The iW9861 digital AC/DC controller integrates Renesas’ patented quasi-resonant (QR) valley mode switching technology along with both CCM and DCM operation to enable ultra-small, light-weight, low-cost, and easily portable power supplies for smartphones, tablets, and other portable products. The iW9861 supports USB Power Delivery 3.0 with PPS at output powers up to 63W. It pairs with Renesas’ iW760 secondary-side IC, which integrates fast charge protocol support, USB Type-C® control, and synchronous rectification FET control.

Using proprietary intelligent power-saving technology, the iW9861+iW760 chipset consumes less than 20mW no-load standby power, without the need for an active startup DFET, making it the lowest standby power solution with the lowest total BOM count for adapters and chargers. 

The iW9861 further reduces the total power supply BOM count and system cost by integrating innovative gate driving and EMI reduction technologies, resulting in very low EMI power supplies using a minimum of external components. The iW9861’s adaptive QR mode also allows the use of smaller passive components.

For the zero standby power, please see the iW9860.


  • <20mW no-load power consumption (includes iW760 secondary-side IC power consumption)
    • No active startup device – reduced total BOM count and cost
  • Adaptive quasi-resonant (QR) control with DCM and CCM operation
    • Reduces overall transformer and passive component sizes
  • Adaptive, seamless multi-mode control (MMC) improves efficiency and eliminates audible noise
  • Intelligent gate drive technology removes need for external EMI reduction components
  • Supports voltage sensing with dual polarity of VCC auxiliary winding for optimized EMI and transformer design
  • Small SOT23-6 package enables single-side PCB design when paired with the iW760
  • AC unplug detection
  • Rich protection for:
    • Over-voltage (OVP)
    • Over-current (OCP)
    • User-configurable over-temperature
    • Shoot-through
    • Brown-in/brown-out 
    • VSENSE/ISENSE short
    • Output short
    • Extra primary-side OCP & OVP if optocoupler fails
  • Supports USB Power Delivery 3.0 with PPS (iW760)
  • Hardwired state-machine solution prevents hacking of fast chargers. Learn more




Low BOM count, light-weight 63W RapidCharge™ AC/DC power supplies and adapters for smartphones, tablets, in-wall power outlets and other portable devices using USB PD


Type Title Date
Product Brief PDF 503 KB
Brochure PDF 5.49 MB 日本語
Datasheet Log in to Download PDF 1.62 MB
3 items

Design & Development


RapidCharge Controllers Prevent Fast Charger Hacking