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AP1086TXXL-U: Description1.5A LOW DROPOUT POSITIVE ADJUSTABLE; File Size192KB，10 Pages; ManufacturerDiodes; Websitehttp://www.diodes.com/

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1.5A LOW DROPOUT POSITIVE ADJUSTABLE

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AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

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.

Pin Assignments

(Top View)

Tab is V

OUT

Adj (GND)

TO252-3L

(Top View)

OUT

Adj (GND)

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 Shutdown

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)

Tab is V

OUT

TO263-3L

(Top View)

Tab is V

OUT

Adj (GND)

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

100uF

Vin

Vout

GND

Tab is Vout

3.3V/1.5A

100uF

Vin

Vout

Adj

Tab is Vout

121

Ω

121

Ω

100uF

Adjustable Regulator

OUT

ref

(1+R2/R1)

2.5V/1.5A

100uF

Note:

∗

( R

)

1 R

June 2010

AP1086

Document number: DS31028 Rev. 6 - 2

1 of 10

www.diodes.com

AP1086

1.5A LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

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 V

-1.4V. The AP1086 only

needs 1.4V differential between V

and V

OUT

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 system 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 150

C, 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 V

OUT

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 V

OUT

pin to the output capacitors to prevent

any high frequency oscillation that may result due to excessive trace inductance.

AP1086

Document number: DS31028 Rev. 6 - 2

4 of 10

www.diodes.com

June 2010

AP1086TXXL-U Related Products

	AP1086TXXL-U	AP1086	AP1086DXXL-13	AP1086DXXG-13	AP1086KXXL-13	AP1086KXXG-13	AP1086TXXG-U	AP1086_10
Description	1.5A LOW DROPOUT POSITIVE ADJUSTABLE	1.5A LOW DROPOUT POSITIVE ADJUSTABLE	1.5A LOW DROPOUT POSITIVE ADJUSTABLE	1.5A LOW DROPOUT POSITIVE ADJUSTABLE	1.5A LOW DROPOUT POSITIVE ADJUSTABLE	1.5A LOW DROPOUT POSITIVE ADJUSTABLE	1.5A LOW DROPOUT POSITIVE ADJUSTABLE	1.5A LOW DROPOUT POSITIVE ADJUSTABLE

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