The iW9801 digital AC/DC controller integrates Renesas' patented adaptive Zero Voltage Switching (ZVS) technology to enable ultra-small, lightweight, low-cost, and easily portable power supplies for smartphones, tablets, laptops, power tools, and other portable products. The device operates at high switching frequencies, which allows for a much smaller transformer and passive components, and supports USB Power Delivery 3.0 and 3.1 EPR with Programmable Power Supply (USB PD PPS), along with other RapidCharge protocols at 100W+ output power.

The iW9801 pairs with Renesas' iW709 secondary-side IC, which integrates fast charge protocol support, USB Power Delivery 3.0 Type-C control, and synchronous rectification FET control. It also pairs with Renesas' iW780 secondary-side IC, which supports USB PD 3.1 EPR. The combined chipset offers a complete high-power density AC/DC charging solution, efficiencies up to 94%, and advanced protection features to enable high-power charging with safe, cool operation in a small physical charger size.

The iW9801 also pairs with the iW780 for USB PD 3.1 for single- and multi-port adapters up to 240W.

The iW9801 is compatible with Transphorm GaN technology.

Learn more about Renesas' patented adaptive ZVS technology.


  • High switching frequency
    • Lighter, smaller transformer
    • Smaller passive components for easier EMI control
  • Patented adaptive ZVS control for high efficiency and low EMI
    • Efficiently recycles energy to minimize heat generation
    • Up to 94% efficiency
    • Eases thermal management and reduces heatsink size
  • User-configurable ZVS timing optimizes performance for different power MOSFETs
  • Adaptive, seamless multi-mode control (MMC) improves efficiency and eliminates audible noise
  • Compatible to drive GaN devices
  • AC unplug detection and X-cap discharge
  • Rich protection for:
    • Overvoltage (OVP)
    • Overcurrent (OCP)
    • User-configurable over-temperature
    • Shoot-through
    • Brown-in/Brown-out
    • VSENSE/ISENSE short
    • Output short
    • Extra primary-side OCP and OVP if the optocoupler fails
  • Intelligent, eco-friendly low standby power <20mW
  • Supports USB Power Delivery 3.0 with PPS (iW709)
  • Pairs with the iW780 for USB PD 3.1 EPR for single- and multi-port adapters up to 240W
  • Compatible with Transphorm GaN devices
  • Hardwired state-machine solution prevents hacking of fast chargers. To learn more, see our "RapidCharge™ Controllers Prevent Fast Charger Hacking" blog




  • Low cost, ultra-small, light-weight RapidCharge AC/DC power supplies and adapters for smartphones, tablets, laptops, power tools and other portable devices using USB PD
  • USB Power Delivery 3.1 power supplies
  • Multi-port chargers and adapters


Type Title Date
Product Brief PDF 526 KB
Brochure PDF 5.49 MB 日本語
Datasheet Log in to Download PDF 705 KB
Other Log in to Download ZIP 3.94 MB
Other Log in to Download ZIP 6.78 MB
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