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TPS2074 Datasheet(PDF) 21 Page - Texas Instruments

Part No. TPS2074
Description  FOUR-PORT USB HUB POWER CONTROLLERS
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPS2074 Datasheet(HTML) 21 Page - Texas Instruments

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TPS2074, TPS2075
FOUR-PORT USB HUB POWER CONTROLLERS
SLVS288A – SEPTEMBER 2000 – REVISED FEBRUARY 2001
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
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.
D Hosts/self-powered hubs must:
Current-limit downstream ports
Report overcurrent conditions on USB VBUS
Output 5.25 V to 4.75 at 500 mA
D Bus-powered hubs must:
Enable/disable power to downstream ports
Power up at <100 mA
Limit inrush current (<44
Ω and 10 µF)
Output 5.25 V to 4.4 at 100 mA
Not send power back upstream
D Functions must:
Limit inrush currents
Power up at <100 mA
Not send power back upstream (SP functions)
The feature set of the TPS2074 and TPS2075 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 needs of both input and output ports on hubs, as well as the input ports for
bus-powered functions
USB hybrid hub
A USB hybrid hub can be simply implemented using the TPS2075 USB power controller and a TUSB2046 USB
hub controller as shown in Figure 33. The TPS2075 USB power controller provides all the power needs to the
four downstream ports and meets all the USB power specifications for both self-powered hubs and bus-powered
hubs. The power controllers integrated 3.3-V LDO is used to provide power for the hub controller and any other
local functions (e.g. transient suppressor SN75240 ), which saves board space and cost. The TPS2075 also
provides the hub controller with a power good (PG) signal that connects to the RESET input of the hub controller
to automatically reinitialize the hub when switching between self-powered mode and bus-powered mode
whenever the self-power supply is connected or disconnected. The amount of time in which the hub controller
is kept in a reset state is controlled by a capacitor connected between the PG_DLY pin of the power controller
and ground.


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