Datasheet TL431D, TL431S, TL431LP Datasheet (Calogic)

CORPORATION

Precision Adjustable

Shunt Reference

TL431

FEATURES

•• Trimmed 1% Bandgap Reference

•• Nominal Temperat ur e Range Extended to 105

•• Temperature-Compensated: 30ppm/

o

C

•• Internal Amplifier w it h 150mA C a pability

•• Low Output Noise

•• Low Frequency Dynam ic Output Imp edan ce

PIN CONFIGU R ATI O N (Top View)

TO-92 (LP)

CATHODE

ANODE

CATHODE

ANODE

ANODE

DESCRIPTION

o

C

The TL431 is an adjustable shunt regulator designed to ac t as
an open-loop error amplifier with a 2.5V temperature
compensated reference. Its highly accurate 1% bandgap
reference is perfect for applications requiring stability and
accuracy over temp er atur e and life.

Sharp turn-on cha racteristics and a low temperature coefficient
make the TL431 an excellent replacement for many zener
diode applications, programmable to any value greater than

2.5V and up to 36V by using two external resistors. As a
combination error amplifier and reference, it can be used to
manage control loops such as sw itchin g power sup plies.

ORDERING INFORMATION
Part Package Temperature Range

o

TL431LP TO-92 0 to 105
TL431D 8-Pin Plastc SOIC 0 to 105
TL431S SOT-89 0 to 105

SOIC (D)

1

2

3

8

REFERENCE

7

ANODE

6

ANODE

SOT-89 (S)

CATHODE

ANODE

C

o

C

o

C

REFERENCE

1G-33

N/C

4

5

N/C

1G-34

REFERENCE

1G-35

CALOG IC CORPOR AT ION, 237 Whitney Place, Fremont, California 94539, Telephone: [phone], FAX: [phone]

TL431

CORPORATION

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNITS

V

KA

I

AK

I

KA

I

REF

P

D

T

J

T

STG

T

L

Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permane nt damag e to the device. This is a stress r ating
only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification
is not implied. Exposure to ab solut e ma ximu m rati ng conditi on s for ext ende d peri od s may affe ct reliab ili ty.

RECOMMENDED CONDITIONS

SYMBOL P ARAMETER RATING UNIT

V

KA

I

K

Cathode-Anode Reverse Breakdown 37 V
Anode-Cathode Forward Current 1 A
Operating Cathode Current 250 mA
Reference Inp ut Current 10 mA
Continuou s Power at 25oC

TO-92
8L SOIC
SOT-89

775
750

1000
Junction Temperature 150
Storage Temperature –65 to 150
Lead Temperature, Soldering 10 Seconds 300

TYPICAL THERMAL RESISTANCE

Cathode Voltage V

to 20 V

REF

Cathode Current 10 mA

PACKAGE θ

TO-92 160
SOIC 175
SOT-89 110

JA

o

C/W 80oC/W 6.3mW/oC

o

C/W 45oC/W 5.7mW/oC

o

C/W 8oC/W 9.1mW/oC

θ

JC

mW
mW
mW

o

C

o

C

o

C

TYPICAL DERATING

FUNCTIONAL BLOCK DIAGRAM

CATHODE (K)

REFERENCE (R)

+
–

2.5V

ANODE (A)

1G-36

CALOG IC CORPOR ATION, 237 Whitney Place, Fremont, California 94539, T elephone: 510-656-2900, FAX: [phone]

TL431

CORPORATION

ELECTRICAL CHARACTERISTICS

Electrical Charact eristics are guarant ee d over full junct ion tempe ratu re ran ge (0 to 105oC). Ambient tempera ture must be derated based on
power dissipation and package thermal characteristics. The conditions are: V

SYMBOL PARAMETER MIN TYP MAX UNIT TEST CIRCUIT TEST CONDITION

V

REF

Reference Voltage

TC ∆V

∆V

∆V

I

REF

∆I

REF

I

K(MIN)

I

K(OFF)

Z

KA

REF

K

Ratio of Change in V
Cathode Voltage

Reference Input Current 0.7 4 µA2
I

REF

Min IK for Regulation 0.4 1 mA 1
Off State Leakage 0.04 250 nA 3 V
Dynamic Output Impedance 0.15 0.5 Ω 1f ≤ 1kHz, IK = 1 to 150mA

with Temp.* 0.07 0.20 mV/oC1

REF

to

REF

T emp Deviation 0.4 1.2 µA 2 Over Temp.

2.470 2.495 2.520 V 1 T

2.449 2.541 V 1 Over Temp.

–2.7 –1.0

–2 – 0.4 0. 3 10V to 36V

= V

KA

REF

mV/V 2

and IK = 10mA unless otherwise stated.

= 25oC

A

V

to 10V

REF

= 0V, VKA = 36V

REF

*CALCULAT ING AVERAGE TEMPERATURE COEFFICIENT (TC)

%

ppm

000

0.55000

mV

∆V

REF

∆T

–10

0 15 30 45 60 75 90 105

TEMPERATURE (˚C)

0.07 mV/˚C

0.003 %/˚C
27 ppm/˚C

1G-37

TEST CIRCUITS

V

V

IN

I

REF

V

= V

KA

REF

I

K

IN

R

(V )

REF

R

1

I

REF

2

∆V

(mV)

