Microsemi TL431ILP, TL431IDM, TL431BCLP, TL431BCDM, TL431CDM Datasheet
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TL431/TL431A/TL431B
P
RECISION PROGRAMMABLE REFERENCES
T HE I NFINITE P OWER OF I NNOVATION
DESCRIPTION KEY FEATURES
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
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
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.
P RECISION PROGRAMMABLE REFERENCES
V
IN
V
OUT
P RODUCTION DATA SHEET
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
TL431/A
& TL431B
0 to 70 1% TL431ACDM TL431ACLP
-40 to 85 1% TL431AIDM TL431AILP
R1
VO = 1 +
R2
*
R1
R2
PACKAGE ORDER INFORMATION
T
(°C)
A
Initial
Tolerance
2% TL431CDM TL431CLP
0.4% TL431BCDM TL431BCLP
2% TL431IDM TL431ILP
0.4% TL431BIDM TL431BILP
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.
Plastic SOIC
DM
8-pin
LP
V
REF
Plastic TO-92
3-pin
Copyright © 1999
Rev. 1.3 9/99
L INF INITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
TL431/TL431A/TL431B
P
RECISION PROGRAMMABLE REFERENCES
P RODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS (Note 1)
Cathode to Anode Voltage (VKA) (Note 2) .................................................... -0.3V to 37V
Reference Input Current (I
Continuous Cathode Current (I
Operating Junction Temperature
) ................................................................... -50µA to 10mA
REF
) ......................................................... -100mA to 150mA
K
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
Note 2. Voltage values are with respect to the anode terminal unless otherwise noted.
to Ground. Currents are positive into, negative out of the specified terminal. Pin
numbers refer to DIL packages only.
THERMAL DATA
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θθ
θ
θθ
JA
165°C/W
LP PACKAGE:
D
x θ
θθ
θ
θθ
JA
).
JA
156°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Junction Temperature Calculation: TJ = TA + (P
The θ
numbers are guidelines for the thermal performance of the device/pc-board system.
JA
All of the above assume no ambient airflow
BLOCK DIAGRAM
PACKAGE PIN OUTS
CATHODE
N.C.
ANODE
N.C.
1 8
2 7
3 6
4 5
DM PACKAGE
(Top View)
LP PACKAGE
(Top View)
REF
ANODE
ANODE
N.C.
1. CATHODE
2. ANODE
3. REF
Ref (R)
Cathode (K)
V
REF
Anode (A)
2
Copyright © 1999
Rev. 1.3 9/99
PRODUCT DATABOOK 1996/1997
TL431/TL431A/TL431B
P
RECISION PROGRAMMABLE REFERENCES
P RODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS (Note 3)
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for TL431C/TL431AC/TL431BC with 0°C ≤ TA ≤ 70°C,
TL431I/TL431AI/TL431BI with -40°C ≤ TA ≤ 85°C.)
Parameter
Reference Input Voltage TL431 V
TL431A I
TL431B IK = 10mA, VKA = V
Reference Drift TL431C IK = 10mA, VKA = V
TL431I IK = 10mA, VKA = V
TL431AC ∆V
TL431AI ∆V
TL431BC IK = 10mA, VKA = V
TL431BI IK = 10mA, VKA = V
Symbol
REFIK
REFIK
KAIK
= 10mA, VKA = V
= 10mA, VKA = V
K
= 10mA, VKA = V
= 10mA, VKA = V
Test Conditions
, TA = 25°C
REF
, TA = 25°C
REF
, TA = 25°C
REF
REF
REF
REF
REF
REF
REF
Voltage Ratio, Ref to Cathode TL431, TL431A IK = 10mA, VKA = 2.5V to 36V
(Note 4) TL431B IK = 10mA, VKA = 2.5V to 36V
Reference Input Current TL431,TL431A I
REFVKA
TL431B
Minimum Operating Current I
Off-State Cathode Current TL431 I
MINVKA
OFFVKA
TL431A VKA = V
TL431B
Dynamic Impedance TL431 | ZKA |VKA = V
TL431B VKA = V
= V
, TA = 25°C
REF
VKA = V
, TA = 25°C
REF
VKA = V
, TA = Operating Range
REF
= V
to 36V
REF
= V
to 36V, TA = 25°C
REF
to 36V, TA = 25°C
REF
VKA = V
to 36V, TA = Operating Range
REF
VKA = 36V, V
= 0V, TA = 25°C
REF
, I
= 1mA to 100mA, f ≤ 1kHz, T
REF
K
, I
= 1mA to 100mA, f ≤ 1kHz, T
REF
K
Note 3. These parameters are guaranteed by design.
∆V
Note 4. Ratio of change in reference input voltage
REF
∆V
KA
to the change in cathode voltage.
= 25°C
A
= 25°C
A
TL431/431A/431B
Min. Typ. Max.
Units
2440 2495 2550 mV
2470 2495 2520 mV
2490 2500 2510 mV
417 mV
530 mV
417 mV
530 mV
415 mV
520 mV
-1.4 -2.7 mV/V
-1.1 -2 mV/V
24 µA
1.5 1.9 µA
2.3 µA
0.4 1 mA
0.1 1 µA
0.1 1 µA
2µA
0.18 0.5 µA
0.2 0.5 Ω
0.1 0.2 Ω
Copyright © 1999
Rev. 1.3 9/99
3
PRODUCT DATABOOK 1996/1997
TL431/TL431A/TL431B
P
RECISION PROGRAMMABLE REFERENCES
P RODUCTION DATA SHEET
GRAPH / CURVE INDEX FIGURE 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
Parameter Measurement Information
FIGURE #
8. TEST CIRCUIT FOR V
9. TEST CIRCUIT FOR VKA > V
10. TEST CIRCUIT FOR I
= V
KA
REF
REF
OFF
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
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
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