Diodes Incorporated
SO 8

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AP43331N (Not Recommended for new design)

NRND = Not Recommended for New Design


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The AP43331N is a highly integrated secondary side constant voltage (CV) and constant current (CC) controller, which is compatible with Qualcomm Quick Charge 3.0 (QC 3.0) High Voltage Dedicated Charging Port (HVDCP) Class A specification.

The AP43331N allows for selection of the output voltage of an AC−DC USB charger based on commands from the Portable Device (PD) being powered. Selecting a higher charging voltage will reduce the charging current for a given power level resulting in reduced IR drops and increased system efficiency. The USB−bus voltage can be controlled in discreet steps (QC 3.0’s step is 0.2V). The output current is limited not to exceed maximum allowable power level.

The AP43331N resides at the secondary side of the charger. It includes voltage and current feedback regulation eliminating the need for a shunt regulator such as TL431.

The AP43331N has a current sense amplifier to amplify the detected output current signal for contribution to accomplishing CC feature and output cable voltage compensation function.

The AP43331N incorporates a decoder used to translate Qualcomm QC3.0 protocol into internal configuration indicator, according to which the CV/CC loops will regulate the output voltage and current.

The AP43331N integrates a safe−discharge circuitry to quickly and reliably discharge output capacitors when the output voltage is switched down.

The AP43331N automatically keeps 5V output voltage in case that the connected portable device is not compatible with the QC3.0.

The AP43331N is available in SO-8 package.


  • Constant Voltage and Constant Current Regulation
  • Supporting Qualcomm QC 3.0 Class A (3.6V Up to 12V)
  • Output Cable Voltage Compensation
  • High Precision CV/CC References
  • Fast Dynamic Response
  • Removing the Need for a Shunt Regulator Such As TL431
  • Output Capacitor Safe−Discharge Circuitry At the Output Voltage Switched Down.
  • Output Over Voltage Protection (OVP)
  • Output Under Voltage Protection (UVP)
  • Operating Supply Voltage: 3.2V to 12V


  • AC/DC Adapters
  • Battery Chargers
  • LED Drivers

Product Specifications

Product Parameters

Current Sense Reference(5V/9V/12V) 75mV/50mV/37.5mV
OperatingCurrent (µA) 770
Protocol Compatible QC3.0
VCC UVLO (V) 2.8
VCC Maximum Rating 20
Voltage Sense Reference(5V/9V/12V) 0.5V/0.9V/1.2V

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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-2594 2022-08-31 2023-02-28 Device End of Life (EOL)