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 both Standard Power Range (SPR)/Programmable Power Supply (PPS) up to 21V and Extended Power Range (EPR)/Adjustable Voltage Supply (AVS) up to 28V. The APK43070Q SBC combines a high‑efficiency constant‑frequency step‑down controller with integrated drivers for external N-MOSFETs, enabling optimized performance in medium‑ to high‑power designs. The APK43070Q controller integrates the SBC and PD3.1 decoder functions and results in a small footprint and reduced PCB size for high-power-density charging applications. This APK43070Q SBC includes I2C communication and multi‑port addressing (up to 8 ports), allowing smart power sharing without an external microcontroller. The 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
- Support USB PD3.1 EPR/AVS up to 28V and SPR/PPS up to 21V
- Operating switching frequency is 125kHz/250kHz/400kHz configurable via GPIO3
- Support power sharing through I2C
- Support high PWM duty cycle up to 95% @125kHz / 90% @ 400kHz
- 4V to 36V operating input voltage range
- Support 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 by TS pin
- -40°C to 125°C operating temperature range
- Supports 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
- Supports extremely low standby power (<180μA) with wake-up
- Support comprehensive protection schemes:
- Over Voltage Protection (OVP)
- Under-Voltage Protection (UVP)
- Over Current Protection (OCP)
- Over Temperature Protection (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- and 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
Block Diagram
Typical Application Circuit
