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參數(shù)資料
| 型號： | TPS2552DBV-1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | PLASTIC, SOT-23, 6 PIN |
| 文件頁數(shù)： | 10/32頁 |
| 文件大?。?/td> | 2005K |
| 代理商： | TPS2552DBV-1 |
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UNIVERSAL SERIAL BUS (USB) POWER-DISTRIBUTION REQUIREMENTS
SLVS841C – NOVEMBER 2008 – REVISED SEPTEMBER 2009...................................................................................................................................... www.ti.com
One application for this device is for current limiting in universal serial bus (USB) applications. The original USB
interface was a 12-Mb/s or 1.5-Mb/s, multiplexed serial bus designed for low-to-medium bandwidth PC
peripherals (e.g., keyboards, printers, scanners, and mice). As the demand for more bandwidth increased, the
USB 2.0 standard was introduced increasing the maximum data rate to 480-Mb/s. 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 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 classifies two different classes of
devices depending on its maximum current draw. A device classified as low-power can draw up to 100 mA as
defined by the standard. A device classified as high-power can draw up to 500 mA. It is important that the
minimum current-limit threshold of the current-limiting power-switch exceed the maximum current-limit draw of
the intended application. The latest USB standard should always be referenced when considering the
current-limit threshold
The USB specification defines two types of devices as hubs and functions. A USB hub is a device that contains
multiple ports for different USB devices to connect and can be self-powered (SPH) or bus-powered (BPH). A
function is a USB device that is able to transmit or receive data or control information over the bus. A USB
function can be embedded in a USB hub. A USB function can be one of three types included in the list below.
Low-power, bus-powered function
High-power, bus-powered function
Self-powered function
SPHs and BPHs distribute data and power to downstream functions. The TPS2552/53 has higher current
capability than required for a single USB port allowing it to power multiple downstream ports.
18
Copyright 2008–2009, Texas Instruments Incorporated
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2552DBV1EVM-364 | 功能描述:交換機 IC 開發(fā)工具 TPS2552DBV1EVM-364 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:USB Power Switches 工具用于評估:MAX4984E 工作電源電壓:2.8 V to 5.5 V |
| TPS2552DBVEVM-364 | 功能描述:交換機 IC 開發(fā)工具 TPS2552DBVEVM-364 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:USB Power Switches 工具用于評估:MAX4984E 工作電源電壓:2.8 V to 5.5 V |
| TPS2552DBVR | 功能描述:電源開關(guān) IC - USB Adj Crnt-Ltd Pwr- Dist Sw RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| TPS2552DBVR-1 | 功能描述:電源開關(guān) IC - USB Adj Crnt-Ltd Pwr- Dist Sw RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| TPS2552DBVT | 功能描述:電源開關(guān) IC - USB Adj Crnt-Ltd Pwr- Dist Sw RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
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