Exar Delivers Power Distribution Switch for USB 3.0 and USB 2.0 Hubs

Exar Corporation announced the XRP2523, a single channel switch for USB V(BUS) power distribution applications.

The XRP2523 is compliant with the latest USB 3.0 specification as well
as the established USB 2.0 specification. The new specification provides
higher power to the downstream peripherals and enables more efficient
battery charging over USB.

The XRP2523 manages all aspects of the V(BUS) power distribution,
providing a low on-resistance to meet the USB voltage regulation
requirement, controlling transients during turn-on and hot plugging
events and handling all fault conditions such as over current, short
circuit or over temperature. The XRP2523 interfaces with any USB
controller through an active-high enable logic and channel fault flag.

"Issues revolving around the controlled power distribution and the
protection of both the host power supply and the peripheral are key
elements of designing reliable equipment with a USB compliant port," said Eric Pittana, Exar’s Power Management marketing director. "Given
the growing trend to power and charge portable devices via USB, we
expect management of the extra power provided by a USB 3.0 compliant
port and the increased reliability to be key requirements for numerous
applications."

Product Details
The XRP2523 is a compact single channel power distribution switch
supporting a 3.2V to 6.5V input voltage range. With a low 85mO
on-resistance, this device is capable of delivering up to 1.5A of
continuous load current while meeting USB requirements for voltage drop
and regulation. An integrated soft-start function controls turn-on
transients. Built-in over current, a 1.6A over current limit, under
voltage lockout (UVLO), reverse current, short circuit and over
temperature features, protect both the hub and the peripheral from any
abnormal operating conditions. False fault detections are masked from
the USB controller through a 9ms blanking of the error flag. An
active-high control logic also allows the controller full control on the
XRP2523 on/off state.

Product Availability and Pricing
The XRP2523 is available in volume quantities and comes standard
in a RoHS compliant, halogen free 5-pin SOT-23 package. The 1,000-unit
suggested retail is $0.69 each.  Exar also offers an evaluation board
for customers to test the features of the XRP2523.