AP1084D33L-U - Diodes - Datasheet.Directory

AP1084

5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1084 Rev. 9 1 of 11 JANUARY 2010

DS31070 www.diodes.com © Diodes Incorporated

• 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

• Lead Free Packages: TO252-3L, TO263-3L and

TO220-3L

• TO252-3L, TO263-3L and TO220-3L: Available in

“Green” Molding Compound (No Br, Sb)

• Lead Free Finish/RoHS Compliant (Note 1)

AP1084 is a low dropout positive adjustable or fixed-mode

regulator with 5.0A 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 su pply. AP1084 is also well suited for o ther

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.

Typical Application Circuit

5.0V to 3.3V Fixed Mode Regulat or

C2

100uF

5V

3.3V/5A

Tab is Vout

Vin

Vout

GND

C1

100uF

Adjustable Regulator

R1

R2 C2

100uF

5V

2.5V/5A

Tab is Vout

Vin

Vout

Adj

C1

100uF

121

Ω

)

R1

R2

(1 VREF

VO+∗=

Note:

Features General Description

AP1084

5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1084 Rev. 9 2 of 11 JANUARY 2010

DS31070 www.diodes.com © Diodes Incorporated

AP1084 X XX X - X

Package Vout

D : TO252-3L

T : TO220-3L

K : TO263-3L

Blank = Adj

15 = 1.5V

18 = 1.8V

25 = 2.5V

33 = 3.3V

50 = 5.0V

Packing

U : Tube

13 : Tape & Reel

Lead Free

L : Lead Free

G : Green

Device Package

Code Packaging

(Note 2)

Tube 13” Tape and Reel

Quantity Part Number

Suffix Quantity Part Number

Suffix

AP1084DXXL-13 D TO252-3L NA NA 2500/Tape & Reel -13

AP1084DXXG-13 D TO252-3L NA NA 2500/Tape & Reel -13

AP1084KXXL-13 K TO263-3L NA NA 800/Tape & Reel -13

AP1084KXXG-13 K TO263-3L NA NA 800/Tape & Reel -13

AP1084TXXL-U T TO220-3L 50 -U NA NA

AP1084TXXG-U T TO220-3L 50 -U NA NA

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applie d. Please visit our website at

http://www.diodes.com/products/lead_free.html.

2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at

http://www.diodes.com/datasheets/ap02001.pdf.

Ordering Information

AP1084

5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1084 Rev. 9 3 of 11 JANUARY 2010

DS31070 www.diodes.com © Diodes Incorporated

Pin Assignment

(1) TO252-3L (2) TO263-3L

3

2

1

VIN

VOUT

Adj (GND)

( Top View )

Tab is VOUT

3

2

1

VIN

VOUT

Tab is VOUT

( Top View )

Adj (GND)

(3) TO220-3L

Tab is VOUT

VOUT

Adj (GND)

( Top View)

VIN

1

2

3

Pin Nam e I/O Pin # Description

Adj (GND) I 1 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).

VOUT O 2

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

be connected from this pin to ground to insure stability.

VIN I 3

The input pin of regulator. Typically a large storage capacitor 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.

Pin Description

AP1084

5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1084 Rev. 9 4 of 11 JANUARY 2010

DS31070 www.diodes.com © Diodes Incorporated

Block Diagram

3

Thermal

Shutdown 1

2Vout

Adj

1.25V +

+

CURRENT

LIMIT

Vin

+-

+

-

Absolute Maximum Ratings

Symbol Parameter Rating Unit

VIN DC Supply Voltage -0.3 to 12 V

TST Storage Temperature -65 to +150 oC

TMJ Maximum Ju nction Temperature 150 oC

Recommended Operating Conditions

Symbol Parameter Min Max Unit

TOP Operating Junction Temperature Range 0 125

oC

AP1084

5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1084 Rev. 9 5 of 11 JANUARY 2010

DS31070 www.diodes.com © Diodes Incorporated

Electrical Characteristics (Under Operating Conditions)

