Datasheet CL2431VS, CL2431IVS, CL2431IAVS, CL2431AVS Datasheet (Calogic LLC)

Precision Adjustable
Shunt Reference

CL2431

CORPORATION

FEATURES

•• T emperatur e- Co m p ensated: 30ppm/

o

C

•• Trimmed 0.5% Bandgap Reference

•• Internal Amplifier with 100mA Capability

•• T empe rature Range: Extended to 0 to 105

o

C

•• Low Frequenc y Dynami c Output Imp edan ce: < 150mΩ

•• Low Output Noise

•• SOT-23 Replacement for TL431

PIN CONFIGU R ATIO N (Top View)

DESCRIPTION

The CL2431 is a three terminal adjustable voltage reference
designed to act as an open-loop error amplifier with a 2.5V
temperature compensated reference. Operating as a low
temperature coefficient zener which is programmable from

to 18V with two external resistors while providing a wide

V

REF

operating current range of 1.0mA to 100mA with a typical
dynamic impedance of 0.15Ω. As a shunt regulator the
device can be used as either a positive or negative voltage
reference. Active output circuitry provides a very sharp
turn-on characteristic, making the CL2431 an excellent
replacement for low-voltage zener diodes in many
applications, including on-board regulation and adjustable
power supplies.

ORDERING INFORMATION
Part Package Tolerance Temperature Range

o

CL2431VS SOT-23 1.0% 0 to +105
CL2431A V S SOT-23 0.5% 0 to +105
CL2431IVS SOT-23 1.0% -40 to +85
CL2431IAVS SOT-23 0.5% -40 to +85

C

o

C

o

C

o

C

SOT-23 (VS)

CATHODE

ANODE

REFERENCE

1J-22

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

CORPORATION

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNITS

CL2431

V
I
I
I
P

KA

AK

KA

REF

D

Cathode-Anode Reverse Breakdown 18 V
Anode-Cathode Forward Current 1 A
Operating Cathode Current 100 mA
Reference Inp ut Current 1 mA
Continuous Power Dissipation at 25oC

SOT-23 200 mW

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

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

o

C

o

C

o

C

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 Voltage V

to 18 V

REF

Cathode Current 10 mA

TYPICAL THERMAL RESISTANCES

PACKAGE θ

SOT-23 575

JA

o

C/W 150oC/W 1.7mW/oC

θ

JC

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, Telephone: [phone], FAX: [phone]

CL2431

CORPORATION

ELECTRICAL CHARACTERISTICS

Electrica l characte ri stics are gua ran te ed over full junction temp erature range (0 to 105oC). Ambient temperature must be derated based on
power dissipation and package thermal characteristics. The conditions are: VKA = V

SYMBOL PARAMETER MIN TYP MAX UNIT 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
Min IK for Regulation 0.4 1 mA 1
Off State Leakage 0.04 25 0 n A 3 V
Dynamic Output Impedance 0.15 0.5 Ω 1f ≤ 1kHz, IK = 1 to 100mA

with Temp.* 0.6 0.2 mV/oC1

REF

to

REF

Temp Deviation 0.4 1.2 µA 2 Over Temp.

REF

2.490 2.500 2.515 V 1 T

2.470 2.500 2.520 V 1 TA = 25

–2.7 –1.01

–2 –0.4 0.3 10V to 18V

and IK = 10mA unless otherwise stated.

REF

= 25oC, 0.5% CL2431A

A

to 10V

V

mV/V 2

REF

= 0V, VKA = 18V

REF

o

C, 1.0% CL2431

*CALCULAT ING AVERAGE TEMPERATURE COEFFICIENT (TC)

%

–10

mV

∆T

–5

0

15 30 45 60 75 90 105

TEMPERATURE (˚C)

0.019 mV/˚C

0.001 %/˚C

7.6 ppm/˚C

∆V

REF

1J-28

ppm

000

0.22000

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, Telephone: [phone], FAX: [phone]

CORPORATION

TYPICAL PERFORMANCE CU R VES

CL2431

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

CURRENT (nA)

– OFF STATE CATHODEI

0.1

off

Z

0.01
–60

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= 18V
V

= 0V

REF

–30

0

30 60 90 120

– AMBIENT TEMPERATURE (˚ C)

T

A

1G-41

1P-43

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

TEMPERATURE COEFFICIENT AS

A FUNCTION OF TRIM VALUE

2.53
VKA= V

2.52

2.51

2.50

2.49

2.48

2.47

– REFERENCE VOLTAGE (V)

2.46

REF

V

2.45

–60

REF

IK= 10mA

V

REF

–30
– AMBIENT TEMPERATURE (˚C)T

A

= 2.500V AT 25˚C

0 306090120

210–1

1G-42

1J-29

REFERENCE VOLTAGE

0

LINE REGULATION

–55˚C

0˚C

25˚C

IK= 10mA

TEMPERATURE RANGE: –55 to 125˚C

369121518

0

– CATHODE VOLTAGE (V)V

KA

75˚C

125˚C

1J-30

– REFERENCE INPUTI

REF

REFERENCE

3.0

2.5

2.0

1.5

1.0

CURRENT (µA)

0.5

0
–60

INPUT CURRENT

R1 = 10kΩ
R2 = ∞

= 10mA

I

K

–30 0 306090120

TA– AMBIENT TEMPERATURE (˚C)

1G-45

–10

–20

–30

VOLTAGE (mV)

– CHANGE IN REFERENCEV

–40

REF

–50

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

CL2431

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

CORPORATION

1G-48

100

10

1.0

0.1

– DYNAMIC IMPEDANCE (Ω)

KA

Z

0.01
1k

SMALL SIGNAL VOLTAGE GAIN

70

60

50

40

vs FREQUENCY

TEMPERATURE RANGE: –55 to 125˚C

IK= 10mA

DYNAMIC OUTPUT

IMPEDANCE

TA= 25˚C

= 1 TO 100mAI

K

f – FREQUENCY (Hz)

9µF

10M

15k

1G-49

OUT

I

K

230Ω

1M100k10k

GAIN (dB)

– SMALL SIGNAL VOLTAGEA

V

30

20

10

0

1k

1M100k10k

f – FREQUENCY (Hz)

10M

1J-31

8.25k
GND

1H-01

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

CORPORATION

1H-03

GND

OUT

220

Ω

INPUT

MONITOR

50

Ω

fP= 100kHz

TYPICAL PERFORMANCE CU R VES (cont in ued)

CL2431

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, Telephone: [phone], FAX: [phone]