Overview

The iW709 integrates a USB Power Delivery (USB PD) 3.0 interface controller with a synchronous rectifier 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 synchronous rectifier control and drive for optimal efficiency, along with an 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 overvoltage and overcurrent 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.

iW709 Functional Block Diagram
iW709/iW9801 Typical Applications Diagram
iW709/iW9809 Typical Applications Diagram
iW709 Functional Block Diagram
iW709/iW9801 Typical Applications Diagram
iW709/iW9809 Typical Applications Diagram
  • Fully integrated secondary-side controller for USB Power Delivery 3.0 with Programmable Power Supply (PPS)
    • Protocol interface
    • Secondary-side regulation
    • Integrated synchronous rectifier controller
    • USB Type-C NFET driver for disconnect function
  • Supports USB PD 3.0 with 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:
    • Overvoltage (OVP)
    • Overcurrent (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. To learn more, read our "RapidCharge™ Controllers Prevent Fast Charger Hacking" blog.

Applications

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

Documentation

= Featured Documentation
Type Title Date
Datasheet
iW709 Datasheet
Log in to Download PDF 855 KB
Product Brief
iW709 Product Summary
PDF 533 KB
Other
Reference Design EBC10245: iW9801-11 iW709-45-A8-02 45W ZVS Design
Log in to Download ZIP 3.94 MB
Other
Reference Design EBC10246: iW9801 - 11 iW709-65-A7-04 65W USB PD ZVS Design
Log in to Download ZIP 6.78 MB
4 items

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

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    Blog Post Jan 27, 2022