Diodes Incorporated

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AP4312 (Not Recommended for new design)

NRND = Not Recommended for New Design

Constant Voltage and Constant Current Controller

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The AP4312 is a highly integrated solution for a constant voltage/constant current mode SMPS application. 
The AP4312 contains one 1.21V voltage reference, one low voltage reference used in current sensing circuit and two operational amplifiers. The 1.21V 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 AP4312 is fully compatible with AP4306 in functionality and electrical characteristics except its lower reference voltage for current control loop, thus higher power efficiency in SMPS applications such as low power charger can be realized with AP4312 compared to AP4306.


  • Constant Voltage and Constant Current Control
  • Precision Internal Voltage Reference
  • Low External Component Count 
  • Easy Compensation
  • Low Supply Current: 180µA
  • Current Control Loop Reference: 70mV      
  • Operating Supply Voltage: 1.7V to 18V


  • Battery Chargers

Product Specifications

Product Parameters

Constant VoltageReference Tolerance (%) ±0.5
ReferenceVoltage (V) 1.21
SupplyCurrent (mA) 0.18
VCC Maximum Rating 18
VSENSE (mV) 70

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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-2642 2023-09-05 2024-03-05 Device End of Life (EOL)