Symbol Parameter Conditions Min Typ. Max Unit

VREF Reference

Voltage Io = 10mA, TA = 25oC, (VIN-VOUT) = 1.5V 1.225 1.250 1.275 V

Line

Regulation

AP1084-XXX IO = 10mA , VOUT+1.5V<VIN<12V, TA = 25oC 0.2 %

AP1084-1.5 IOUT = 10mA, TA = 25oC, 3V≦VIN≦12V 1.470 1.500 1.530 V

AP1084-1.8 IOUT = 10mA, TA = 25oC, 3.3V≦VIN≦12V 1.764 1.800 1.836 V

AP1084-2.5 IOUT = 10mA, TA = 25oC, 4V≦VIN≦12V 2.450 2.500 2.550 V

AP1084-3.3 IOUT = 10mA, TA = 25oC, 4.8V≦VIN≦12V 3.235 3.300 3.365 V

AP1084-5.0 IOUT = 10mA, TA = 25oC, 6.5V≦VIN≦12V 4.900 5.000 5.100 V

Load

Regulation

AP1084-Adj VIN = 3.3V, 0mA<Io<5A, TA = 25oC 1 %

AP1084-1.5 VIN = 3V, 0mA<Io<5A, TA = 25oC

(Note 3, 4) 12 15 mV

AP1084-1.8 VIN = 3.3V, 0mA<Io<5A

TA = 25oC (Note 3, 4) 15 18 mV

AP1084-2.5 VIN = 4V, 0mA < Io < 5A

TA = 25oC (Note 3, 4) 20 25 mV

AP1084-3.3 VIN = 5V, 0mA < Io < 5A, TA= 25oC (Note 3, 4) 26 33 mV

AP1084-5.0 VIN = 8V, 0mA < Io < 5A, TA = 25oC

(Note 3, 4) 40 50 mV

ΔVo Dropout

Voltage Io = 5.0A (ΔVOUT = 1% VOUT) 1.3 1.4 V

Current Limit VIN-VOUT = 5V 5.1 A

Minimum Load

Current 5 10 mA

Temperature

Stability Io = 10mA 0.5 %

TSD Thermal

Shutdown

Temperature 150 OC

θJA

Thermal

Resistance

Junction-to-

Ambient

(Note 5)

TO220-3L 78

OC/W

TO252-3L 73

TO263-3L 60

θJC

Thermal

Resistance

Junction-to-

Case (Note 5)

TO220-3L:Control Circuitry/Power Transistor 3.5

OC/W

TO252-3L:Control Circuitry/Power Transistor 12

TO263-3L:Control Circuitry/Power Transistor 3.5

Notes: 3. See thermal regulation specifications for changes in output voltage due to heating effect s. 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.

4. Line and load regulation are guaranteed up to the maximum power dissipation of 15W. 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.

5. Test conditions for TO220-3L, TO252-3L and TO263-3L: Devices mounted on FR-4 substrate, single sided PC board, 2oz copper, with minimu m

recommended pay layout, no air flow. The case point of θJC is located on the thermal tab.

AP1084

5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1084 Rev. 9 6 of 11 JANUARY 2010

DS31070 www.diodes.com © Diodes Incorporated

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 r esponse

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

and 0 to 5.0A 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 prog ramm ed to a ny v oltages in the rang e of 1.25V to Vin-1.4V with th e additio n of R1 and R 2 ext ernal resistors

according to the following formula:

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

55uA typically R1 & R2 as shown below:

AP1084

Vin Vout

Vref

Adj 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

minimu m load curr ent requir ement of the AP1 084 is 10mA , R1 is typi cally selecte d to be 121 Ω 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.

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 di rectly

to the case or the VOUT pin of the regulator and not to the loa d. It is importan t to note that for high cu rrent ap plications, th is can re-prese nt

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 150oC, it is

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

kept below that 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.

AP1084

5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1084 Rev. 9 7 of 11 JANUARY 2010

DS31070 www.diodes.com © Diodes Incorporated

Typical Performance Characteristics

Temperature (oC)

Percent Change in Output Voltage vs Temperature

O

u

t

pu

t

V

o

l

t

age

C

hange (%)

-40 -25 0 25 50 75 100 125 150

- 2

-1.5

- 1

-0.5

0

0. 5

1

1.5

2

Input Voltage (V)

Line Regulation

Output Voltage Deviation (%)

0

0.2

0.4

0.6

0.8

1

24

681012

TIME (us)

Line Transient Response

Output Voltage Deviation (mV) Input Voltage (V)

-40

-20

0

20

40

5.5

6.5

7.5 Cin=1uF

Cout=10uF Tantalum

0 20 40 60 80 100 120 140 160 180 200

TIME (us)

Load Transient Response

Load Current (A) Output Voltage Deviation (mV)

