Diodes Incorporated
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AP2303 (Not Recommended for new design)

NRND = Not Recommended for New Design

DDR Bus Termination Regulator

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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.


  • 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
  • Halogen and Antimony Free. “Green” Device


  • Desktop PC, Notebook Mother Board
  • Graphic Card
  • STB, LCD-TV, Web-TV

Product Specifications

Product Parameters

Accuracy 25C 1
Adj. Vout (V) 1.25 to 10
Adj. Vout 1.25, 10
Adjustable VFB (V) VREFIN
AEC Qualified No
Automotive Compliant and PPAP capable no
Channels 1
Compliance (Only Automotive supports PPAP) Standard
Enable Active Yes (High)
Features N/A
Iout (A) 1.75
IQ (mA) 0.5
Iq (max) (µA) 1500
Iq (max) (µA) 1500
Iq (max) (µA) 1500
Iq (max) (µA) 1500
Iq (typ) (µA) 1000
Iq (typ) (µA) 1000
Iq (typ) (µA) 1000
Operating Temperature (Ambient) (°C) -40 to 85
Output Discharge No
Output options Adjustable
Power Good No
Reverse Protection No
Type LDO
VCTL Function No
VDROPOUT (Max) 0.52
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage 0.52
VDROPOUT (Max) (V) at Max Current and Max Voltage 0.52
VDROPOUT (Max)(V) at Max Current and Max Voltage 0.52
VIN (Max) N/A
Vin (Max) (V) 6
VIN (Min) N/A
Vin (Min) (V) 1.2
Vout (max) 5
Vout (min) 0.6

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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-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site