Datasheet CL431S, CL431LP, CL431D Datasheet (Calogic LLC)

CORPORATION

Precision Adjustable

Shunt Reference

CL431

FEATURES

•• Trimmed 0.5% 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)

DESCRIPTION

o

C

The CL431 is an adjustable shunt regulat or designed t o act as
an open-loop error amplifier with a 2.5V temperature
compensated reference. Its highly accurate 0.5% bandgap
reference is perfect for applications requiring stability and
accuracy over temp er atur e and life.

Sharp turn-on characteristics and a low temperature
coefficient make the CL431 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 contr ol loops suc h a s s w itchin g p ower
supplies.

The CL431 can be used as a direct replacement for the
standard TL431.

ORDERING INFORMATION
Part Package Temperature Range

o

CL431LP TO-92 0 to 105
CL431D 8-Pin Plastic SOI C 0 to 105
CL431S SOT-89 0 to 105

C

o

C

o

C

TO-92 (LP)

CATHODE

ANODE

REFERENCE

1G-33

CATHODE

ANODE

ANODE

N/C

SOIC (D)

1

2

3

4

8

REFERENCE

7

ANODE

6

ANODE

5

N/C

1G-34

SOT-89 (S)

CATHODE

ANODE

REFERENCE

1G-35

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

CL431

CORPORATION

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNITS

V

KA

I

AK

I

KA

I

REF

P

D

T

J

T

STG

T

L

Exceeding ABSOLUTE MAXIM UM RATINGS may cause perm anen t damage. Extende d operat ion of the device at these or any other conditions
above those indicated in the operational sections of this specification is not recommended as it may adversely affect reliability and performance.

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]

CL431

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

V

REF

TC ∆V
∆V

REF

∆V

K

I

REF

∆I

REF

I

K(MIN)

I

K(OFF)

Z

KA

Reference Voltage

with Temp.* 0.07 0.20 mV/oC1

REF

Ratio of Change in V
Cathode Voltage

Reference Input Current 0.7 4 µA2
I

Temp Deviation 0.4 1.2 µA 2 Over Temp.

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

REF

to

CL431 (0.5%)

MIN TYP MAX

2.490 2.503 2.515 V 1 T

2.469 2.536 V 1 Over Temp.

–2.7 –1.0

–2 –0.4 0.3 10V to 36V

KA

= V

and IK = 10mA unless otherwise stated.

REF

UNIT

TEST

CIRCUIT

mV/V 2

TEST CONDITION

= 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



REF

∆T

∆V

REF

at 25oC

∆T

V

I

K(OFF)

o

C

A

KA



x 100






x 10




A

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]

CL431

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

CL431

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

TA= 25˚C

10

1k

DYNAMIC OUTPUT

IMPEDANCE

= 1 TO 100mAI

K

f – FREQUENCY (Hz)

9µF

10M

15k

1G-49

OUT

I

K

230Ω

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]

CL431

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]