AP1084PB_技术文档

AP1084

1A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

General Description

Features

AP1084 is a low dropout positive adjustable or fixed-mode

regulator with minimum of 1.0A output current capability. The

product is specifically designed to provide well-regulated supply

for low voltage IC applications such as high-speed bus

termination and low current 3.3V logic supply. AP1084 is also

well suited for other applications such as VGA cards. AP1084 is

guaranteed to have lower than 1.4V dropout at full load current

making it ideal to provide well-regulated outputs of 1.25 to 3.3V

with 4.7 to 12V input supply.

•

1.4V maximum dropout at full load current

Built-in thermal shutdown

Output current limiting

Adjustable output voltage or fixed 1.5V, 1.8V, 2.5V,

3.3V, 5.0V

Fast transient response

Good noise rejection

Package: 3-Pin SOT223 and PowerDI™5 (Under

Development) packages

•

Ordering Information

AP1084 X

Package

X

Low Dropout Regulator

Vout

Packing

Lead Free

SK : SOT223-3L Blank : ADJ

PB : PowerDI™5 15 : 1.5V

18 : 1.8V

Blank : Lead-Free

G : Green

Blank : Tube or bulk

-7/-13 : Taping

25 : 2.5V

33 : 3.3V

50 : 5.0V

7” Tape and Reel

Quantity

13” Tape and Reel

Device

(Note 1)

Package Packaging

Part

Quantity

Part

Code

(Note 2)

Number

Suffix

AP1084SK

SK

PB

SOT-223

PowerDI™5

3000/Tape & Reel

-7

10,000/Tape & Reel

5000/Tape & Reel

-13

AP1084SK15

AP1084SK18

AP1084SK25

AP1084SK33

AP1084SK50

AP1084PB

AP1084PB15

AP1084PB18

AP1084PB25

AP1084PB33

AP1084PB50

-7

-13

-7

NA

-13

DS30802 Rev. 1 - 2

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AP1084

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AP1084

1A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

Block Diagram

Vin

3

2 Vout

+

-

+

1.25V

CURRENT

LIMIT

+

Thermal

Shutdown

1

Adj

Connection Diagram

3 PIN SOT-223

( Top View )

3

3 PIN PowerDI™5

( Top View )

Vin

3 Vin

Vout

2

1

Vout 1

2 Adj (GND)

Adj (GND)

Tab is Vout

Pin Descriptions

Pin No.

Name

I/O

Function

PowerDI™

SOT-223

5

Adjustable (Ground only for fixed mode)

A resistor divider from this pin to the Vout pin and ground sets the output voltage.

(Ground only for Fixed-Mode)

The output of the regulator. A minimum of 10uF (0.15Ω ≤ ESR ≤ 20Ω) capacitor must

be connected from this pin to ground to insure stability.

The input pin of regulator. Typically a large storage capacitor (0.15Ω ≤ ESR ≤ 20Ω) is

connected from this pin to ground to insure that the input voltage does not sag below the

minimum dropout voltage during the load transient response. This pin must always be

1.4V (1.3V) higher than Vout in order for the device to regulate properly.

Adj

(GND)

I

1

2

1

Vout

Vin

O

2/3/5/6/7/8

4

I

3

DS30802 Rev. 1 - 2

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AP1084

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AP1084

1A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

Absolute Maximum Ratings

Symbol

Parameter

Rating

Unit

Vin

P_D

DC Supply Voltage

Power Dissipation

-0.3 to 12

V

Internally Limited

o

T_ST

T_OP

Storage Temperature

-65 to +150

0 to +150

C

o

Operating Junction Temperature Range

C

Electrical Characteristics (Under Operating Conditions)

Sym.

Conditions (Notes)

Min.

Typ.

Max.

Unit

Parameter

V_REF

Reference Voltage

AP1084-XXX

AP1084-1.5

AP1084-1.8

AP1084-2.5

AP1084-3.3

AP1084-5.0

Io=10mA, Tj=25^oC, (Vin-Vout)=1.5V

I_O=10mA, V_OUT+1.5V<V_IN<12V, T_J=25^oC

I_OUT= 10mA, T_J= 25^oC, 3V≤V_IN≤12V

1.225

1.250

1.275

0.2

V

%

V

1.470

1.764

2.450

3.235

4.900

1.500

1.800

2.500

3.300

5.000

1.530

1.836

2.550

3.365

5.100

I

_OUT= 10mA, T_J= 25^oC, 3.3V≤V_IN≤12V

Line

Regulation

I_OUT= 10mA, T_J= 25^oC, 4V≤V_IN≤12V

I_OUT= 10mA, T_J= 25^oC, 4.8V≤V_IN≤12V

I_OUT= 10mA, T_J= 25^oC, 6.5V≤V_IN≤12V

V_IN=3.3V, 0mA<Io<1A, T_J=25^oC

(Note 1,2)

