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Adjustable Precision

Shunt Regulator

Description

The

CYT432

is a low voltage three terminal

adjustable shunt regulator with a guaranteed thermal

stability over applicable temperature ranges. The output

voltage can be set to any value between V

REF

(approximately 1.24 V) to 12V with two external resistors.

This device has a typical output impedance of 0.25Ω.

Active output circuitry provides a very sharp turn on

characteristic, making this device excellent replacement

for Zener diodes in many applications.

The

CYT432

is characterized for operation from 0

o

C

to

105

o

C,

and

four

package

options

(SOT-23-3,

CYT432

Features

Low voltage operation (1.24V)

Adjustable output voltage V

0

=V

REF

to 12V

Wide operating current range 60µA to 100mA

Low dynamic output impedance 0.25Ω (Typ.)

Trimmed bandgap design up to + 0.5%.

ESD rating is 4KV(Per MIL-STD-883D)

Available in Lead-Free Packages.

Application

Linear Regulators

Adjustable Supplies

Switching Power Supplies

Battery Operated Computers

Instrumentation

Computer Disk Drives

SOT-23-5, TO-92 and SOP-8) allow the designer the

opportunity to select the proper package for their

applications.

Pin Configuration

SOT-23-3, SC59-3L

(Top View)

SOT-23-5L

(Top View)

SOP-8

(Top View)

TO-92

(Top View)

Marking Information

Package

SOT-23-3

SC59-3L

Marking

CYT

432W

Production Year Code

Starting with S, a bar on top of S is for production

year 2001, and underlined S is for year 2002.

The next character is marked on top for 2003, and

Production Week Code

Lead-Free Package

Lead-free package is

indicated by a dot on

top of the week code.

A-Z: 1-26

a-z: 27-52

SOT-23-5L

CYT

432W

CYT432

YYWW

CYT432

YYWW

underlined for 2004. The naming pattern continues

with consecutive characters for later years.

SOP-8

WW is for the week of

YY is for the year of production. 04 means

the product is manufactured in year of 2004.

production.

26 means the

Lead-free

package

is

TO-92

product is manufactured in

the 26

th

week

indicated by LF after

YYWW.

All contents are subject to change without prior notice.

1

Adjustable Precision

Shunt Regulator

Absolute Maximum Rating

Parameter

Cathode Voltage

Continuous Cathode Current

Reference Current

Operating Junction Temperature Range

Storage Temperature Range

Symbol

V

KA

I

KA

I

REF

T

J

T

STG

Maximum

12

150

3

150

-45 to 150

230 (SOT-23-3)

Thermal Resistance

θ

JA

230 (SOT-23-5)

150 (SOP-8)

220 (TO-92)

Lead Temperature (Soldering) 10 seconds

T

LEAD

260

CYT432

Units

V

mA

°C

°C/W

°C

Electrical Characteristics

Parameter

1.250V ± 0.5%

Reference

Voltage

1.240V ± 0.5%

1.240V ± 1.0%

1.240V ± 1.5%

1.240V ± 2.0%

Deviation of Reference Voltage over

Full Temperature Range

Ratio of Change in Reference Voltage

to the Change in Cathode Voltage

Reference Current

Test circuit #1

V

I(DEV)

V

KA

= V

REF

, I

KA

= 10mA,

T

A

= 0°C - 105°C

∆V

REF

/∆VKA

Test circuit #2

I

KA

= 10mA,

∆V

KA

= 12V to V

REF

Test circuit #2

I

KA

= 10mA, R1=10kΩ, R2 =

∞

Test circuit #2

I

I(DEV)

I

KA

= 10mA, R1=10kΩ, R2 =

∞

T

A

= 0°C - 105°C

I

MIN

Test circuit #1

V

KA

= V

REF

Test circuit #3

V

KA

= 12V, V

REF

= 0

Test circuit #1

Dynamic Impedance

| Z

KA

|

I

KA

= 100µA - 80mA,

V

KA

= V

REF

, f

≤

1kHZ

--

0.25

1

Ω

--

60

100

µA

--

0.10

0.50

µA

--

-1.0

-2.7

mV/V

--

10

25

mV

V

REF

Test circuit #1

V

KA

= V

REF

, I

KA

= 10mA

Symbol

Test Conditions & Circuit

Min

1246

1234

1228

1221

1215

Typ

1250

1240

Max

1256

1246

1252

1259

1265

mV

Unit

I

REF

--

0.15

2

µA

Deviation of Reference Current over

Full Temperature Range

Minimum Cathode Current for

Regulation

Off-state Cathode Current

I

OFF

--

0.04

0.8

µA

All contents are subject to change without prior notice.

2

Adjustable Precision

Shunt Regulator

Typical Performance Characteristics

Cathode Current VS Cathode

Voltage

150

125

Cathode Current (mA)

100

75

50

25

0

-25

-50

-75

-100

-2

-1

0

1

2

Cathode Voltage (V)

VKA = Vref

TA = 25C

CYT432

Cathode Current VS Cathode

Voltage

500

400

Cathode Current (uA)

300

200

100

0

-100

-200

-1

0

1

2

Cathode Voltage (V)

VKA = Vref

TA = 25C

Reference Voltage VS Junction

Temperature

1260

Reference Input Current VS Junction Temperature

1000

R1 = 10k

Ω

R2 =

∞

I

KA

=10mA

Reference Current (nA)

120

Reference Voltage (mV)

1250

1240

1230

1220

1210

1200

-20

0

20

40

60

800

Iz=10mA

600

Iz=60µA

400

200

80

100

Junction Temperature (C)

0

- 20

0

20

40

60

80

100

120

Junction Temperature (C)

All contents are subject to change without prior notice.

3

Adjustable Precision

Shunt Regulator

Stability Boundary Condition

100

CYT432

80

IKA (mA)

60

40

20

0

0.001

0.01

0.1

1

CL (uF)

VKA=VREF (1.24V)

VKA=2V

VKA=3V

The areas under the curves represent conditions that may cause the device to oscillate. For V

KA

= 2V

and 3V curves, R2 and V

BAT

were adjusted to establish the initial V

KA

and I

K

conditions with CL = 0. V

BAT

and

C

L

then were adjusted to determine the ranges of stability. As the graph suggested,

CYT432

is unconditional

stable with I

K

from 0 to 100mA and with C

L

from 0.001uF to 1uF.

All contents are subject to change without prior notice.

4

Adjustable Precision

Shunt Regulator

Symbol Diagram

Cathode

Ref

CYT432

Block Diagram

Cathode

+

-

Ref

Vref

Anode

Test Circuits

Input

V

KA

Input

V

KA

Input

V

KA

I

KA

I

KA

I

off

R1

Iref

Vref

R2

Vref

R1

V

KA

= Vref (1+

) + Iref x R1

R2

Test Circuit 1:

V

KA

= V

REF

Test Circuit 2:

V

KA

> V

REF

Test Circuit 3:

Off State Current

Application Circuit

V

IN

R

V

OUT

R1

Vref

R2

CYT432

V

OUT

= Vref (1+

R1

)

R2

GND

All contents are subject to change without prior notice.

5

CYT432

CYT432概述

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