010

20 30 40 50 60 70 80 90 100

0

2

4

6

-40

-20

0

20

40

60 Cin=1uF

Cout=10uF Tantalum

Preload=100mA

Output Current (A)

Dropout Voltage vs Output Current

D

ropou

t

V

o

l

t

age (

V

)

0

0. 2

0. 4

0. 6

0. 8

1. 0

1. 2

1. 4

1. 6

1. 8

2. 0

01234

Tj = 125 oC

Tj = 25 oC

5Temperature (oC)

Load Regulation vs Temperature

Output Voltage Deviation (%)

-40 0 25 50 75 100 125

- 1

-0.80

-0.40

-0.20

0

0.20

I load=1.5A

AP1084

5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1084 Rev. 9 8 of 11 JANUARY 2010

DS31070 www.diodes.com © Diodes Incorporated

Marking Information

(1) TO252-3L

84-VV

( Top view )

YY WW X X

Logo

Part Number

1084 for ADJ

84-VV : 15 for 1.5V

1 8 for 1.8V

2 5 for 2.5V

3 3 for 3.3V

5 0 for 5.0V

L : Lead Free

G : Green

X : Inte rn al C o d e

WW : Week : 01~52, 52 represents

YY : Year : 0 1~09

52 and 53 week

(2) TO263-3L

1084-VV

( Top view )

YY WW X X

Logo

G : Green

Part Number

VV: 15 for 1.5V

18 for 1.8V

25 for 2.5V

33 for 3.3V

50 for 5.0V

Blank for ADJ

X : Internal code

YY : Year : 01~09

WW : Week : 01~52, 52 represents

52 and 53 week

L : Lead Free

(3) TO220-3L

1084-VV

( Top view )

YY WW X X

Logo

G : Green

Part Number

VV: 15 for 1.5V

18 for 1.8V

25 for 2.5V

33 for 3.3V

50 for 5.0V

Blank for ADJ

X : Internal code

WW : Week : 01~52, 52 represents

YY : Year : 01~09

52 and 53 week

L : Lead Free

AP1084

5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1084 Rev. 9 9 of 11 JANUARY 2010

Package Information (All Dimensions in mm)

(1) Package type: TO252-3L

5.20/5.50 Typ 5.35

6.354/6.80 Typ 6.58

2.28

BSC.

0.61 Typ

0.88/1.27

4.57 BSC. 9.00/10.40 Typ 9.70

SEATING

PLANE

SEE NOTE2

0.51

5.6

11.0

5.6

2.0

2.25

Land Pattern Recommendation (Unit: mm)

7.2

1.2

2.18/2.40

Typ 2.29

0.45/0.58

Typ 0.52

0.64/1.02

Typ 0.83

0.45/0.58

Typ 0.52

0.89/

1.14

5.40/6.20

Typ 5.57

(2) Package type: TO263-3L

9.65/10.29 Typ 9.97

2.54

BSC.

2.92

Typ 1.30

0.51/0.99 Typ 0.75

1.14/1.40 Typ1.27

8.65/9.65 Typ 9.15

1.27/

1.78

Typ

1.52 14.61/15.88 Typ 15.24

4.06/4.83

Typ 4.45

1.14/1.40

Typ 1.27

2.28/2.80 Typ 2.54

1.3

3

15.7

10.9

9.1

Land Pattern R ecomm endation (Unit: m m )

2.54

0.38 Typ

AP1084

5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1084 Rev. 9 10 of 11 JANUARY 2010

Package Information (Continued)

(3) Package type: TO220-3L

3.55/4.85

Typ 4.20 0.51/1.40

Typ 0.95

0.31/1.14

Typ 0.72

SEATING PLANE

14.20/16.50

Typ 15.35

9.70/10.70

Typ 10.20

12.72/14.72

Typ 13.72

0.51/1.14

Typ 0.83

4.83/5.33

Typ 5.08

1.14/1.78

Typ 1.46

3.53/4.09

Typ 3.81

5.84/6.86

Typ 6.35

2.54/3.43

Typ 2. 98

3.66/6.35

Typ 5. 00

2.03/2.92

Typ 2.48

2.99/2.79

Typ 2.54

∅

AP1084

5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1084 Rev. 9 11 of 11 JANUARY 2010

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DOCUMENT, INC LUDING, BU T NOT LI MITED TO, T HE IMP LIED WA RRANTIE S OF MERCHA NTABILIT Y AND FIT NESS FOR A

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