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 with Programmable Power Supply (USB-PD PPS), along with other RapidCharge protocols at output powers up to 100W.

The iW9801 pairs with Renesas' iW709 secondary-side IC, which integrates fast charge protocol support, USB Type-C control and synchronous rectification FET control. 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.

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 optocoupler fails
  • Intelligent, eco-friendly low standby power <20mW
  • Supports USB Power Delivery 3.0 with PPS (iW709)
  • 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


Type Date
PDF 526 KB Product Brief
PDF 5.51 MB 日本語 Brochure
PDF 705 KB Datasheet
ZIP 3.94 MB Other
ZIP 6.78 MB Other
5 items

Design & Development


Companion Products

Secondary-Side USB Power Delivery 3.0 Interface IC Integrated with Synchronous Rectifier Controller and VBUS FET Driver