iW656

USB Power Delivery Controller for AC/DC Power Adapters

Rev. 1.0

Product Summary

© 2018 Dialog Semiconductor

www.dialog-semiconductor.com

1 of 8

09-Jan-2018

1 Description

The iW656 is a USB Power Delivery (USB PD) interface controller which handles the communication between a

default 5V and/or maximum current limitation (e.g. 3A) for higher power output or better efficiency through the USB PD

CC1/CC2 pins for MD attach/detach detection. The iW656 also integrates a high current charge-pump circuit to drive

The iW656 resides on the secondary side of an AC/DC power supply and negotiates voltage and current settings

depending on the requests from the MD. The iW656 uses Dialog’s proprietary secondary-to-primary digital

communication technology and when paired with Dialog’s primary-side

RapidCharge™ controllers, such as iW1781,

the iW656 eliminates the need for a discrete decoder on the primary side by using one optocoupler to transmit all

necessary information for rapid charging to the primary side. This includes output voltage requests, output current

limits, output voltage undershoot, output over-voltage, and fault and reset signals. The iW656 incorporates Dialog’s

proven and reliable DLNK technology to communicate from the secondary to the primary and also has a built-in

optocoupler LED driver to minimize the bill of material cost.

The power supply designed with the iW656 is fully protected. Using over-voltage protection on the D+/D-/CC1/CC2 pins,

the iW656 helps to address soft short issues in cables and connectors caused by poor or loose connections between the

cable connector and the socket, contamination in the USB connector, or a worn out cable. Additionally, proprietary short

used with an external NTC resistor for protection from over-temeperature faults.

The iW656 also optionally supports legacy D+/D- communication protocols including Samsung Adaptive Fast Charge

disabled by simple power supply circuit configuration.

2 Features

● Supports USB PD 2.0

x

Integrated CC transmitter/receiver supports BMC

communication

● Supports up to 7 Power Data Objects (PDOs)

● Supports wide output voltage range from 3 to 20V

● Supports direct charge through Vendor Defined

Message (VDM)

● Compatible with USB Type-C specification Rev 1.2 for

MD attach/detach detection

switch

switch from damage due to an output short circuit

● Proprietary secondary-to-primary digital

3 Applications

● Rapid-charging AC/DC adapters for smart phones,

tablets and other portable devices

communication eliminates discrete decoders on the

primary side and simplifies system designs

● D+/D-/CC1/CC2 over-voltage protection (OVP)

address soft short issues in the output cables and

connectors

● Programmable active fast discharge from a high

request with built-in switch or external switch

● Intelligent low-power mode helps achieve < 20mW

overall system no-load power consumption during 5V

steady-state operation

● Optionally supports AFC/QC2.0/QC3.0 fast charging

technologies for output voltage and current

negotiation

● 12-pin 3x3mm TDFN package