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AP4312Q is an Automotive Grade product that is AEC-Q100 grade 1 qualified. It is a highly integrated solution for the constant voltage/constant current mode SMPS application and linear DC-DC regulator (used in Automotive application).

The AP4312Q 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 AP4312Q 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 AP4312Q compared to AP4306.


  • Adapters
  • Battery Chargers
  • Automotive
  • Power Train
  • Adapters
  • Chargers



  • Constant Voltage and Constant Current Control
  • Precision Internal Voltage Reference
  • Low External Component Count
  • Easy Compensation
  • Low Supply Current: 180mA
  • Current Control Loop Reference: 70mV
  • Operating Supply Voltage: 1.7V to 18V
  • Totally Lead-free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device
  • PPAP Capable

Product Specifications

Product Parameters

Constant Voltage Reference Tolerance ±0.5 %
Reference Voltage 1.21 V
VCC Max 18
Supply Current 0.18 mA

Related Content

SOT26 (SC74R)


Technical Documents

Recommended Soldering Techniques


Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AP4312QK6TR-G1 Digi-Key Electronics 2843 8/8/2020 Buy Now United States


Product Change Notices

PCN # Issue Date Subject
PCN-2246 2017-06-28 Additional Qualified Assembly/Test (A/T) Site – Chengdu A/T (CAT) with Part Marking Update