Microsemi TL431ILP, TL431IDM, TL431BCLP, TL431BCDM, TL431CDM Datasheet

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.

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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: [phone]

1

PRODUCT DATABOOK 1996/1997

TL431/TL431A/TL431B

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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

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Copyright © 1999

Rev. 1.3 9/99