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AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1086

Document number: DS31028 Rev. 6 - 2 1 of 10

www.diodes.com June 2010

Description

AP1086 is a low dropout positive adjustable or fixed-mode

regulator with 1.5A 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. AP1086 is also well suited

for other applications such as VGA cards. AP1086 is

guaranteed to have lower than 1.4V dropout at full load

current making it ideal to provide well-regulated outputs of

1.25V to 5.0V with 4.7 to 12V input supply by different output

voltage.

Features

• 3-Terminal Adjustable or Fixed 1.5V, 1.8V, 2.5V,3.3V,

5.0V

• 1.4V Maximum Dropout at Full Load Current

• Fast Transient Response

• Built-in Thermal Shutdo wn

• Output Current Limiting

• Lead Free Packages: TO252-3L, TO263-3L, TO220-3L

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

“Green” Molding Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

Pin Assignments

VIN

VOUT

Adj (GND)

(Top View)

Tab is VOUT

TO252-3L

VIN

VOUT

Tab is VOUT

(Top View)

Adj (GND)

TO263-3L

Tab is VOUT

VOUT

Adj (GND)

(Top View)

VIN

TO220-3L

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

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

Typical Application Circuit

5V to 3.3V Fixed Mode Regulator Adjustable Regulator

100uF

3.3V/1.5A

Tab is Vout

Vin

Vout

GND

100uF

121

100uF

2.5V/1.5A

Tab is Vout

Vin

Vout

100uF

Adj

VOUT=Vref (1+R2/R1)

Ω

)

(

VV +∗=

Note:

AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1086

Document number: DS31028 Rev. 6 - 2 2 of 10

www.diodes.com June 2010

Pin Descriptions

Pin Name I/O Pin # Description

Adj (GND) 1 Adjustable (Ground only for fixed mode)

VOUT O 2

The output of the regulator. A minimum of 10uF 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 higher than VOUT in order for the device to regulate properly.

Functional Block Diagram

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 Junction Temperature 150 oC

Recommended Operating Conditions

Symbol Parameter Min Max Unit

Top Operating Junction Temperature Range 0 125

AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1086

Document number: DS31028 Rev. 6 - 2 3 of 10

www.diodes.com June 2010

Electrical Characteristics (Under Operating Conditions)

Parameter Conditions Min Typ. Max Unit

Reference Voltage AP1086-Adj TA = 25οC, (VIN-VOUT)= 1.5V,IO = 10mA 1.225 1.250 1.275

Output Voltage

AP1086-1.5 IOUT = 10mA, TA = 25οC, 3V≦VIN≦12V 1.470 1.500 1.530 V

AP1086-1.8 IOUT = 10mA, TA = 25οC, 3.3V≦VIN≦12V 1.764 1.800 1.836 V

AP1086-2.5 IOUT = 10mA, TA = 25οC, 4V≦VIN≦12V 2.450 2.500 2.550 V

AP1086-3.3 IOUT = 10mA, TA = 25οC, 4.8V≦VIN≦12V 3.235 3.300 3.365 V

AP1086-5.0 IOUT = 10mA, TA = 25οC, 6.5V≦VIN≦12V 4.900 5.000 5.100 V

Line Regulation AP1086-XXX IO = 10mA, VOUT+1.5V<VIN<12V - - 0.2 %

Load Regulation

AP1086-Adj VIN = 3.3V, 0mA<Io<1.5A, TA = 25οC

(Note 2, 3) - - 1 %

AP1086-1.5 VIN = 3V, 0mA<Io<1.5A, TA = 25 οC

(Note 2, 3) - 12 15 mV

AP1086-1.8 VIN = 3.3V, 0mA<Io<1.5A, TA = 25οC

(Note 2, 3) - 15 18 mV

AP1086-2.5 VIN = 4V, 0mA<Io<1.5A, TA = 25οC

(Note 2, 3) - 20 25 mV

AP1086-3.3 VIN = 5V, 0≦IOUT≦1.5A, TA = 25οC,

TJ = 25oC (Note 2, 3) - 26 33 mV

AP1086-5.0 VIN = 8V, 0≦IOUT≦1.5A, TA = 25οC,

TJ = 25oC (Note 2, 3) - 40 50 mV

Dropout Voltage

(VIN-VOUT) AP1086-Adj/-2.5/

-3.3/-3.6/-5.0 IOUT = 1.5A, ΔVOUT = 1%VOUT - 1.3 1.4 V

Current Limit AP1086-Adj/-2.5/

-3.3/-3.6/-5.0 (VIN-VOUT) = 5V 1. 6 - - A

Minimum Load

Current (Note 4) AP1086-XXX 0oC≦TJ≦125oC - 5 10 mA

Thermal Regulation TA = 25οC, 30ms pulse - 0.008 0.04 %/W

Ripple Rejection f = 120Hz,COUT = 25uF Tantalum, IOUT = 1.5A

AP1086-XXX VIN = VOUT+3V - 60 70 dB

RMS Noise (% of VOUT) 10Hz ≤ f ≤ 10KHz - 0.003 - %

Temperature Stability IO = 10mA - 0.5 - %

θJA Thermal Resistance

Junction-to-Ambient

(No heat sink; No air flow)

TO252-3L

TO263-3L

TO220-3L - 101

86 - oC/W

θJC Thermal Resistance

Junction-to-Case

TO252-3L: Control Circuitry/Power Transistor

TO263-3L: Control Circuitry/Power Transistor

TO220-3L: Control Circuitry/Power Transistor - 15

0.65/2.7

0.65/2.7 - oC/W

Notes: 2. 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.

3. Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the difference in input and

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

4. Quiescent current is defined as the minimum output current required in maintaining regulation. At 12V input/output differential the device is

guaranteed to regulate if the output current is greater than 10mA.

AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1086

Document number: DS31028 Rev. 6 - 2 4 of 10

www.diodes.com June 2010

Functional Description

Introduction

The AP1086 adjustable or fixed-mode Low Dropout (LDO) regulator is a 3 terminal device which can easily be

programmed by internal mask change to any voltages within the range of 1.25V to VIN-1.4V. The AP1086 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

1.5A load step.

The AP1086 is specifically designed to meet the fast current transient needs as well as providing an accurate

initial voltage, reducing the overall syste m cost with the need for fewer output capacitors.

Load Regulation

Since the AP1086 is only a 3 terminal device, it is not possible to provide true remote sensing of the output

voltage at the load. But it can supply good load regulation by internal feedback bypass the external loss such as

adjustable mode.

Stability

The AP1086 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 AP1086 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 ke pt 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.

AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1086

Document number: DS31028 Rev. 6 - 2 5 of 10

www.diodes.com June 2010

Typical Performance Characteristics

Temperature (

Percent Change in Output Voltage vs Temperature

Output Voltage Change (%)

-50 -25 0 25 50 75 100 125 150

- 2

-1.5

- 1

-0.5

0. 5

1.5

Input Voltage (V)

Line Regulation

Output Voltage Deviation (%)

0.2

0.4

0.6

0.8

6 8 10 12

TIME (us)

Line Transient Response

Output Voltage Devi ation (mV) Input Voltage (V)

-40

-20

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 Devi ation (mV)

010

20 30 40 50 60 70 80 90 100

-1

-20

-10

30 Cin=1uF

Cout=10uF Tantalum

Preload=100mA

Temperature (

Load Regulation vs Temperature

Output Voltage Deviation (%)

-25 0 25 50 75 100 125

- 1

-0.80

-0.40

-0.20

0.20

I load=1.5A

Output Current (A)

Dropout Voltage vs Output Current

Dropout Voltage (V)

0. 2

0. 4

0. 6

0. 8

1. 0

1. 2

1. 4

1. 6

1. 8

2. 0

Tj = 25

Tj = 125

0.25 0.5 0.75 1.0 1.25 1.5

AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1086

Document number: DS31028 Rev. 6 - 2 6 of 10

www.diodes.com June 2010

Ordering Information

AP1086 X XX X - X

Low Dropout Regulator Package Vout

K : TO263-3L

D : TO252-3L

T : TO220-3L

Blank = Adj

15 = 1 .5V

18 = 1 .8V

25 = 2 .5V

33 = 3 .3V

50 = 5 .0V

Packing

U : Tube

13 : Taping & Reel

Lead Free

G : Green

L : Lead Free

Device Package

Code Packaging

(Note 5)

Tube 13” Tape and Reel

Quantity Part Number

Suffix Quantity Part Number

Suffix

AP1086DXXL-13 D TO252-3L NA NA 2500/Tape & Reel -13

AP1086DXXG-13 D TO252-3L NA NA 2500/Tape & Reel -13

AP1086KXXL-13 K TO263-3L NA NA 800/Tape & Reel -13

AP1086KXXG-13 K TO263-3L NA NA 800/Tape & Reel -13

AP1086TXXL-U T TO220-3L 50 -U NA NA

AP1086TXXG-U T TO220-3L 50 -U NA NA

Notes: 5. 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.

AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1086

Document number: DS31028 Rev. 6 - 2 7 of 10

www.diodes.com June 2010

Marking Information

(1) TO252-3L

86-VV

( Top view )

YY WW X X

Logo

Part Number

1086 for ADJ

86-VV : 15 for 1.5V

18 for 1.8V

25 for 2.5V

33 for 3.3V

50 for 5.0V

L : Lead Free

G : Green

X : Internal Code

WW : Week : 01~52, 52 represents

YY : Year : 01~09

52 and 53 week

(2) TO263-3L

1086-VV

( Top view )

YY WW X X

Logo

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

G : Green

(3) TO220-3L

1086-VV

( Top view )

YY WW X X

Logo

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

G : Green

L : Lead Free

AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1086

Document number: DS31028 Rev. 6 - 2 8 of 10

www.diodes.com June 2010

Package Outline Dimensions (All Dimensions in mm)

(1) Package type: TO252-3L

5.20/5.50 T yp 5.35

6.354/ 6.80 T yp 6.58

2.28

BSC.

0.61 Typ

0.88/1.27

4.57 BS C. 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

15.7

10.9

9.1

Land Pa ttern Recomm endation (Unit: mm)

2.54

0.38 Typ

AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1086

Document number: DS31028 Rev. 6 - 2 9 of 10

www.diodes.com June 2010

Package Outline Dimensions (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 15.3 5

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

AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

AP1086

Document number: DS31028 Rev. 6 - 2 10 of 10

www.diodes.com June 2010

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