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AP2303 (NRND)

NRND = Not Recommended for New Design

DDR Bus Termination Regulator

Datasheet

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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

Specifications & Technical Documents

Product Parameters

Accuracy 25C	1
Adjustable VFB (V)	VREFIN
AEC Qualified	No
Channels	1
Compliance (Only Automotive Supports PPAP)	Standard
Enable Active	Yes (High)
Features	N/A
I_OUT	N/A
Iout (A)	1.75
I_{Q (mA)}	0.5
Iq (typ) (µA)	1000
Output Discharge	No
Output options	Adjustable
Power Good	No
PSRR	N/A
Reverse Protection	No
Type	LDO
VCTL Function	No
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage	0.52
Vin (Max) (V)	6
Vin (Min) (V)	1.2
V_OUT	N/A
Vout (max)	5
Vout (min)	0.6

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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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-2740	2025-06-16	2025-12-16	Product End of Life (EOL)
PCN-2512	2021-04-16	2021-07-16	Qualified Additional Assembly & Test (A/T) Site