TPS65281, TPS65281-1

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SLVSBH7B – JULY 2012 – REVISED DECEMBER 2012

USB Power Distribution Requirements

USB can be implemented in several ways regardless of the type of USB device being developed. Several power-

distribution features must be implemented.

SPHs must:

•

Current limit downstream ports

•

Report over-current conditions

BPHs must:

•

Enable/disable power to downstream ports

•

Power up at < 100 mA

•

Limit inrush current (< 44

Ω and 10 µF)

Functions must:

•

Limit inrush currents

•

Power up at < 100 mA

The feature set of the TPS65281 meets each of these requirements. The integrated current limiting and over-

current reporting is required by self-powered hubs. The logic-level enable and controlled rise times meet the

need of both input and output ports on bus-powered hubs and the input ports for bus-powered functions.

Copyright © 2012, Texas Instruments Incorporated

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Product Folder Links: TPS65281 TPS65281-1