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參數(shù)資料
| 型號(hào)： | TPS2148IDGNR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 16/18頁 |
| 文件大?。?/td> | 251K |
| 代理商： | TPS2148IDGNR |
TPS2148
TPS2158
SLVS373
–
AUGUST 2001
16
www.ti.com
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.
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
USB applications
Figure 17 shows the TPS2148 being used in a USB bus-powered peripheral 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.
Switch 1 provides power to the 5-V circuitry which is only enabled after enumeration is complete to ensure
meeting the 100-mA USB power up requirement. Switch 2 provides power to the 3.3-V circuitry. Switch 2 is also
enabled only after enumeration is complete to satisfy the 100 mA requirement.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2149IDGN | 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 |
| TPS2149IDGN | 制造商:Texas Instruments 功能描述:IC 3.3V LDO/DUAL SWITCH 8-MSOP 制造商:Texas Instruments 功能描述:IC, 3.3V LDO/DUAL SWITCH 8-MSOP |
| TPS2149IDGNG4 | 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 |
| TPS2149IDGNR | 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 |
| TPS2149IDGNRG4 | 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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