Low-power 4-port and 7-port USB 2.0 hub controllers

Low-power 4-port and 7-port USB 2.0 hub controllers

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By Julien Happich

The XR22404 is a 4-port hub controller that can be configured for downstream device charging and supports USB Battery Charging Specification 1.1 and 1.2. It operates from either 3.3V or 5V supplies, allowing bus- or self-powered operation without an external LDO.  Available in a tiny 4x4mm, 24-pin QFN package, the XR22404 also comes in a 28-pin SSOP for less space-constrained applications.
The XR22417 is a 7-port USB 2.0 hub controller that uses Multiple Transaction Translators (MTT) for the highest possible bandwidth. Like the 4-port device in the family, the XR22417 benefits from design optimization that minimizes power, size and cost to meet the challenging constraints facing connectivity and interface designers. The XR22417 is available in a 64-pin LQFP package as well as a smaller 48-pin LQFP. Both chips are compatible with standard software drivers and include LED indicators to simplify implementation.  Both controllers attach to upstream ports at hi-speed (480Mbps) or full-speed (12Mbps).  The downstream PHYs support hi-speed, full-speed and low-speed (1.5Mbps) on each port.
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