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參數(shù)資料
| 型號： | TPS2212DB |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | SINGLE-SLOT, PARALLEL INTERFACE POWER SWITCH FOR LOW POWER PC CARD SLOTS |
| 中文描述： | 單槽，并行接口電源開關(guān)的低功率的PC卡插槽 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 296K |
| 代理商： | TPS2212DB |
TPS2212
SINGLE-SLOT, PARALLEL INTERFACE POWER SWITCH
FOR LOW POWER PC CARD SLOTS
SLVS193 – APRIL 1999
13
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, GPS systems,
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 (Personal Computer Memory Card International Association) was established,
comprised of members from leading computer, software, PC Card, and semiconductor manufacturers. One key
goal was to realize the plug and playconcept, i.e. cards and hosts from different vendors should be compatible.
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 the 68 terminals of the PC Card connectors. This power interface consists of two VCC, two VPP, and
four ground terminals. Multiple VCC and ground terminals minimize connector-terminal and line resistance. The
two VPP 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 VCC terminals;
flash-memory programming and erase voltage is supplied through the VPP terminals.
designing for voltage regulation
The current PCMCIA specification for output voltage regulation of the 5-V output is 5% (250 mV). In a typical
PC power-system design, the power supply will have 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 TPS2212 is the PCMCIA
voltage regulation less the power supply regulation and less the PCB and connector resistive drops:
V
DS
V
O reg
– V
PS reg
– V
PCB
Typically, this would leave 100 mV for the allowable voltage drop across the TPS2212. The voltage drop is the
output current multiplied by the switch resistance of the TPS2212. Therefore, the maximum output current that
can be delivered to the PC Card in regulation is the allowable voltage drop across the TPS2212 divided by the
output switch resistance.
I
O
max
V
DS
r
DSon
The VCC outputs deliver 250 mA continuous at 5 V and 3.3 V within regulation over the operating temperature
range. Using the same equations, the PCMCIA specification for output voltage regulation of the 3.3 V output
is 300 mV. Using the voltage drop percentages for power supply regulation (2%) and PCB resistive loss (1%),
the allowable voltage drop for the 3.3 V switch is 200 mV. The 12-V outputs (VPP) of the TPS2212 can deliver
150 mA continuously.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2212IDB | 功能描述:熱插拔功率分布 0.3A Sngl-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 |
| TPS2212IDBG4 | 功能描述:熱插拔功率分布 0.3A Sngl-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 |
| TPS2212IDBR | 功能描述:熱插拔功率分布 0.3A Sngl-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 |
| TPS2212IDBRG4 | 功能描述:熱插拔功率分布 0.3A Sngl-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 |
| TPS2214 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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