AP1084-Adj

AP1084-1.5

AP1084-1.8

AP1084-2.5

1

%

V_IN=3V, 0mA<Io<1A, T_J=25^oC

(Note 1,2)

12

15

20

15

18

25

mV

Load

Regulation

V_IN=3.3V, 0mA<Io<1A

T_J=25^oC (Note 1,2)

V_IN=4V, 0mA<Io<1A

T_J=25^oC (Note 1,2)

AP1084-3.3

AP1084-5.0

Dropout Voltage

V_IN= 5V, 0mA<Io<1A , T_J=25^oC (Note 1,2)

26

40

1.3

33

50

1.4

mV

V

_IN= 8V, 0mA<Io<1A, T_J=25^oC (Note 1,2)

∆Vo

Io=1.0A (∆Vout = 1% Vout)

Current Limit

Vin-Vout=5V

1.0

A

Minimum Load Current

Temperature Stability

Thermal Resistance

Junction-to-Ambient

(No heat sink ;No air flow)

5

0.5

10

mA

%

Io=10mA

SOT-223

Transistor

: Control Circuitry/Power

117

TBD

θ_JA

^OC/W

PowerDI™5 : Control Circuitry/Power Transistor

Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant junction

temperature by low duty cycle pulse testing. Load regulation is measured at the output lead = 1/18” from the package.

Note 2: Line and load regulation are guaranteed up to the maximum power dissipation of 5W. Power dissipation is determined by the difference between input

and output and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.

Note 3: Output is connected to the PCB copper area 5.5mm*5.5mm separately. If you need large PD or lower Tc & Tj, please connect to the large copper area

>> 5.5mm*5.5mm (like 10mm*10mm).

DS30802 Rev. 1 - 2

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AP1084

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AP1084

1A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

Typical Circuit

5V

C1

100uF

C1

100uF

Vin

V_o

Vout

Adj

Vout

2.5V/1A

3.3V/1A

R1

121

C2

100uF

C2

100uF

Ω

GND

R2

Ω

121

Tab is Vout

( 5V/3.3V fixed output )

( 5V/2.5V ADJ output )

R₂

Note:

V_o= V_REF∗(1+

)

R₁

Functional Description

Introduction

The AP1084 adjustable Low Dropout (LDO) regulator is a 3 terminal device that can easily be programmed with the addition of two

external resistors to any voltages within the range of 1.25V to Vin-1.4V. The AP1084 only needs 1.4V differential between Vin and Vout to

maintain output regulation. In addition, the output voltage tolerances are also extremely tight and they include the transient response as

part of the specification. For example, Intel VRE specification calls for a total of +/- 100mV including initial tolerance, load regulation and 0

to 1.0A load step.

The AP1084 is specifically designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the

overall system cost with the need for fewer output capacitors.

Output Voltage Setting

The AP1084 can be programmed to any voltages in the range of 1.25V to Vin-1.4V with the addition of R1 and R2 external resistors

according to the following formula:

Vout = Vref (1+ R2/R1) +Iadj *R2 , where Vref = 1.25 typically, Iadj =

55uA typically R1&R2 as shown at below

Vin

Vout

AP1084

Adj

Vref

R1

R2

Iadj=55uA

The AP1084 keeps a constant 1.25V between the output pin and the adjust pin. By placing a resistor R1 across these two pins a constant

current flows through R1, adding to the Iadj current and into the R2 resistor producing a voltage equal to the (1.25/R1)*R2+Iadj*R2 which

will be added to the 1.25V to set the output voltage. This is summarized in the above equation. Since the minimum load current

requirement of the AP1084 is 10mA, R1 is typically selected to be 121Ω resistor so that it automatically satisfies the minimum current

requirement. Notice that since Iadj is typically in the range of 55uA it only adds a small error to the output voltage and should only be

considered when a very precise output voltage setting is required. For example, in a typical 3.3V application where R1=121Ω and

R2=200Ω the error due to Iadj is only 0.3% of the nominal set point.

DS30802 Rev. 1 - 2

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AP1084

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AP1084

1A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

Functional Description (Continued)

Load Regulation

Since the AP1084 is only a 3 terminal device, it is not possible to provide true remote sensing of the output voltage at the load. The best

load regulation is achieved when the bottom side of R2 is connected to the load and the top-side of R1 resistor is connected directly to the

case or the Vout pin of the regulator and not to the load. It is important to note that for high current applications, this can re-present a

significant percentage of the overall load regulation and one must keep the path from the regulator to the load as short as possible to

minimize this effect.

Stability

The AP1084 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. For

most applications a minimum of 10uF aluminum electrolytic capacitor insures both stability and good transient response.

