TPS2061, TPS2062, TPS2063
TPS2065, TPS2066, TPS2067
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SLVS490B–DECEMBER 2003–REVISED DECEMBER 2004
APPLICATION INFORMATION (continued)
Power Supply
D+
D−
3.3 V
TPS2062
2
8
IN
V
BUS
7
10 µF
0.1 µF
Internal
Function
OUT1
GND
0.1 µF
10 µF
OC1
EN1
OC2
EN2
3
5
USB
Control
6
4
OUT2
GND
Internal
Function
0.1 µF
10 µF
1
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
– Report overcurrent conditions on USB VBUS
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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