A Product Line of

Diodes Incorporated

AS431

ADJUSTABLE PRECISION SHUNT REGULATORS

Description

The AS431 is a three-terminal adjustable shunt regulator with

guaranteed thermal stability over a full operation range. It features

sharp turn-on characteristics, low temperature coefficient and low

output impedance, which make it ideal substitute for Zener diode in

applications such as switching power supply, charger and other

adjustable regulators.

The output voltage of AS431 can be set to any value between VREF

(2.5V) and the corresponding maximum cathode voltage (36V).

The AS431 precision reference is offered in two voltage tolerance:

0.5% and 1.0%.

This IC is available in 4 packages: TO-92 (bulk or ammo packing),

SOT-23, SOT-23-5 and SOT-89.

Features



Programmable Precise Output Voltage from 2.5V to 36V

High Stability under Capacitive Load

Low Temperature Deviation: 4.5mV Typical

Low Equivalent Full-range Temperature Coefficient with

20PPM/°C Typical

Sink Current Capacity from 1mA to 100mA

Low Output Noise

Wide Operating Range of -40 to +125°C

Lead-Free Packages: SOT-23, SOT-23-5, TO-92, SOT-89



Totally Lead-Free; RoHS Compliant (Notes 1 & 2)

Lead-Free Packages, Available in “Green” Molding Compound:

SOT-23, SOT-23-5, TO-92, SOT-89



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)

Applications



Charger

Voltage Adapter

Switching Power Supply

Graphic Card

Precision Voltage Reference

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Notes:

Pin Assignments

N Package

(SOT-23)

R Package

(SOT-89 Option 1)

R Package

(SOT-89 Option 2)

1

REF

2

3

1

REF

2

3

ANODE CATHODE

K Package

(SOT-23-5)

Z Package

(TO-92 (Bulk Packing))

Z Package

(TO-92 (Ammo Packing

))

3

CATHODE

2

ANODE

1

REF

Note:

4. * Pin 2 is attached to substrate and must be connected to ANODE or open.

AS431

Document number: DS36599 Rev. 3 - 2

1 of 19

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October 2013

A Product Line of

Diodes Incorporated

AS431

Typical Applications Circuit

Shunt Regulator

High Current Shunt Regulator

AS431

Document number: DS36599 Rev. 3 - 2

2 of 19

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October 2013

A Product Line of

Diodes Incorporated

AS431

Typical Applications Circuit

(Cont.)

Current Source or Current Limit

Precision 5V 1A Regulator

PWM Converter with Reference

AS431

Document number: DS36599 Rev. 3 - 2

3 of 19

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October 2013

A Product Line of

Diodes Incorporated

AS431

Functional Block Diagram

Absolute Maximum Ratings

(Note 5)

Symbol

V

KA

I

KA

I

REF

P

D

T

J

T

STG

ESD

Note 5:

Parameter

Cathode Voltage

Cathode Current Range (Continuous)

Reference Input Current Range

Power Dissipation

Junction Temperature

Storage Temperature Range

ESD (Human Body Model)

Rating

40

-100 to 150

10

Z, R Package

N, K Package

+150

-65 to +150

2000

770

370

Unit

V

mA

mW

°C

V

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

Symbol

V

KA

I

KA

T

A

Parameter

Cathode Voltage

Cathode Current

Operating Ambient Temperature Range

Min

V

REF

1.0

-40

Max

36

100

+125

Unit

V

mA

°C

AS431

Document number: DS36599 Rev. 3 - 2

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October 2013

A Product Line of

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AS431

Electrical Characteristics

(Operating Conditions: T

A

= +25°C, unless otherwise specified.)

Symbol

V

REF

Parameter

Reference Voltage

0.5%

1.0%

Test

Circuit

4

Conditions

V

KA

= V

REF

, I

KA

= 10mA

0 to +70°C

-40 to +85°C

-40 to +125°C

∆V

KA

= 10V to V

REF

∆V

KA

= 36V to 10V

Min

2.487

2.475

–

Typ

2.500

4.5

-1.0

-0.5

0.7

0.4

0.05

0.15

135.9

81.9

29.8

Max

2.512

2.525

8

10

16

-2.7

-2.0

4

1.2

1.0

0.5

–

°C/W

mV/V

µA

mA

µA

Ω

mV

Unit

V

∆V

REF

Deviation of Reference Voltage

Over Full Temperature Range

Ratio of Change in Reference

Voltage to the Change in Cathode

Voltage

Reference Current

Deviation of Reference Current

Over Full Temperature Range

Minimum Cathode Current for

Regulation

Off-state Cathode Current

Dynamic Impedance

4

V

KA

= V

REF

,

I

KA

= 10mA

∆V

REF

∆V

KA

I

REF

∆I

REF

I

KA

(Min)

I

KA

(Off)

Z

KA

5

4

6

4

I

KA

= 10mA

I

KA

= 10mA, R1 = 10KΩ, R2 =

∞

I

KA

= 10mA, R1 = 10KΩ, R2 =

∞

,

T

A

= -40 to +125°C

V

KA

= V

REF

V

KA

= 36V, V

REF

= 0

V

KA

= V

REF

, I

KA

= 1 to 100mA,

f

≤

1.0KHz

SOT-23

SOT-23-5

TO-92

SOT-89

θ

JC

Thermal Resistance

–

AS431

Document number: DS36599 Rev. 3 - 2

5 of 19

www.diodes.com

October 2013

参数名称	属性值
欧盟限制某些有害物质的使用	Compliant
ECCN (US)	EAR99
Part Status	Unconfirmed
Reference Type	Adjustable
Topology	Shunt
Initial Accuracy	0.5%
Maximum Temperature Coefficient	20ppm/°C(Typ)
Output Voltage (V)	2.5 to 36
Maximum Input Voltage (V)	40
Maximum Output Current (mA)	100
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	125
系列 Packaging	Ammo
Supplier Package	TO-92
Pin Count	3
Standard Package Name	TO-92
Mounting	Through Hole
Package Height	4.83(Max)
Package Length	4.78(Max)
Package Width	3.66(Max)
PCB changed	3
Lead Shape	Formed

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