1 Description
The iW662 is an AC/DC secondary-side combo controller for Qualcomm® Quick ChargeTM 3.0 (QC3.0) which includes
USB interface, secondary-to-primary communication and synchronous rectification functions in a single IC.
The iW662 resides on the secondary side of an AC/DC power supply and allows the adapter to be configured for multi-level output voltages from 3.6V to 12V in 200mV increments, depending on the voltage requested by the mobile
device (MD). It can be used in Dialog’s primary-side controlled AC/ DC systems to achieve fast voltage transition, low noload power consumption, and fast dynamic load response.
The iW662 uses Dialog’s proprietary XM-Comm secondary-to-primary digital communication technology. When paired with one of Dialog’s primary-side controllers, the iW1790 or iW1796, the optocoupler can be completely eliminated in the
system. The iW662 transmits all necessary information for rapid charge through the power transformer, including output voltage requests, output current limits, output voltage undershoot, output over-voltage, and fault and reset signals.
The iW662 is also an advanced synchronous rectifier (SR) controller with an integrated MOSFET driver, enabling discontinuous mode flyback converters with high efficiency operation. The device works with an external power MOSFET to replace the main rectifying diode on the secondary of a flyback converter, improving efficiency by reducing
secondaryside conduction losses. Dialog’s digital adaptive turn-off control technology minimizes turn-off deadtime, eliminating the need for an additional Schottky diode that is typically needed in parallel with the synchronous MOSFET in conventional synchronous rectifiers.
The iW662 and iW1790/iW1796 provide double-layer cable protection. On the secondary side, the iW662 incorporates Dialog’s proprietary D+/D- over-voltage protection to address VBUS D+/D- soft shorts. On the primary side, the iW1790/iW1796 uses Dialog’s advanced fault control technology to reduce the average output power during soft shorts without latch.
Qualcomm® Quick ChargeTM 3.0 is a product of Qualcomm Technologies, Inc.
2 Features
● XM-Comm proprietary secondary-to-primary digital
communication transmits all information for rapid
charge without an optocoupler: output voltage
requests, output current limits, output voltage
undershoot, over-voltage protection, and other fault
and reset signals
● Lossless MOSFET VDS sensing for SR timing control with digital adaptive turn-off control
● Optimized 5V MOSFET gate driver
● High-voltage drain sensing up to 100V with no
additional external clamping circuits required
● Supports Qualcomm® Quick ChargeTM 3.0 technology
High Voltage Dedicated Charging Port (HVDCP) to
provide VBUS from 3.6V to 12V in 200mV increments
● Double-layer cable protection:
x Secondary side (iW662): Proprietary D+/D- overvoltage
protection (OVP) addresses VBUS D+/D-soft shorts
x Primary side (iW1790/iW1796): advanced fault
control technology reduces average output power
at fault conditions without latch
● Adaptive OVP/UV detection for most VBUS levels
● Backward compatible with QC2.0 and USB Battery
Charging Specification Revision 1.2 (USB BC1.2)
● Wide operating voltage range from 3V to 16V
● Programmable active fast discharge from a high
voltage to 5V at MD unplug or from a high voltage
level to a lower level upon request with built-in switch or external switch
● Intelligent low power mode enables < 20mW no-load power consumption
● 8-Lead SOIC package