Datasheet TL1431C, TL1431ACZ, TL1431ACD, TL1431IZ, TL1431IN Datasheet (SGS Thomson Microelectronics)

1 - Cathode
2 - Anode
3 - Anode
4 - N.C.
5 - N.C.
6 - Anode
7 - Anode
8 - Reference

Z

TO92

(Plastic Package)

.

ADJUSTABLE OUTPUT VOLTAGE:
V

ref

to 36V

.

SINK CURRENTCAPABILITY : 1 to 100mA

.

TYPICALOUTPUT IMPEDANCE: 0.2Ω

.

0.4% AND 0.25%VOLTAGEPRECISION

DESCRIPTION

The TL1431is a programmableshunt voltageref­erence with guaranteed temperaturestability over
the entire temperature range of operation.
The output voltage may be set to any value be­tween V

ref

(approximately2.5V)and 36V with two
external resistors.
The TL1431 operates with a wide current range
from1 to100mAwith a typicaldynamicimpedance
of 0.2Ω.

PIN CONNECTIONS

8765

1234

SO8

(Top view)

Cathode Ano d e Reference

123

TO92

(Top view)

D

SO8

(Batwing Plastic Micropackage)

PROGRAMMABLE VOLTAGE REFERENCE

TL1431

ORDER CODES

Part number Temperature Range

Package

ZD

TL1431C/AC -20

o

C, +70oC ••

TL1431I/AI -40

o

C, +105oC ••

March 1998 1/8

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

KA

Cathode to Anode Voltage 37 V

I

K

Continuous Cathode CurrentRange -100 to +150 mA

I

ref

Reference Input Current Range -0.05 to +10 mA

T

oper

Operating Free-air Temperature Range TL1431C/AC

TL1431I/AI

-20 to +70

-40 to +105

o

C

T

stg

Storage Temperature Range -65 to +150

o

C

OPERATING CONDITIONS

Symbol Parameter Value Unit

V

KA

Cathode to Anode Voltage V

ref

to 36 V

I

K

Cathode Current 1 to 100 mA

ELECTRICALCHARACTERISTICS

T

amb

=25oC (unless otherwise specified)

Symbol Parameter

TL1431C TL1431AC

Unit

Min. Typ. Max. Min. Typ. Max.

V

ref

Reference InputVoltage - (figure1)

V

KA=Vref,IK

= 10mA T

amb

=25oC 2.490 2.500 2.510 2.493 2.500 2.507

V

∆V

ref

Reference InputVoltage Deviation Over
Temperature Range - (figure 1, note1)

V

KA=Vref,IK=

10mA, T

min.

≤ T

amb

≤ T

max.

320 320

mV

∆V

ref

∆T

Temperature Coefficient of Reference Input
Voltage - (note 2)

V

KA=Vref,IK

= 10mA, T

min.

≤ T

amb

≤ T

max.

±13 ±90 ±13 ±90

ppm/

o

C

∆V

ref

∆V

KA

Ratio of Change in Reference Input Voltage to
Change in Cathode to Anode Voltage - (figure 2)

I

K

= 10mA, ∆VKA= 36V to 3V -2 -1.1 -2 -1.1

mV/V

Iref Reference InputCurrent - (figure 2)

I

K

= 10mA, R1= 10kΩ,R2=∞

T

amb

=25oC

T

min.

≤ T

amb

≤ T

max.

1.5 2.5
3

1.5 2.5
3

µA

∆I

ref

Reference InputCurrent Deviation Over
Temperature Range - (figure 2)

I

K

= 10mA, R1= 10kΩ,R2=∞

T

min.

≤ T

amb

≤ T

max.

0.2 1.2 0.2 1.2

µA

I

min

Minimum Cathode Currentfor Regulation - (figure

1)
V

KA=Vref

0.5 1 0.5 0.6

mA

I

off

Off-State Cathode Current - (figure 3) 180 500 180 500 nA

|Z

KA

| Dynamic Impedance - (figure 1, note 3)

V

KA=Vref

, ∆IK= 1 to 100mA, f ≤ 1kHz 0.2 0.5 0.2 0.5

Ω

T1

T2

Temp era ture

V

ref ma x.

