A1084 [AITSEMI]

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR;


型号：	A1084
厂家：	AiT Semiconductor
描述：	5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
文件：	总12页 (文件大小：555K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

DESCRIPTION

FEATURES

ꢀ

Provide Fixed Version and an Adjustable

Version, Output Value can be customized on

command.

The A1084 is a series of low dropout three terminal

regulators with a dropout of 1.4V at 5A load current.

ꢀ

Maximum Output Current: 5A

Other than a fixed version (V_OUT= 1.8V, 2.5V, 3.3V,

5V), The A1084 has an adjustable version, which

can set the output voltage with two external

resistors.

Range of Operation Input Voltage: Max 15V

Line Regulation: 0.2% (Typ.)

Load Regulation: 0.2% (Typ.)

Environment Temperature: 0^oC to +80^oC

Available in TO-252, TO-263-2 and TO-263-3

Package

The A1084 offers thermal shutdown and current limit

functions, to assure the stability of chip and power

system.

APPLICATION

ꢀ

Power Management for Computer Mother

Board, Graphic Card

The A1084 is available in TO-252, TO-263-2 and

TO-263-3 package.

ꢀ

Battery Charger

Microprocessor Supply

Post Regulators for Switching Supplies

ORDERING INFORMATION

TYPICAL APPLICATION

Package Type

TO-252

Part Number

A1084DR-XX

A1084DVR-XX

A1084S2R-XX

A1084S2VR-XX

A1084S3R-XX

A1084S3VR-XX

TO-263-2

TO-263-3

Adjustable Version

V_OUT= V_REFx (1 + R2 / R1) + I_ADJx R2

XX: Output Voltage,

33 = 3.3V, 50 = 5V,

ADJ: Adjustable

Note

R : Tape & Reel

V: Green Package

Fixed Output Version

AiT provides all Pb free products

Suffix “ V “ means Green Package

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 1 -

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

PIN DESCIPTION

Top View

TO-252

TO-263-2

TO-263-3

A1084DR-XX

A1084DR-ADJ

ADJ

A1084S2R-XX

A1084S2R-ADJ

ADJ

A1084S3R-XX

A1084S3R-ADJ

ADJ

GND

V_OUT

V_IN

GND

V_OUT

V_IN

GND

V_OUT

V_IN

V_OUT

V_IN

ABSOLUTE MAXIMUM RATINGS

Maximum Input Voltage

15V

150^oC

Junction Temperature (T_J)

Environment Temperature (T_A)

Storage Temperature (Ts)

Lead Temperature and Time

80^oC

-65^oC to 150^oC

260^oC, 10S

Stresses above 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 in the Electrical Characteristics is not implied. Exposure to absolute maximum

rating conditions for extended periods may affect device reliability.

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 2 -

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

ELECTRICAL CHARACTERISTICS

Test Condition: C_IN=10uF, C_OUT=22uF, T_A= 25^oC, unless otherwise noted.

Symbol

Parameter

Reference

Conditions

Min.

Typ.

