Diodes Incorporated

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Constant Voltage and Constant Current Controller

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The AP4320 is a highly integrated solution for a constant voltage/constant current mode SMPS application.
The AP4320 contains one 2.5V voltage reference and two operational amplifiers. The 2.5V voltage reference, combined with one operational amplifier, makes of an ideal voltage controller for use in adapters and battery chargers. The low voltage reference, combined with another operational amplifier, makes of an ideal current limiter for output low side current sensing.
The AP4320 is available in SOT26 package.


  • Constant Voltage and Constant Current Control
  • Low External Component Count
  • Easy Compensation
  • Low Supply Current: 190µA
  • Precision Internal Voltage Reference: 2.5V
  • Operating Supply Voltage: 3.5V to 36V
  • Low Current Sense Threshold: 30mV/50mV
  • Totally Lead-free & Fully RoHS Compliant 
  • Halogen and Antimony Free. “Green” Device


  • AC/DC Adapters
  • Battery Chargers
  • LED Drivers

Product Specifications

Product Parameters

Constant VoltageReference Tolerance (%) ±0.5 %
ReferenceVoltage (V) 2.5 V
VSENSE (mV) 30/50 mV
VCC Maximum Rating 38
SupplyCurrent (mA) 0.19 mA

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Technical Documents

Recommended Soldering Techniques


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-2568 2022-03-29 2022-03-29 Qualified Additional Assembly & Test (A/T) Sites, Bill of Material, and updated Data Sheets for Package Outline Dimension Change
PCN-2514 2021-03-09 2021-06-09 Additional Wafer Source JKFAB