Power & Power Management



Pairs with iW709 to Create a Complete Solution for High-Power Density USB PD 3.0 Chargers and Travel Adapters

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


Title Type Date
Product Brief
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ZIP6.78 MB

Design & Development