V

re fm in.

Notes : 1. ∆V

ref

is defined as thedifference between the maximum and minimum values obtained over the full temperature
range.
∆V

ref=Vref max.-Vref min

2. The temperature coefficientis defined as the slopes (positiveand negative) of the voltage vs temperature limits whithin

which the reference voltage isguaranteed.

3. The dynamic Impedance is defined as |Z

KA

| =

∆V

KA

∆I

K

25 C

Te mpe rature

max

2.5V
min

-

n

p

p

m

/

C

+

n

p

p

m

/

C

TL1431

2/8

ELECTRICALCHARACTERISTICS

T

amb

=25oC (unless otherwise specified)

Symbol Parameter

TL1431I TL1431AI

Unit

Min. Typ. Max. Min. Typ. Max.

V

ref

Reference InputVoltage - (figure1)

V

KA=Vref,IK

= 10mA T

amb

=25oC 2.490 2.500 2.510 2.493 2.500 2.507

V

∆V

ref

Reference InputVoltage Deviation Over
Temperature Range - (figure 1, note1)

V

KA=Vref,IK=

10mA, T

min.

≤ T

amb

≤ T

max.

730 730

mV

∆V

ref

∆T

Temperature Coefficient of Reference Input
Voltage - (note 2)

V

KA=Vref,IK

= 10mA, T

min.

≤ T

amb

≤ T

max.

±22 ±100 ±22 ±100

ppm/

o

C

∆V

ref

∆V

KA

Ratio of Change in Reference Input Voltage to
Change in Cathode to Anode Voltage - (figure 2)

I

K

= 10mA, ∆VKA= 36 to 3V -1.1 -2 -1.1 -2

mV/V

Iref Reference InputCurrent - (figure 2)

I

K

= 10mA, R1= 10kΩ,R2=∞

T

amb

=25oC

T

min.

≤ T

amb

≤ T

max.

1.5 2.5
3

1.5 2.5
3

µA

∆I

ref

Reference InputCurrent Deviation Over
Temperature Range - (figure 2)

I

K

= 10mA, R1= 10kΩ,R2=∞

T

min.

≤ T

amb

≤ T

max.

0.5 1 0.8 1.2

µA

I

min

Minimum Cathode Currentfor Regulation
(figure 1)

V

KA=Vref

0.5 1 0.5 0.7

mA

I

off

Off-State Cathode Current - (figure 3) 180 500 180 500 nA

|Z

KA

| Dynamic Impedance - (figure 1, note 3)

V

KA=Vref

, ∆IK= 1 to 100mA, f ≤ 1kHz 0.2 0.5 0.2 0.5

Ω

T1 T2

Tempera ture

V

re fm ax.

V

ref min.

Notes : 1. ∆V

ref

is defined as thedifference between the maximum and minimum values obtained over the full temperature
range.
∆V

ref

=V

ref max.-Vref min

2. The temperature coefficientis defined as the slopes (positiveand negative) of the voltage vs temperature limits whithin
which the reference voltage isguaranteed.

3. The dynamic Impedance is defined as |Z

KA

| =

∆V

KA

∆I

K

25

C

Te mpe rature

max

2.5V
min

-

n

p

p

m

/

C

+

n

p

p

m

/

C

TL1431

3/8

VKA= V

ref

(1 +

R

1

R

2

)+I

ref

.R1

V

KA

V

ref

Input

I

K

Figure 1 : Test Circuit for VKA=V

ref

V

KA

I

K

V

ref

I

ref

R

R

Input

1

2

Figure2 : Test Circuit for VKA>V

ref

V

KA

Input

I

off

=36V

Figure 3 : Test Circuit for I

off

Input

Vka

Vref

Ik=10mA

Iref

Output

10µF

10µF

15K

8.25K

230

Figure4 : Test Circuit for PhaseMargin and

VoltageGain

TL1431

4/8

Vka=V

ref

Vka=V

ref

Ik= 10mA
V

ka=Vref

= 2.5V

I

k

= 10mA

V

ka=Vref

Ik=10mA
V

ka=Vref

= 2.5V

-40 -20 0 20 40 60 80 100 120

-14

-12

-10

-8

-6

-4

-2

0

Temperature (°C)

