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參數(shù)資料
| 型號： | TPS2205DF |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DUAL-SLOT PC CARD POWER-INTERFACE SWITCH FOR PARALLEL PCMCIA CONTROLLERS |
| 中文描述： | 雙插槽PC卡電源接口開關(guān)并聯(lián)的PCMCIA控制器 |
| 文件頁數(shù)： | 17/28頁 |
| 文件大小： | 463K |
| 代理商： | TPS2205DF |
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TPS2205
DUAL-SLOT PC CARD POWER-INTERFACE SWITCH
FOR PARALLEL PCMCIA CONTROLLERS
SLVS128D OCTOBER 1995 – REVISED JUNE 1998
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
overview
PC Cards were initially introduced as a means to add EEPROM (flash memory) to portable computers with
limited on-board memory. The idea of add-in cards quickly took hold; modems, wireless LANs, global positioning
satellite system (GPS), multimedia, and hard-disk versions were soon available. As the number of PC Card
applications grew, the engineering community quickly recognized the need for a standard to ensure
compatibility across platforms. To this end, the PCMCIA was established, comprised of members from leading
computer, software, PC Card, and semiconductor manufacturers. One key goal was to realize the
“plug-and-play” concept. Cards and hosts from different vendors should be compatible — able to communicate
with one another transparently.
PC Card power specification
System compatibility also means power compatibility. The most current set of specifications (PC Card Standard)
set forth by the PCMCIA committee states that power is to be transferred between the host and the card through
eight of 68 terminals of the PC Card connector. This power interface consists of two V
CC
, two V
pp
, and four
ground terminals. Multiple V
CC
and ground terminals minimize connector-terminal and line resistance. The two
V
pp
terminals were originally specified as separate signals, but are commonly tied together in the host to form
a single node to minimize voltage losses. Card primary power is supplied through the V
CC
terminals;
flash-memory programming and erase voltage is supplied through the V
pp
terminals.
designing for voltage regulation
The current PCMCIA specification for output-voltage regulation (V
O(reg)
) of the 5-V output is 5% (250 mV). In
a typical PC power-system design, the power supply has an output-voltage regulation (V
PS(reg)
) of 2% (100 mV).
Also, a voltage drop from the power supply to the PC Card will result from resistive losses (V
PCB
) in the PCB
traces and the PCMCIA connector. A typical design would limit the total of these resistive losses to less than
1% (50 mV) of the output voltage. Therefore, the allowable voltage drop (V
DS
) for the TPS2205 would be the
PCMCIA voltage regulation less the power supply regulation and less the PCB and connector resistive drops:
VDS
VO reg–VPS reg–VPCB
Typically, this would leave 100 mV for the allowable voltage drop across the TPS2205. The voltage drop is the
output current multiplied by the switch resistance of the TPS2205. Therefore, the maximum output current that
can be delivered to the PC Card in regulation is the allowable voltage drop across the TPS2205 divided by the
output switch resistance.
VDS
rDSon
IOmax
The xVCC outputs have been designed to deliver 700 mA at 5 V within regulation over the operating temperature
range. Current proposals for the PCMCIA specifications are to limit the power dissipated in the PCMCIA slot
to 3 W. With an input voltage of 5 V, 700 mA continous is the maximum current that can be delivered to the PC
Card. The TPS2205 is capable of delivering up to 1 A continuously, but during worst-case conditions the output
may not be within regulation. This is generally acceptable because the majority of PC Cards require less than
700 mA continuous. Some cards require higher peak currents (disk drives during initial platter spin-up), but it
is generally acceptable for small voltage sags to occur during these peak currents.
The xVCC outputs have been designed to deliver 1 A continuously at 3.3 V within regulation over the operating
temperature range. The PCMCIA specification for output voltage regulation of the 3.3-V output is 300 mV. Using
the voltage drop percentages (2%) for power supply regulation and PCB resistive loss (1%), the allowable
voltage drop for the 3.3 V switch is 200 mV.
The xVPP outputs have been designed to deliver 150 mA continuously at 12 V.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2205IDAP | 功能描述:熱插拔功率分布 1A Dual-Slot PC Card Power Switch RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2205IDAP | 制造商:Texas Instruments 功能描述:IC PCMCIA PWR I/F SW 32-TSSOP 制造商:Texas Instruments 功能描述:IC, PCMCIA PWR I/F SW 32-TSSOP |
| TPS2205IDAPG4 | 功能描述:熱插拔功率分布 1A Dual-Slot PC Card Pwr Sw RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2205IDAPR | 功能描述:熱插拔功率分布 1A Dual-Slot PC Card Power Switch RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2205IDAPRG4 | 功能描述:熱插拔功率分布 1A Dual-Slot PC Card Power Switch RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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