Max. Unit

_OUT= 10mA, V_IN− V_OUT= 3V

1.238 1.25 1.262

1.225 1.25 1.275

1.782 1.80 1.818

1.764 1.80 1.836

2.475 2.50 2.525

2.450 2.50 2.550

V_REF

Voltage

10mA ≤ I_OUT≤ 5A, 1.5V ≤ V_IN− V_OUT≤ 5V

I_OUT= 0mA, V_IN= 4.8V, T_J= 25^oC

1.8V

10mA ≤ I_OUT≤ 5A, 3.4V ≤ V_IN≤ 7V

I_OUT= 0mA, V_IN= 5.5V, T_J= 25^oC

2.5V

10mA ≤ I_OUT≤ 5A, 4.1V ≤ V_IN≤ 7V

V_OUT

Output Voltage

I_OUT= 0mA, V_IN= 6.3V, T_J= 25^oC

3.3V

3.267

3.234

4.95

3.3

5.0

3.333

3.366

5.05

10mA ≤ I_OUT≤ 5A, 4.9V ≤ V_IN≤ 8V

I_OUT= 0mA, V_IN= 8.0V, T_J= 25^oC

5.0V

10mA ≤ I_OUT≤ 5A, 6.6V ≤ V_IN≤ 10V

4.90

5.10

ADJ I_OUT= 10mA, 2.85V ≤ V_IN≤ 12V

1.8V I_OUT= 10mA, 3.4V ≤ V_IN≤ 12V

2.5V I_OUT= 10mA, 4.1V ≤ V_IN≤ 12V

3.3V I_OUT= 10mA, 4.9V ≤ V_IN≤ 12V

0.035

0.2

Line Regulation

(Note1)

ΔV_OUT

5.0V I_OUT= 10mA, 6.6V ≤ V_IN≤ 12V

ADJ V_IN− V_OUT= 3V, 10mA ≤ I_OUT≤ 5A

1.8V V_IN− V_OUT= 3V, 0mA ≤ I_OUT≤ 5A

0.4

0.2

Load Regulation

(Note1, 2)

2.5V V_IN− V_OUT= 3V, 0mA ≤ I_OUT≤ 5A

3.3V V_IN− V_OUT= 3V, 0mA ≤ I_OUT≤ 5A

5.0V V_IN− V_OUT= 3V, 0mA ≤ I_OUT≤ 5A

ΔV_OUT

Dropout Voltage

(Note 3)

V_IN−V_OUT

ΔV_OUT, ΔV_REF= 1%, I_OUT= 5A

1.4

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 3 -

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

Symbol

Parameter

Conditions

_IN− V_OUT= 3V, T_J= 25^oC

Min. Typ. Max. Unit

Current Limit

7.0

I_LIMIT

Minimum Load

A1084-ADJ

Current (Note 4)

Quiescent Current V_IN= 10V

Adjustable Version

I_ADJ

Adjust Pin Current

110

V_IN= 4.25V, I_OUT= 10mA

F = 120Hz, C_OUT= 25uF (Tan)

I_OUT= 5A, V_IN− V_OUT= 3V

Ripple Rejection

Adjust Pin Current 10mA ≤ I_OUT≤ 5A,

I_CHANGE

0.2

Change

1.5V ≤ V_IN− V_OUT≤ 6V

I_OUT= 10mA,

Temperature Stability

0.5

V_IN− V_OUT= 1.5V

TO-252

Thermal Resistance

Junction to Case

12.5

Θ_JC

^oC/W

TO-263-2 and TO-263-3

Note 1: The Parameters of Line Regulation and Load Regulation are tested under constant junction temperature.

Note 2: When I_OUTvaries between 0 to 5A, V_IN– V_OUTvaries between 1.5V to 6.0V under constant junction temperature, the

parameter is satisfied the criterion as above mentioned. If temperature varies between 0^oC ≤ T_A≤ 80^oC, it needs output

current to be larger than 10mA to satisfy the criterion.

Note 3: Dropout Voltage is tested under I_OUT= 5A and the following testing conditions:

First step is to find out the V_OUTvalue (V_OUT1) when V_IN1= V_OUT+ 1.5V,

Second step is to decrease V_IN(V_IN2) until V_OUTvalue is equal to 99% x V_OUT1(V_OUT2). V_DROPOUT= V_IN2– V_OUT2

Note 4: Minimum Load Current is defined as the minimum output current required to maintain regulation.

When 1.5V ≦ V_IN– V_OUT≦ 6V, the device is guaranteed to regulate if the output current is greater than 10mA.

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 4 -

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

TYPICAL PERFORMANCE CHARACTERISTICS

1.Dropout Voltage vs. Output Current

2.Output Voltage vs. Temperature

3.Output Voltage vs. Output Current

4.Load Transient Response

5.Line Transient Response

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 5 -

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

BLOCK DIAGRAM

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 6 -

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

DETAILED INFORMATION

A1084 is a series of low dropout voltage, three terminal regulators which application circuit of fixed version

only needs two capacitors and the adjustable version only needs two resistors and two capacitors to work. It

is composed of some modules including start-up circuit, bias circuit, band-gap, thermal shutdown, current limit,

power transistors and its driver circuit and so on.