Vref drift (mV)

DRIFT (mV) vs TEMPERATURE (oC)

CATHODE CURRENT vs CATHODEVOLTAGE
(detailed version)

-40 -20 0 20 40 60 80 100 120

0

0,02

0,04

0,06

0,08

0,1

Temperature (°C)

Ioff (µA)

OFF-STATE CATHODE CURRENT vs
TEMPERATURE

CATHODE CURRENT vs CATHODE VOLTAGE

-40 -20 0 20 40 60 80 100 120

1

1,2

1,4

1,6

1,8

2

Temperature(°C)

Iref (µA)

REFERENCE CURRENT vs TEMPERATURE

-40 -20 0 20 40 60 80 100 120

-1,6

-1,5

-1,4

-1,3

-1,2

-1,1

-1

-0,9

Temperature (°C)

d(Vref) / d(Vka) (mV/V)

RATIO OF CHANGE IN V

ref

TO CHANGE IN

V

KA

vs TEMPERATURE

TL1431

5/8

Ik=10mA
V

ka=Vref

= 2.5V

I

k=Ikmin.

Vka=V

ref

Ik=10mA

-40 -20 0 20 40 60 80 100 120

-0,04

-0,03

-0,02

-0,01

0

Temperature (°C)

Drift (Ohms)

DRIFT OF RKAvs TEMPERATURE

1 3 10 3 0 1 00 3 00 1,000 3,000 10,000

-200

-100

0

100

200

-40

-30

-20

-10

0

10

20

30

40

50

60

Frequency (KHz)

Phase (°) Gain (dB)

Gain

Phase

PHASE MARGIN vsFREQUENCY

1E-10 1E-9 1E-8 1E-7 0,000001 0,00001

0

20

40

60

80

100

120

Capacitiveloads (F)

Current (mA)

2.5V 5.0V 10V 15 V 20V 28 V

STABILITY FOR CAPACITIVE LOADS

-40 -20 0 20 40 60 80 100 120

0,4

0,42

0,44

0,46

0,48

0,5

0,52

Temperature (°C)

Imin (mA)

MINIMUMOPERATING CURRENT vs
TEMPERATURE

TL1431

6/8

PACKAGE MECHANICAL DATA

8 PINS - BATWING PLASTICMICROPACKAGE(SO)

Dimensions

Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

A 1.75 0.069
a1 0.1 0.25 0.004 0.010
a2 1.65 0.065
a3 0.65 0.85 0.026 0.033

b 0.35 0.48 0.014 0.019
b1 0.19 0.25 0.007 0.010

C 0.25 0.5 0.010 0.020
c1 45

o

(typ.)
D 4.8 5.0 0.189 0.197
E 5.8 6.2 0.228 0.244
e 1.27 0.050

e3 3.81 0.150

F 3.8 4.0 0.150 0.157
L 0.4 1.27 0.016 0.050

M 0.6 0.024

S8

o

(max.)

TL1431

7/8

PACKAGE MECHANICAL DATA

3 PINS - PLASTIC PACKAGETO92

Dimensions

Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

L 1.27 0.05
B 3.2 3.7 4.2 0.126 0.1457 0.1654

O1 4.45 5.00 5.2 0.1752 0.1969 0.2047

C 4.58 5.03 5.33 0.1803 0.198 0.2098
K 12.7 0.5

O2 0.407 0.5 0.508 0.016 0.0197 0.02

a 0.35 0.0138

Informationfurnished isbelievedto be accurate andreliable.However, SGS-THOMSON Microelectronicsassumes no responsibility
for the consequences of use of such information nor for anyinfringement of patents or other rights of third parties which mayresult
from its use. No licenseis granted byimplication or otherwiseunder any patent or patent rights of SGS-THOMSONMicroelectronics.
Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
informationpreviouslysupplied. SGS-THOMSON Microelectronics products are not authorized for useascriticalcomponents in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.

 1998 SGS-THOMSON Microelectronics – Printed in Italy– AllRights Reserved

SGS-THOMSON Microelectronics GROUP OF COMPANIES

Australia- Brazil - Canada - China - France -Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco

The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.

TL1431

8/8