• TC in mV/oC =

• TC in %/oC =

• TC in ppm/oC =

V

KA

I

K

V

IN

REF

∆T

A

∆V

REF




V

at 25



REF

∆V




V



REF




o

C



∆T

A

REF

at 25oC

∆T

A

V

KA

I

K(OFF)

x 100



x 10




6

1G-38

1G-39

1G-40

TEST CIRCUIT 1 TEST CIRCUIT 2 TEST CIRCUIT 3

CALOG IC CORPOR ATION, 237 Whitney Place, Fremont, California 94539, T elephone: 510-656-2900, FAX: [phone]

TL431

2.54

2.46
–60

1G-44

TEMPERATURE COEFFICIENT AS

A FUNCTION OF TRIM VALUE

–30

2.47

2.48

2.49

2.50

2.51

2.52

2.53

0

30 60 90 120

V

REF

– REFERENCE VOLTAGE (V)

– AMBIENT TEMPERATURET

A

V

KA

= V

REF

I

K

= 10mA

V

REF

= 2.503V AT 25˚C

TYPICAL PERFORMANCE CU R VES

CORPORATION

LOW CURRENT OPERATING

900
800
700
600
500
400
300
200
100

– CATHODE CURRENT (µA)

0

K

I

–100
–200

–1.0 3.0

100

10

1

CHARACTERISTICS

V= V

REFKA

TEMPERATURE RANGE: –55 to 125˚C

125˚C

25˚C

–55˚C

1.00 2.0

VKA– CATHODE VOLTAGE (V)

OFF STATE LEAKAGE

VKA= 36V

= 0V

V

REF

1G-41

HIGH CURRENT OPERATING

CHARACTERISTICS

VKA= V

REF

TEMPERATURE RANGE: –55 to 125˚C

–2 3

– CATHODE VOLTAGE (V)V

KA

– CATHODE CURRENT (mA)

I

K

150
125
100

75
50
25

0
–25
–50
–75

–100

210–1

1G-42

CURRENT (nA)

– OFF STATE CATHODEI

0.1

off

Z

0.01
–30 0 306090120

–60

– AMBIENT TEMPERATURE (˚C)T

A

3.0
R1 = 10kΩ

R2 = ∞

2.5

I

K

2.0

1.5

1.0

CURRENT (µA)

– REFERENCE INPUTI

REF

0.5

0

–60

TA– AMBIENT TEMPERATURE (˚C)

= 10mA

–30 0 306090120

REFERENCE

INPUT CURRENT

1G-43

1G-45

0

–10

–20

–30

VOLTAGE (mV)

– CHANGE IN REFERENCEV

–40

REF

IK= 10mA

TEMPERATURE RANGE: –55 to 125˚C

–50

030

REFERENCE VOLTAGE

LINE REGULATION

–55˚C

0˚C

25˚C

75˚C

125˚C

3 6 9 12 15 18 21 24 27

– CATHODE VOLTAGE (V)V

KA

1G-46

CALOG IC CORPOR ATION, 237 Whitney Place, Fremont, California 94539, T elephone: 510-656-2900, FAX: [phone]

CORPORATION

TYPICAL PERFORMANCE CU R VES (cont in ued)

NOISE VOLTAGE

VKA= V

REF

I

= 10mA

K

= 25˚C

T

A

f – FREQUENCY (Hz)

10k1k100

NOISE VOLTAGE nV/ Hz

70

60

50

40

30

20

10

0

10

100k

1G-47

– DYNAMIC IMPEDANCE (Ω)

KA

Z

LOW FREQUENCY DYNAMIC

0.150

0.125

0.100

0.075

0.050

0.025

0.0

OUTPUT IMPEDANCE

VKA= V

REF

= 1 TO 100mA

I

KA

f ≤ 1kHz

–30 0 306090120

–60

– FREE AIR TEMPERATURET

A

TL431

1G-48

70

60

50

40

100

1.0

0.1

– DYNAMIC IMPEDANCE (Ω)

KA

Z

0.01

SMALL SIGNAL GAIN

vs FREQUENCY

TA= 25˚ C

= 10mA

I

K

10

1k

DYNAMIC OUTPUT

IMPEDANCE

TA= 25˚C

= 1 TO 100mAI

K

f – FREQUENCY (Hz)

9µF

10M

15k

1G-49

OUT

I

230Ω

K

1M100k10k

GAIN (dB)

– SMALL SIGNAL VOLTAGE

V

A

30

20

10

8.25k
GND

1H-01

0

1k

100k10k

f – FREQUENCY (Hz)

1M

10M

1G-50

CALOG IC CORPOR ATION, 237 Whitney Place, Fremont, California 94539, T elephone: 510-656-2900, FAX: [phone]

TL431

1H-03

GND

OUT

220

Ω

INPUT

MONITOR

50

Ω

fP= 100kHz

TYPICAL PERFORMANCE CU R VES (cont in ued)

CORPORATION

6

PULSE RESPONSE

INPUT

5

4

3

OUTPUT

2

1

0

INPUT AND OUTPUT VOLTAGES (V)

–1

0

t – TIME (µs)

STABILITY BOUNDARY

100

A: VKA= V

B: VKA= 5V AT IK= 10mA

90

C: V

80

D: V

70
60
50
40
30
20

– CATHODE CURRENT (mA)

K

I

10

TA= 25˚C

0

10 10

CONDITIONS

REF

= 10V AT IK= 10mA

KA

= 15V AT IK= 10mA

KA

STABILITY

REGION

– LOAD CAPACITANCE (pF)C

L

A
B

D

121234567891011

1H-02

150Ω

I

K

C

C

L

10k

1H-05

7

6543210

101010101010

1H-04

CALOG IC CORPOR ATION, 237 Whitney Place, Fremont, California 94539, T elephone: 510-656-2900, FAX: [phone]