Thermal Shutdown and Current Limit

The A1084 thermal shutdown and current limit modules can assure chip and its application system working

safety when the environment temperature is larger than 80^oC or output current is larger than 5.2A.

Stable Reference Output Voltage

The band-gap module provides stable reference voltage, whose temperature coefficient is compensated by

careful design considerations. The temperature coefficient is under 100ppm/^oC. And the accuracy of

output voltage is guaranteed by trimming technique.

Application Hints (See Schematic 1)

1. Recommend using 10uF Tan capacitor (C_IN) as bypass capacitor for all application circuit.

2. Recommend using 22uF Tan capacitor (C_OUT) to assure circuit stability.

3. Using a bypass capacitor (C_ADJ) between the adjust terminal and ground can improve ripple rejection, this

bypass capacitor prevents ripple from being amplified as the output voltage is increase. The impedance

of C_ADJshould be less than the resistor’s (R1) which is between output and adjust pins to prevent ripple

from being amplified at any ripple frequency. As R1 is normally in the range of 120Ω ~ 200Ω, the value of

C_ADJshould satisfy this equation: 1 / (2πx F_RIPPLEx C_ADJ) < R1. Recommend using 10uF Tan capacitor.

Output Voltage of Adjustable Version

The A1084 adjustable version provides 1.25V reference voltage. Any output voltage between 1.25V ~ 10V

can be available by choosing two external resistors (connection method is shown in Schematic 1), R1 and R2

are the two external resistors.

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 7 -

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

Example

The output voltage of A1084 adjustable version satisfies this followed equation:

V_OUT= V_REFx (1+R2 / R1) + I_ADJx R2

We can ignore I_ADJbecause I_ADJ(about 50uA) is much less than the current of R1 (about 4mA).

The value of R1 should be in the range 120Ω ~ 200Ω to assure chip working normally without any load. To

assure the electrical performance showed in Table 1, the output current should be larger than 5mA. If R1 is

too large, the minimum output current should be large than 4mA, the best working condition is to assure that

the output current exceeds 10mA.

(Schematic 1)

Adjustable Version (A1084)

V_OUT= V_REFx (1+R2 / R1) + I_ADJx R2

Fixed Output Version (A1084-XX)

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 8 -

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

PACKAGE INFORMATION

Dimension in TO-252 (Unit: mm)

Tape Dimension

Reel Dimension

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 9 -

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

Dimension in TO-263-2 (Unit: mm)

Tape Dimension

Reel Dimension

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 10 -

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

Dimension in TO-263-3 (Unit: mm)

Tape Dimension

Reel Dimension

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 11 -

A1084

AiT Semiconductor Inc.

www.ait-ic.com

5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR

THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS

IMPORTANT NOTICE

AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to

discountinue any integrated circuit product or service without notice, and advises its customers to obtain the

latest version of relevant information to verify, before placing orders, that the information being relied on is

current.

AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to

be suitable for use in life support applications, devices or systems or other critical applications. Use of AiT

products in such applications is understood to be fully at the risk of the customer.

As used herein may

In order to

involve potential risks of death, personal injury, or servere property, or environmental damage.

minimize risks associated with the customer's applications, the customer should provide adequate design and

operating safeguards.

AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT

warrants the performance of its products of the specifications applicable at the time of sale.

REV1.2

- JUN 2007 RELEASED – SEP 2008 REVISED -

- 12 -

A1084 [AITSEMI]

相关型号：

A1084-A

A1084-A/B

A1084-B

A10842MNCB

A10842MNCBE

A10842MNCBF

A10842MNCBK

A10842MNCG

A10842MNCGE

A10842MNCGF

A10842MNCGK

A10842MNCQ