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參數(shù)資料
| 型號(hào)： | TPS2202AIDFR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30 |
| 封裝： | PLASTIC, SSOP-30 |
| 文件頁數(shù)： | 5/28頁 |
| 文件大?。?/td> | 605K |
| 代理商： | TPS2202AIDFR |
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TPS2202AI
DUAL-SLOT PC CARD POWER-INTERFACE SWITCH
WITH RESET FOR SERIAL PCMCIA CONTROLLER
SLVS123B – SEPTEMBER 1995 – REVISED JANUARY 2001
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-play concept. Cards and hosts from different vendors should be compatible
and 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 the PC Card connector’s 68 terminals. 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. As each terminal is rated
to 0.5 A, VCC and Vpp can theoretically supply up to 1 A, assuming equal terminal resistance and no terminal
failure. A conservative design would limit current to 500 mA. Some applications, however, require higher VCC
currents. Disk drives, for example, may need as much as 750-mA peak current to create the initial torque
necessary to spin up the platter. Vpp currents, on the other hand, are defined by flash-memory programming
requirements, typically under 120 mA.
future power trends
The 1-A physical-terminal current alluded to in the PC Card specification has caused some host-system
engineers to believe they are required to deliver 1 A within the voltage tolerance of the card. Future applications,
such as RF cards, could use the extra power for their radio transmitters. The 5 W required for these cards require
very robust power supplies and special cooling considerations. The limited number of host sockets that are able
to support cards makes the market for these high-powered PC Cards uncertain. The vast majority of the cards
require less than 600 mA continuous current, and the trend is towards even lower powered PC Cards that assure
compatibility with a greater number of host systems. Recognizing the need for power derating, an ad hoc
committee of the PCMCIA is currently working to limit the amount of steady-state dc current to the
PC Card to something less than the currently implied 1 A. When a system is designed to support 1 A, the switch
rDS(on), power-supply requirements, and PC Card cooling need to be carefully considered.
designing around 1-A delivery
Delivering 1 A means minimizing voltage and power losses across the PC Card power interface, which requires
that designers trade off switch resistance and the cost associated with large-die (low rDS(on)) MOSFET
transistors. The PC Card standard requires that 5 V
±5% or 3.3 V ±0.3 V be supplied to the card. The
approximate 10% tolerance for the 3.3-V supply makes the 3.3-V rDS(on) less critical than the 5-V switch. A
conservative approach is to allow 2% for voltage-regulator tolerance and 1% for etch- and pin-resistance drops,
which leaves 2% (100 mV) for voltage drop at the 5-V switch and at least 6% (198 mV) for the 3.3-V switch.
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| TPS2202AIDBRG4 | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30 |
| TPS2202IDB | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30 |
| TPS2204APWPRG4 | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24 |
| TPS2205IDBR | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30 |
| TPS2205IDF | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2202IDBLE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| TPS2202IDBR | 制造商:Rochester Electronics LLC 功能描述:DUAL PCMCIA POWER INTERFACE CONTROLLER - Bulk 制造商:Texas Instruments 功能描述: |
| TPS2202IDF | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| TPS2202IDFLE | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| TPS2202IDFR | 功能描述:電源開關(guān) IC - 配電 1A Dual-Slot PC Card w/Serial Interface RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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