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AP2303

DDR Bus Termination Regulator

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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 (1/2V_DDQ) within ±10mV.

The AP2303 supports soft start-up when used to turn on the V_CNTL and V_REFEN. It integrates a shutdown circuit that will be triggered once the voltage of V_IN, V_CNTL or V_REFEN 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.

Feature(s)

Support DDR-II (V_TT=0.9V), DDR-III (V_TT=0.75V), DDR-IIIL (V_TT=0.675V), DDR-IV (V_TT=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 V_IN, V_CNTLand V_REFEN Rising and Shutdown along with V_IN, V_CNTL and V_REFEN 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
Halogen and Antimony Free. “Green” Device

Application(s)

DDR-II/DDR-III/DDR-IIIL/DDR-IV Memory System
Desktop PC, Notebook Mother Board
Graphic Card
STB, LCD-TV, Web-TV

Product Specifications

Product Parameters

Iq (max) (µA)	1500
Iq (typ) (?A)	1000
AEC Qualified	No
Compliance (Only Automotive supports PPAP)	Standard
Type	LDO
Output options	Adjustable
Iout (A)	1.75
Vin (Max) (V)	6
Vin (Min) (V)	1.2
Vout (min)	0.6
Vout (max)	5
Adjustable VFB (V)	VREFIN
Accuracy 25C	1
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage	0.52
Operating Temperature (Ambient) (°C)	-40 to 85
Enable Active	Yes (High)
Channels	1
Output Discharge	No
Power Good	No
Reverse Protection	No
VCTL Function	No

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2512	2021-04-16	2021-07-16	Qualified Additional Assembly & Test (A/T) Site