Diodes Incorporated

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Constant Voltage and Constant Current Controller

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The AP4305 is a highly integrated solution for a constant voltage/constant current mode SMPS application. The AP4305 contains one 1.21V voltage reference with ± 0.5% accuracy, one current sensing circuit and two operational amplifiers. Combining the voltage reference with one operational amplifier makes AP4305 an ideal voltage controller for use in adapters and battery chargers. The other low voltage reference combined with the other operational amplifier makes it an ideal current limiter for output low side current sensing.


  • Constant Voltage and Constant Current Control
  • Precision Internal Voltage Reference
  • Few External Components
  • Easy Compensation
  • Low Supply Current: 0.5mA
  • Operating Temperature Range: -40 to 105°C


  • Adapters
  • Battery Chargers

Product Specifications

Product Parameters

Constant VoltageReference Tolerance (%) ±0.5 %
ReferenceVoltage (V) 1.21 V
VSENSE (mV) 200 mV
VCC Maximum Rating 18
SupplyCurrent (mA) 0.5 mA

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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-2514 2021-03-09 2021-06-09 Additional Wafer Source JKFAB