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TPS2070 Datasheet(PDF) 24 Page - Texas Instruments

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Part # TPS2070
Description  FOUR-PORT USB HUB POWER CONTROLLERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS2070 Datasheet(HTML) 24 Page - Texas Instruments

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TPS2070, TPS2071
FOUR-PORT USB HUB POWER CONTROLLERS
SLVS287A – SEPTEMBER 2000 – REVISED FEBRUARY 2001
24
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
universal serial bus (USB) applications
The universal serial bus (USB 1.1) interface is a 12-Mb/s, 1.5-Mb/s, or 480 Mb/s (USB 2.0), multiplexed serial
bus designed for low-to-medium bandwidth PC peripherals (e.g., keyboards, printers, scanners, and mice). The
four-wire USB interface is conceived for dynamic attach-detach (hot plug-unplug) of peripherals. Two lines are
provided for differential data, and two lines are provided for 5-V power distribution.
USB data is a 3.3-V-level signal, but power is distributed at 5 V to allow for voltage drops in cases where power
is distributed through more than one hub or across long cables. Each function must provide its own regulated
3.3 V from the 5-V input or its own internal power supply.
The USB specification defines the following five classes of devices, each differentiated by power-consumption
requirements:
D Hosts/self-powered hubs (SPH)
D Bus-powered hubs (BPH)
D Low-power, bus-powered functions
D High-power, bus-powered functions
D Self-powered functions
Self-powered and bus-powered hubs distribute data and power to downstream functions. The TPS2070 and
TPS2071 can provide power-distribution solutions for hybrid hubs that need switching between BPH and SPH
according to power availability and application requirements.
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 TPS2070 and TPS2071 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


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