IN

OC1

OC2

2

8

3

5

4

7

0.1

µF

10

µF

Internal

Function

OUT1

Power Supply

3.3 V

EN1

6

0.1

µF

10

µF

OUT2

Internal

Function

0.1

µF

10

µF

USB

Control

GND

D−

D+

TPS2062

EN2

GND

1

TPS2061, TPS2062, TPS2063

TPS2065, TPS2066, TPS2067

SLVS490I – DECEMBER 2003 – REVISED OCTOBER 2009

www.ti.com

Figure 28. High-Power Bus-Powered Function

USB POWER-DISTRIBUTION REQUIREMENTS

USB can be implemented in several ways, and, regardless of the type of USB device being developed, several

power-distribution features must be implemented.

•

Hosts/SPHs must:

–

Current-limit downstream ports

–

•

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 TPS206x allows them to meet each of these requirements. The integrated current-limiting

and overcurrent reporting is required by hosts and self-powered hubs. The logic-level enable and controlled rise

times meet the need of both input and output ports on bus-powered hubs, as well as the input ports for

bus-powered functions (see Figure 29).

20

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