AP2303

Document number: DS36546 Rev. 3 - 2

1 of 15

www.diodes.com

September 2014

© Diodes Incorporated

AP2303

A Product Line of

Diodes Incorporated

DDR BUS TERMINATION REGULATOR

Description

The AP2303 is a low dropout linear regulator to generate termination

voltage of DDR-SDRAM system. The regulator can source or sink up

to 1.75A current continuously. The output voltage is regulated to track

The AP2303 supports soft start-up when used to turn on the VCNTL

and VREFEN. It integrates a shutdown circuit that will be triggered

once the voltage of VIN, VCNTL or VREFEN falls below a certain

value.

AP2303 features over temperature protection and current limit

protection for both source and sink.

AP2303 is available in packages of SOIC-8 and PSOP-8.

Features





Source and Sink up to 1.75A Current



Output Voltage Accuracy Over Full Load: ±2% (Max.)





Flexible Output by 2 External Resistors



Requires

Minimum

10µF

Output

Ceramic

Capacitor

for

Application



Current Limit Protection for Both Source and Sink



OTSD Protection



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halo

gen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

SOIC-8

(Top View)

PSOP-8

Applications



DDR-II/DDR-III/DDR-IIIL/DDR-IV Memory System



Desktop PC, Notebook Mother Board



Graphic Card



STB, LCD-TV, Web-TV

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html

for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Typical Applications Circuit

VIN

VCNTL

VREFEN

GND

R1

R2

1

4

2

3

6

Shutdown

Enable

VIN

GND

VREFEN

VOUT

NC

NC

VCNTL

NC

1

2

3

4

8

7

6

5

1

2

3

4

8

7

6

5

VOUT

GND

VIN

NC

NC

VCNTL

NC

VREFEN

Exposed

Pad