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Diodes Incorporated APK43070Q Single-Chip Synchronous Buck Controller

Diodes Incorporated APK43070Q Single-Chip Synchronous Buck Controller (SBC) is integrated with a USB Type‑C® Power Delivery (PD3.1) source controller. This supports Standard Power Range (SPR) up to 21V, Programmable Power Supply (PPS) up to 21V, Extended Power Range (EPR) up to 28V, and Adjustable Voltage Supply (AVS) up to 28V. The APK43070Q combines a high‑efficiency constant‑frequency step‑down controller with integrated drivers for external N-MOSFETs for medium‑ to high‑power designs. The controller integrates the SBC and PD3.1 decoder functions, reducing the PCB size and footprint for high-power-density charging applications. The I2C communication and multi‑port addressing (up to 8 ports) allow smart power sharing without an external microcontroller. The Diodes Incorporated APK43070Q SBC is AEC‑Q100 qualified and optimized for reliable USB-PD charging in vehicle power systems.

Features

  • AEC-Q100 Qualified for automotive applications
  • Single-chip buck controller with Type-C PD3.1 source controller
  • Supports USB PD3.1 EPR/AVS up to 28V and SPR/PPS up to 21V
  • Operating switching frequency is 125kHz/250kHz/400kHz configurable via GPIO3
  • Power sharing through I2C
  • High PWM duty cycle up to 95% at 125kHz / 90% @ 400kHz
  • 4V to 36V operating input voltage range
  • Supports bypass mode to enhance output power efficiency
  • Frequency dithering for EMI restraining
  • Supports legacy BC1.2, and QC3.0/4/4+/5.0
  • Supports external OTP via TS pin
  • -40°C to 125°C operating temperature range
  • I2C-based topology up to 8 ports without an external MCU
  • Supports I2C addresses up to 8 and assigned by GPIO1
  • Supports PDO profiles selected by GPIO2
  • Extremely low standby power (<180μA) with wake-up
  • Comprehensive protection schemes:
    • Overvoltage (OVP)
    • Undervoltage (UVP)
    • Overcurrent (OCP)
    • Overtemperature (OTP)
    • Moisture detection of the connector with auto-recovery
  • VBUS short protection on CC1/CC2 and DP/DN pins up to 30V
  • Totally lead-free and fully RoHS compliant
  • Halogen free, antimony free, green device

Applications

  • USB PD charging for Type-C ports in automotive battery systems of up to 24V
  • USB PD charging for both single and multiple Type-C ports in vehicles

Videos

Block Diagram

Block Diagram - Diodes Incorporated APK43070Q Single-Chip Synchronous Buck Controller

Typical Application Circuit

Application Circuit Diagram - Diodes Incorporated APK43070Q Single-Chip Synchronous Buck Controller

Additional Resourcew

Published: 2026-06-02 | Updated: 2026-10-13