AP2303 Datasheet, PDF (1/15 Pages) Diodes Incorporated – DDR BUS TERMINATION REGULATOR

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Diodes Incorporated
AP2303
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
tightly with the reference voltage (1/2VDDQ) within ±10mV.
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
 Support DDR-II (VTT=0.9V), DDR-III (VTT=0.75V), DDR-IIIL
(VTT=0.675V), DDR-IV (VTT=0.6V) Application
 Source and Sink up to 1.75A Current
 Output Voltage Accuracy Over Full Load: ±2% (Max.)
 Soft Start-up and Shutdown along with VIN, VCNTL and VREFEN
Rising and Shutdown along with VIN, VCNTL and VREFEN Dropping
 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)
 Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
VIN 1
GND 2
VREFEN 3
VOUT 4
SOIC-8
(Top View)
8 NC
7 NC
6 VCNTL
5 NC
VIN 1
GND 2
VREFEN 3
VOUT 4
Exposed
Pad
PSOP-8
8 NC
7 NC
6 VCNTL
5 NC
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
V_CNTL=3.3V/5V
V_IN=1.8V/1.5V/1.35V/1.2V
Shutdown
1
6
R1
VIN
VCNTL
3 _{VREFEN AP2303 VOUT} 4
Enable
R2 _CSS
GND
2
C_CNTL
C_IN
R_TT
C_{OUT RDUMMY}
AP2303
Document number: DS36546 Rev. 3 - 2
1 of 15
www.diodes.com
September 2014
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