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參數(shù)資料
| 型號(hào)： | 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)： | 18/28頁 |
| 文件大?。?/td> | 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
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
overcurrent and over-temperature protection
PC Cards are inherently subject to damage that can result from mishandling. Host systems require protection
against short-circuited cards that could lead to power supply or PCB-trace damage. Even systems sufficiently
robust to withstand a short circuit would still undergo rapid battery discharge into the damaged PC Card,
resulting in the rather sudden and unacceptable loss of system power. Most hosts include fuses for protection.
The reliability of fused systems is poor, as blown fuses require troubleshooting and repair, usually by the
manufacturer.
The TPS2205 takes a two-pronged approach to overcurrent protection. First, instead of fuses, sense FETs
monitor each of the power outputs. Excessive current generates an error signal that linearly limits the output
current, preventing host damage or failure. Sense FETs, unlike sense resistors or polyfuses, have an advantage
in that they do not add to the series resistance of the switch and thus produce no additional voltage losses.
Second, when an overcurrent condition is detected, the TPS2205 asserts a signal at OC that can be monitored
by the microprocessor to initiate diagnostics and/or send the user a warning message. In the event that an
overcurrent condition persists, causing the IC to exceed its maximum junction temperature, thermal-protection
circuitry activates, shutting down all power outputs until the device cools to within a safe operating region.
12-V supply not required
Most PC Card switches use the externally supplied 12-V V
pp
power for switch-gate drive and other chip
functions, which requires that power be present at all times. The TPS2205 offers considerable power savings
by using an internal charge pump to generate the required higher voltages from the 5-V or 3.3-V input; therefore,
the external 12-V supply can be disabled except when needed for flash-memory functions, thereby extending
battery lifetime. Do not ground the 12-V inputs when the 12-V input is not used. Additional power savings are
realized by the TPS2205 during a software shutdown in which quiescent current drops to a maximum of 1
μ
A.
backward compatibility and 3.3-V low-voltage mode
The TPS2205 is backward compatible with the TPS2201, with the following considerations. Pin 25 (V
DD
on
TPS2201) is a no connect because bias current is derived from either the 3.3-V input pin or the 5-V input pin.
Also, the TPS2205 does not have the APWR_GOOD or BPWR_GOOD VPP
reporting outputs. These are left
as no connects.
The TPS2205 operates in 3.3-V low-voltage mode when 3.3 V is the only available input voltage (V
I(5V)
=0). This
allows host and PC Cards to be operated in low-power 3.3-V-only modes such as sleep modes or pager modes.
Note that in this operation mode, the TPS2205 derives its bias current from the 3.3-V input pin and only 3.3 V
can be delivered to the PC Card. The 3.3-V switch resistance will be increased, but the added switch resistance
should not be critical, because only a small amount of current is delivered in this mode. If 6% (198 mV) is allowed
for the 3.3-V switch voltage drop, a 500 m
switch could deliver over 350 mA to the PC Card.
voltage transitioning requirement
PC Cards, like portables, are migrating from 5 V to 3.3 V to minimize power consumption, optimize board space,
and increase logic speeds. The TPS2205 is designed to meet all combinations of power delivery as currently
defined in the PCMCIA standard. The latest protocol accommodates mixed 3.3-V/5-V systems by first powering
the card with 5 V, then polling it to determine its 3.3-V compatibility. The PCMCIA specification requires that the
capacitors on 3.3-V-compatible cards be discharged to below 0.8 V before applying 3.3-V power. This ensures
that sensitive 3.3-V circuitry is not subjected to any residual 5-V charge and functions as a power reset. The
TPS2205 offers a selectable V
CC
and V
pp
ground state, in accordance with PCMCIA 3.3-V/5-V switching
specifications, to fully discharge the card capacitors while switching between V
CC
voltages.
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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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