Linear Technology’s LTM2884 is a USB μModule isolator that combines USB data communications and USB power, and guards against ground-to-ground differentials and large common mode transients. The rugged interface and isolation make it ideal for systems implementing USB in harsh industrial or medical environments where protection from ground differences is required.
The chip separates grounds by isolating a pair of USB signal transceivers using internal inductive signal isolation, providing 2500 VRMS isolation plus common-mode transient rejection in excess of 30 kV/μs. It integrates a low-EMI, external- or bus-powered DC-DC converter that powers the isolated transceiver and provides up to 2,5 W of isolated power for USB peripherals or hub/host controllers.
The unique automatic bus speed detection feature allows the LTM2884 to be used in hub/host/bus isolation applications. Integrated downstream facing pull-down resistors and upstream facing pull-up resistors are automatically configured to match the speed of the downstream device, enabling the IC to monitor and report bus speeds to the host.
The ±15 kV ESD-protected transceivers operate at USB 2.0 full speed (12 Mbps) and low speed (1,5 Mbps). A suspend mode monitors for inactivity and reduces VBUS current to less than 2 mA. The integrated DC-DC converter is capable of supplying 2,5 W when connected to an external high-voltage supply or 1 W when connected to the USB VBUS supply.
The LTM2884 is available in a 15 x 15 x 5 mm surface mount BGA package in commercial, industrial and automotive versions, supporting operating temperature ranges from 0°C to 70°C, -40°C to 85°C and -40°C to 105°C respectively.
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