1 Description

The iW760 is an AC/DC secondary-side controller for USB Power Delivery (PD) 3.0 with Programmable Power Supply

(PPS) support which integrates a secondary-side regulation controller, interface protocol controller, USB VBUS driver

and synchronous rectifier controller into a single IC.

The iW760 allows rapid charge of USB PD PPS enabled mobile devices (MDs). It resides on the secondary side of an

AC/DC travel adapter (TA) and allows the TA to be configured for multi-level output voltage and current.

The iW760 measures the output voltage and load current and sends the results to a digital compensator for closedloop

control of flyback converter. The digital control signal generated by the compensator is converted to an analog

signal and transferred to primary controller via an optocoupler.

The iW760 controller is a hard-wired state machine, so no MCU coding is required. This eliminates potential malicious

or inadvertent access to chargers or power supplies designed with the iW760 and prevents them from sourcing voltages

via the USB cable higher than a smartphone, tablet, laptop or other product can handle, which may damage the

product.

The iW760 is also an advanced synchronous rectifier (SR) controller with an integrated MOSFET driver. The device

works with an external power MOSFET to replace the main rectifying diode on the secondary of a flyback converter.

The SR control block with proprietary technologies optimizes the SR on/off timing and driving voltage to achieve best

efficiency.

The iW760 should be paired with Renesas’ high power-density Flyback primary-side controllers such as the iW9860

to achieve high efficiency, accurate voltage/current control and fast dynamic load response. Furthermore, iW9860

and iW760 can enter an extremely low consumption state when MD is unplugged so that TA standby power is < 5mW

(Zero standby power1).

2 Features

● Zero standby power consumption with lowest system

cost (< 5mW at 230VAC when output USB cable is

detached in a typical 25W USB PD travel adapter)1

● Supports USB PD3.0 with PPS for output voltage from

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

● High resolution accuracy multi-level output voltage and

current control

● Built-in digital loop compensation to minimize the

external component count

● Built-in synchronous rectification controller with

integrated driver

● Optimized VDS-based SR timing and driving control

with wide output range

● Supports D- Impedance detection

● NFET driver for VBUS switch

● Active fast discharge from a high voltage to 5V at MD

unplug or from a high voltage level to a lower level

upon request

● Hard-wired state machine

x No MCU and firmware required

x Prevents chargers and power supplies from being

hacked and damaged

● Supports DCM and CCM operation

● 14-Lead TDFN package