Thermal Design

The AP1084 incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the maximum

allowable junction temperature. Although this device can operate with junction temperatures in the range of 150^oC, it is recommended

that the selected heat sink be chosen such that during maximum continuous load operation the junction temperature is kept below the

temperature.

Layout Consideration

The output capacitors must be located as close to the Vout terminal of the device as possible. It is recommended to use a section of a

layer of the PC board as a plane to connect the Vout pin to the output capacitors to prevent any high frequency oscillation that may result

due to excessive trace inductance.

DS30802 Rev. 1 - 2

5 of 9

AP1084

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AP1084

1A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

Performance Characteristics

2. 0

1. 8

1. 6

1. 4

0.20

0

I load=1.5A

-0.20

-0.40

-0.80

- 1

Tj = 25 ^oC

1. 2

1. 0

0. 8

0. 6

0. 4

0. 2

0

Tj = 125 ^oC

25

50

75

100

125

-25

0

1

2

3

4

5

0

Temperature (^oC)

Output Current (A)

Dropout Voltage vs Output Current

Load Regulation vs Temperature

2

1.5

1

0.8

0. 5

0

0.6

0.4

-0.5

- 1

0.2

0

-1.5

- 2

-50 -25

0

25

50

75

100 125 150

6

8

10

12

2

4

Temperature (^oC)

Input Voltage (V)

Line Regulation

Percent Change in Output Voltage vs Temperature

7.5

60

40

Cin=1uF

Cout=10uF Tantalum

Preload=100mA

Cin=1uF

Cout=10uF Tantalum

6.5

20

0

5.5

40

-20

-40

6

20

0

4

-20

2

-40

0

20 40 60 80 100 120 140 160 180 200

TIME (us)

20 30 40 50 60 70 80 90 100

TIME (us)

Load Transient Response

0

10

Line Transient Response

DS30802 Rev. 1 - 2

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AP1084

1A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

Marking Information

(1) SOT-223

(Top view)

Datecode

Logo

W W

Y

: Year

OutputType

1084: ADJ

84-15:1.5V

84-18:1.8V

84-19:1.9V

84-25:2.5V

84-33:3.3V

84-50:5.0V

WW: Nthweek

1 0 8 4 X

Blank :LeadFree

G :Green

(2) PowerDI^™5

(Topview)

1084

Logo

Output Type

YWWX

Date code

: Year

1084 : ADJ

84-15: 1.5V

84-18: 1.8V

84-19: 1.9V

84-25: 2.5V

Y

WW: Nth w eek

Lead Free

Blank : Lead Free

G : Green

84-33: 3.3V

84-50: 5.0V

Date Code Key

Year

2006

2007

2008

2009

2010

Code

T

U

V

W

X

Month

Code

Jan

Feb March Apr

May

Jun

Jul

Aug Sep

Oct

Nov

Dec

1

2

3

4

5

6

7

8

9

O

N

D

DS30802 Rev. 1 - 2

7 of 9

AP1084

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AP1084

1A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

Package Diagrams (All Dimensions in mm)

(1) SOT-223

6.30/6.70 Nom 6.50

2.90 3.15 Ref.

3.3

3.30/3.70

Nom 3.50

1.50/2.00

Nom 2.00

2.3

1.2

Land Pattern Recommendation (Unit: mm)

2.3 Basic

4.6 Basic

13°

0.91/1.10

0.60/0.70

Nom 0.80

0.28/0.32

Nom 1.00

13°

Seating Plane

Nom 0.30

(2) PowerDI™5

1.05/

1.15

3.90/

4.05

1.70/

1.88

0.33/0.43

0.50/

0.65

6.40/

6.60

5.30/5.45

0.33/0.43

0.50/

0.65

0.80/

0.99

0.80/

0.99

3.90/4.05

3.05 NOM

0.75/0.95

1.70/1.88

6.40/6.60

3.55

NOM

1.20/1.50

0.80/0.99

0.50/0.65

0.80/0.99

DS30802 Rev. 1 - 2

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AP1084

1A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

Marking Code Table

Package

(Note 4)

Device

Marking Code

Date Code

AP1084SK

SOT-223

PowerDI™5

1084

84-15

84-18

84-25

84-33

84-50

1084

84-15

84-18

84-25

84-33

84-50

YWW

AP1084SK15

AP1084SK18

AP1084SK25

AP1084SK33

AP1084SK50

AP1084PB

AP1084PB15

AP1084PB18

AP1084PB25

AP1084PB33

AP1084PB50

Note:

4. For Packaging Details, go to our website at http://www.diodes.com/datasheets/ap02007.pdf.

DS30802 Rev. 1 - 2

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AP1084

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型号：	AP1084PB
厂家：	DIODES INCORPORATED
描述：	Regulator, 1 Output, BIPolar, PDFP3, 光电二极管
文件：	总9页 (文件大小：285K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

AP1084PB [DIODES]

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