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參數(shù)資料
| 型號： | TPS2157IDGQ |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 3.3-V LDO AND DUAL SWITCH FOR USB BUS-POWERED HUB POWER MANAGEMENT |
| 中文描述： | 3.3V的穩(wěn)壓器和雙USB總線開關(guān)電源的集線器，電源管理 |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 268K |
| 代理商： | TPS2157IDGQ |
TPS2149
TPS2159
SLVS401
–
AUGUST 2001
15
www.ti.com
APPLICATION INFORMATION
universal serial bus (USB) applications (continued)
The TPS2149 and TPS2159 are well suited for USB bus-powered hub applications. The internal LDO can be
used to provide the 3.3 V power needed by the controller while the dual switches distribute power to the
downstream functions.
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/self-powered hubs must:
–
Current-limit downstream ports
–
Report overcurrent conditions on USB V
BUS
Bus-powered hubs must:
–
–
–
Enable/disable power to downstream ports
Power up at <100 mA
Limit inrush current (<44
and 10
μ
F)
Functions must:
–
–
Limit inrush currents
Power up at <100 mA
The feature set of the TPS2149 and TPS2159 is designed to help USB bus-powered hubs meet the
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.
USB applications
Figure 17 shows the TPS2149 being used in a USB bus-powered two-port hub design. The internal 3.3-V LDO
is used to provide power for the USB function controller as well as to the 1.5-k
pullup resistor.
Switches 1 and 2 provide power to the downstream ports. Both are separately enabled to control power being
sent downstream. They are also disabled during enumeration to satisfy the 100 mA requirement.
Figure 18 shows the TPS2149 being used in a USB bus-powered four-port hub design. The internal 3.3-V LDO
is used to provide power for the USB function controller as well as to the 1.5 k
pullup resistor.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2158IDGN | 功能描述:電源開關(guān) IC - USB 3.3V LDO + Dual Switch 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 |
| TPS2158IDGN | 制造商:Texas Instruments 功能描述:Power Distribution Load Switch IC |
| TPS2158IDGNG4 | 功能描述:電源開關(guān) IC - USB 3.3V LDO + Dual Switch 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 |
| TPS2158IDGNR | 功能描述:電源開關(guān) IC - USB 3.3V LDO + Dual Switch 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 |
| TPS2158IDGNRG4 | 功能描述:電源開關(guān) IC - USB 3.3V LDO + Dual Switch 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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