 -5)
WWW .
Microsemi
.C
OM
3. Cathode
2. Anode
1. Ref
LP P
ACKAGE
(Top View)
1
8
Ref
Anode
Anode
N.C.
N.C.
2
7
THERMAL DATA
Anode
N.C.
3
6
4
5
DM
PK
LP
Plastic SOIC 8-Pin
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
Plastic TO-89 3-Pin
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
Plastic TO-92 3-Pin
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
DM P
ACKAGE
(Top View)
165°C/W
3
Cathode
Anode
Ref
P
R
2
71°C/W
1
PK P
ACKAGE
(Top View)
EC
S
OM
OL
ME
ET
ND
E
ED
156°C/W
RoHS / Pb-free 100% Matte Tin Lead Finish
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)
T
O
B
R
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
N
O
V
REF
Copyright
©
1999
Rev. 1.4, 2006-09-26
Anode (A)
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
TL431 / TL431A / TL431B
TM
®
Precision programmable References
P
RODUCTION
D
ATA
S
HEET
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the operating ambient temperature for the TL431C/TL431AC/TL431BC with
0°C < T
A
< 70°C, and TL431I/TL431AI/TL431BI with -40°C < T
A
< 85°C
WWW .
Microsemi
.C
OM
ΔV
REF
ΔV
KA
F
O
O
R
DU
N
E
C
W
T
D
E
EC
S
OM
OL
ME
ET
ND
E
ED
TL431
TL431A
TL431B
TL431C
TL431I
TL431AC
Reference Drift
TL431AI
TL431BC
TL431BI
TL431,
Voltage Ratio, Ref to
TL431A
Cathode (Note 4)
TL431B
TL431,
Reference Input
TL431A
Current
TL431B
Minimum Operating Current
TL431
TL431A
Off-State Cathode
Current
TL431B
Reference Input
Voltage
V
REF
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
SI
GN
S
2440
2470
2490
Parameter
Symbol
Test Conditions
TL431/A/B
Min
Typ
Max
2495
2495
2500
4
5
4
5
4
5
2550
2520
2510
17
30
17
30
15
20
Units
mV
mV
I
K
= 10mA, V
KA
= 2.5V to 36V
I
K
= 10mA, V
KA
= 2.5V to 36V
-1.4
-1.1
2
1.5
0.4
0.1
0.1
0.18
0.2
0.1
-2.7
-2.0
4
1.9
1
1
1
2
0.5
0.5
mV/V
I
MIN
I
OFF
TL431
Dynamic Impedance
TL431B
I Z
KA
I
V
KA
= V
REF
, T
A
= 25°C
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
P
R
I
REF
V
KA
= V
REF
, T
A
= 25°C
µA
mA
µA
Ω
0.2
Note 3: These parameters are guaranteed by design.
Note 4:
ΔV
REF
ΔV
KA
Ratio of change in reference input voltage to the change in cathode voltage.
N
O
T
O
B
R
E
LECTRICALS
E
LECTRICALS
Copyright
©
1999
Rev. 1.4, 2006-09-26
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
TL431 / TL431A / TL431B
TM
®
Precision programmable References
P
RODUCTION
D
ATA
S
HEET
GRAPH / CURVE INDEX
Characteristic Curves
Figure #
1.
Reference Input Voltage vs. Free-Air Temperature
2.
Reference INput Current vs. Free-Air Temperature
3.
Cathode Current vs. Cathode Voltage
4.
Cathode Current vs. Cathode Voltage
5.
Off-State Cathode Current vs. Free-Air Temperature
6.
Ratio of Delta Reference Voltage to Delta Cathode
Voltage vs. Free-Air Temperature
7.
Equivalent Input Noise Voltage vs. Frequency
FIGURE INDEX
Parameter Measurement Information
Figure #
8.
Test Circuit For V
KA
= V
REF
9.
Test Circuit For V
KA
> V
REF
10.
Test Circuit for I
OFF
WWW .
Microsemi
.C
OM
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
N
O
T
O
B
R
EC
S
OM
OL
ME
ET
ND
E
ED
F
O
O
R
DU
N
E
C
W
T
D
E
Typical Characteristics
Figure #
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
P
R
SI
GN
S
C
HARTS
C
HARTS
Copyright
©
1999
Rev. 1.4, 2006-09-26
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
TL431 / TL431A / TL431B
TM
®
Precision programmable References
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC CURVES
2.60
2.58
5
WWW .
Microsemi
.C
OM
(V
REF
) Reference Input Voltage - (V)
2.54
2.52
TL431/A
2.50
2.48
2.46
2.44
2.42
2.4
-50
TL431/A
V
REF
= 2495mV
TL431/A
V
REF
= 2440mV
-25
0
25
50
75
100
125
F
O
O
R
DU
N
E
C
W
T
D
E
2
TL431B
3
TL431/A
TL431B
1
P
R
0
-50
-25
0
SI
GN
S
25
50
75
100
2.56
V
REF
= 2550mV
(I
REF
) Reference Input Current - (µA)
V
REF
= V
KA
I
K
= 10mA
4
I
K
= 10mA
R1 =
I
K
= 10mA
125
(T
A
) Ambient Temperature - (°C)
Figure 1 –
Reference Voltage vs. Free-Air Temperature
(T
A
) Ambient Temperature - (°C)
150
125
EC
S
OM
OL
ME
ET
ND
E
ED
(I
K
) Cathode Current - (µA)
Figure 2 –
Reference Current vs. Free-Air Temperature
800
V
KA
= V
REF
T
A
= 25 °C
V
KA
= V
REF
T
A
= 25 °C
600
(I
K
) Cathode Current - (µA)
100
75
50
25
0
-25
-50
-75
-100
-2
-1
400
I
MIN
O
B
R
TL431/A
200
TL431B
0
N
O
T
0
1
23
-200
-1
0
1
23
C
HARTS
C
HARTS
(V
KA
) Cathode Voltage - (V)
Figure 3 –
Cathode Current vs. Cathode Voltage
(V
KA
) Cathode Voltage - (V)
Figure 4 –
Cathode Current vs. Cathode Voltage
Copyright
©
1999
Rev. 1.4, 2006-09-26
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
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