Diodes Incorporated
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USB PD Controller with Integration of Synchronous Rectification Controller

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The DIODES™ AP43671 is a highly integrated and intelligent USB Type-C power delivery (PD) controller with an embedded synchronous rectification (SR) controller. It is ideally targeted for cost-performance-sensitive USB Type-C adaptors and charger applications.

The device supports USB PD3. 0 V1.2, and Programmable Power Supply (PPS) and Qualcomm QC4/QC4+ protocols. Leveraging its embedded MCU and supporting circuitry, the AP43671 can accommodate popular quick-charging protocols for firmware stored in One-Time-Programmable (OTP) memory.

To enable optimal system BOM and performance implementation of quick chargers, the AP43671 embeds a multiple-mode adaptive SR controller where its key performance and safety parameters can be fine-tuned by a built-in MCU.

The AP43671 also adopts a relatively small current-sensing resistor (5mΩ) that is used to provide accurate current measurements without sacrificing power consumption.

The AP43671 provides robust protection schemes, which includes a CC1/CC2 short protection against VBUS (up to 24V) as well as built-in OVP/OCP/SCP/OTP features to provide necessary safety protection.


  • Supports USB PD3.0 Programmable Power Supply (PPS)
  • USB-IF PD3.0/PPS Certificated TID = 4999
  • Compatible with QC4/QC4+ protocol
  • MCU-based implementation for protocol decoding, application firmware, parameter fine-tuning and calibration.
  • OTP (One-Time-Programmable) for main protocol and application firmware
  • MTP (Multi-Time-Programmable) for system configuration options
  • Built-in regulator for CV and CC control, no need for external CC/CV reference circuitry
  • Ultra-low current consumption (550uA) at sleep mode
  • Supports power-saving mode to enable low standby power of chargers
  • Embed Synchronous Rectification (SR) Controller, which supports Adaptive Quasi-Resonant (QR) and Continuous Conduction Mode (CCM) for matching PWM controllers.
  • Small current-sensing resistor (5 mΩ) for efficiency improvement
  • Adaptive gate drive for external N-MOSFET output enable switch
  • Supports e-marker cable detection and VCONN power (20mA)
  • Supports SCP/OTP/OVP/UVP with auto-restart
  • CC1/CC2 pins shorted to VBUS protection up to 24V
  • Minimum system BOM components for quick charger implementations.
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative.



  • Battery chargers for smart phones, table PCs, and any USB Type-C PD-equipped mobile devices
  • Wall and travel chargers for AC-DC adaptors (USB Type-C-equipped Notebook PCs)

Product Specifications

Product Parameters

Compliance (Only Automotive(Q) supports PPAP) Standard
Protocols Supported PD3.0/3.1/QC4/QC4+ (MCU+OTP + Hardwired)
Power Role DFP (Downstream-Facing Port) Source
I2C Support No
SR Controller Embedded Yes
VBUS MOS Embedded No
VCC Maximum Rating 24
VCC UVLO (V) 2.7

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