Diodes AZ431L User Manual

AZ431L

Document number: DS36801 Rev. 3 - 2

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January 2014

© Diodes Incorporated

AZ431L

A Product Line of

Diodes Incorporated

Description

The AZ431L series ICs are low voltage three-terminal adjustable
regulators with guaranteed thermal stability over a full operation
range. These ICs feature sharp turn-on characteristics, low
temperature coefficient and low output impedance, which make them
ideal substitutes for Zener diodes in applications such as switching
power supply, charger, motherboard and other adjustable regulators.

The output voltage can be set to any value between 1.24V and 18V
with two external resistors.

The AZ431L precision reference is offered in two voltage tolerance:

0.5% and 1.0%.

These ICs are available in 4 packages: TO-92 (bulk or ammo
packing), SOT-23, SOT-23-5 and SOT-89.

Features

 Wide Programmable Precise Output Voltage from 1.24V to 18V
 High Stability under Capacitive Load
 Low Temperature Deviation: 3mV Typical
 Low Equivalent Full-range Temperature Coefficient: 20PPM/oC

Typical

 Low Dynamic Output Resistance: 0.05Ω Typical
 High Sink Current Capacity from 0.1mA to 100mA
 Low Output Noise
 Wide Operating Range of -40 to +125oC

Applications

 Graphic Card
 PC Motherboard
 Voltage Adapter
 Switching Power Supply
 Charger

1

2

3

CATHODE

ANODE

REF

CATHODE

ANODE

REF

3

2

1

CATHODE

ANODE

REF

1

2

3

LOW VOLTAGE (1.24V) ADJUSTABLE PRECISION SHUNT REGULATOR

Pin Assignments

(TO-92 (Bulk Packing)/ Z Package) (TO-92 (Ammo Packing)/ Z Package) (SOT-23/ N Package)

(Top View) (Top View) (Top View)

AZ431L

Document number: DS36801 Rev. 3 - 2

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January 2014

© Diodes Incorporated

AZ431L

A Product Line of

Diodes Incorporated

CATHODE

ANODE

REF

1

2

3

4

5NC

*

(Note 1)

1 2 3

REF ANODE CATHODE

1 2

3

REF ANODE CATHODE

Pin Assignments (Cont.)

(Top View) (Top View) (Top View)

(SOT-23-5/ K Package) (SOT-89 Option 1/ R Package) (SOT-89 Option 2/ R Package)

Note 1: *Pin 2 is attached to substrate and must be connected to ANODE or open.

Typical Applications Circuit

Shunt Regulator

High Current Shunt Regulator

AZ431L

Document number: DS36801 Rev. 3 - 2

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www.diodes.com

January 2014

© Diodes Incorporated

AZ431L

A Product Line of

Diodes Incorporated

Typical Applications Circuit (Cont.)

Current Source or Current Limit

Precision 5V 1A Regulator

PWM Converter with Reference

AZ431L

Document number: DS36801 Rev. 3 - 2

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AZ431L

A Product Line of

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Symbol

Parameter

Rating

Unit

VKA

Cathode Voltage

20

V

I

KA

Cathode Current Range (Continuous)

-100 to 100

mA

I

REF

Reference Input Current Range

10

mA

P

D

Power Dissipation

Z, R Package

770

mW

N, K Package

370

TJ

Junction Temperature

+150

ºC

T

STG

Storage Temperature Range

-65 to +150

ºC

Symbol

Parameter

Min

Max

Unit

V

KA

Cathode Voltage

V

REF

18

V

I

KA

Cathode Current

0.1

100

mA

–

Operating Ambient Temperature Range

-40

+125

ºC

Functional Block Diagram

Absolute Maximum Ratings (Note 2)

Note 2: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to
“Absolute Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

AZ431L

Document number: DS36801 Rev. 3 - 2

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January 2014

© Diodes Incorporated

AZ431L

A Product Line of

Diodes Incorporated

Symbol

Parameter

Test

Circuit

Conditions

Min

Typ

Max

Unit

V

REF

Reference Voltage

0.5%

4

V

KA

= V

REF

, I

KA

= 10mA

1.234

1.240

1.246

V

1.0%

1.228

1.240

1.252

∆V

REF

Deviation of Reference Voltage
Over Full Temperature Range

4

V

KA

= V

REF

,

I

KA

= 10mA

0 to +70°C

– 2 10

mV

-40 to +85°C

– 3 10

-40 to +125°C

– 4 15

∆V

REF

∆VKA

Ratio of Change in V

REF

to the

Change in Cathode Voltage

5

I

KA

= 10mA,

∆VKA: V

REF

to 16V

–

-0.5

-1.5

mV/V

I

REF

Reference Input Current

5

I

KA

= 10mA, R1 = 10KΩ, R2 = ∞

–

0.15

0.4

µA

∆I

REF

Deviation of Reference Current
Over Full Temperature Range

5

I

KA

= 10mA, R1 = 10KΩ, R2 = ∞,

TA = -40 to +125°C

–

0.1

0.4

µA

I

KA

(Min)

Minimum Cathode Current for
Regulation

4

V

KA

= V

REF

–

55

80

µA

I

KA

(Off)

Off-state Cathode Current

6

V

REF

= 0, V

KA

= 18V

–

0.04

0.10

µA

V

KA

= 6, V

REF

= 0

–

0.01

0.05

Z

KA

Dynamic Impedance

4

V

KA

= V

REF

, IKA = 1 to 100mA,

f ≤ 1.0KHz

–

0.05

0.15

Ω

θ

JC

Thermal Resistance

–

SOT-23

–

84.84

–

°C/W

SOT-23-5

–

84.84

–

TO-92

–

140.80

–

SOT-89

–

29.80

–

Electrical Characteristics (Operating Conditions: T

= +25 ºC, unless otherwise noted.)

A

AZ431L

Document number: DS36801 Rev. 3 - 2

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January 2014

© Diodes Incorporated

AZ431L

A Product Line of

Diodes Incorporated

Electrical Characteristics (Cont.)

Test Circuit 4 for V

KA

= V

REF

Test Circuit 5 for V

Test Circuit 6 for I

> V

REF

KA

OFF