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


Pairs with iW9801 (100W Applications) or iW9809 (65W Applications) for Complete, Low Total BOM Cost Solution

The iW709 integrates a USB power delivery (USB PD) 3.0 interface controller with a synchronous rectifier (SR) controller and USB Type-C disconnect FETs into one device for low total BOM cost USB PD chargers and travel adapters.

The device pairs with the iW9801 to create Zero Voltage Switching (ZVS) power supplies for applications requiring up to 100W and the iW9809 to enable a two-chip solution for low total BOM cost USB PD applications to 65W.  

The iW709 supports ZVS timing with adaptive SR control and drive for optimal efficiency, along with intelligent low power mode to enable very low no-load power consumption when paired with the iW980x products. Fully digital voltage compensation eliminates the need for external passive components for loop compensation.  

A full array of protection features includes over-voltage and over-current and over-temperature protection circuits. The OTP protection has two independent protection circuits, one working with an external NTC resistor and the second using an internal temperature sensor that can derate the output power to keep the charger or adapter from overheating.

Lifecycle status

● Active


Fully integrated secondary-side controller for USB Power Delivery 3.0 with PPS

  • Protocol interface
  • Secondary-side regulation
  • Integrated synchronous rectifier controller
  • USB Type-C NFET driver for disconnect function

Supports USB PD 3.0 w/PPS and other RapidCharge protocols

100W power supply solutions when paired with the iW9801 ZVS primary-side controller

65W power supply solutions when paired with the iW9809 quasi-resonant primary-side controller

High resolution control over the output voltage and current

  • 3.3V to 21V in 20mV steps
  • 50mA output current steps

Built-in digital loop compensation to reduce external component count

Programmable fast discharge to 5V at adapter unplug or voltage request

Supports both DCM and CCM operation

Rich protection for:

  • Over-voltage (OVP)
  • Over-current (OCP)
  • User-configurable over-temperature
  • USB PD-based power derating

Intelligent, eco-friendly low standby power

Hardwired state-machine solution prevents hacking of fast chargers. Learn more


Low-cost, ultra-small, light-weight RapidCharge AC/DC power supplies and adapters for smartphones, tablets and other portable devices using USB PD

Block Diagrams


Typical Applications Diagram


Typical Applications Diagram


Functional Block Diagram

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Product Briefs and Summaries
Name Date Version
iW709 Product Summary (448.39 KB) 02/11/2020 0.31
Name Date Version
iW709 Datasheet (1.03 MB) (Registered users only) 02/11/2020 0.21
Reference designs
Name Date Version
Reference Design EBC10245: iW9801-11 iW709-45-A8-02 45W ZVS Design (7.01 MB) (Registered users only) 14/06/2021 1.0
Reference Design EBC10246: iW9801 - 11 iW709-65-A7-04 65W USB PD ZVS Design (6.78 MB) (Registered users only) 14/06/2021 1.0