Description:The iW636 is a Rapid Charge™ secondary-side controller for USB interface supporting Qualcomm® Quick Charge™ 3.0 (QC3.0) technology and secondary-to-primary communication protocol, that works with the iW1782 or iW1780H primary-side AC/DC digital controller to enable rapid charging of QC3.0/QC2.0-enabled mobile devices.The iW636 integrates an optocoupler driver that relays commands to the iW1782 or iW1780H AC/DC controllers. These chipsets provide efficiency as high as 90% to enable the higher power density n
Renesas provides a recommended PCB layout guide in their application note (ANXXXX) which includes thermal vias, copper pours, and component placement guidelines to ensure optimal thermal performance.
The IW636-21 has a built-in overcurrent protection feature. To implement it, connect the OCP pin to a resistor divider network that sets the overcurrent threshold. The datasheet provides a calculation formula for the resistor values.
Although the datasheet specifies a maximum operating voltage of 36V, the VIN pin can tolerate up to 40V during startup for a short duration (typically 100ms). However, it's recommended to limit the voltage to 36V for reliable operation.
The IW636-21 is rated for operation up to 125°C. However, for high-temperature applications, it's essential to consider the device's power dissipation, thermal resistance, and PCB design. Renesas provides thermal derating guidelines in the datasheet.
To ensure EMC, follow Renesas' guidelines for PCB layout, component selection, and shielding. Additionally, consider using a common-mode choke and EMI filters on the input and output lines.
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IW636-21 Overview
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