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參數(shù)資料
| 型號： | TPS2211DB |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | SINGLE-SLOT PC CARD POWER INTERFACE SWITCH FOR PARALLEL PCMCIA CONTROLLERS |
| 中文描述： | 單槽PC卡電源接口開關(guān)并聯(lián)的PCMCIA控制器 |
| 文件頁數(shù)： | 16/22頁 |
| 文件大?。?/td> | 357K |
| 代理商： | TPS2211DB |
TPS2211
SINGLE-SLOT PC CARD POWER INTERFACE SWITCH
FOR PARALLEL PCMCIA CONTROLLERS
SLVS156E
–
JULY 1997
–
REVISED JANUARY 2001
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
12-V supply not required
Most PC Card switches use the externally supplied 12 V to power gate drive and other chip functions, which
require that power be present at all times. The TPS2211 offers considerable power savings by using an internal
charge pump to generate the required higher voltages from the 5-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 switch inputs when the 12-V input is not used. Additional power savings are realized by the
TPS2211 during a software shutdown in which quiescent current drops to a maximum of 1
μ
A.
3.3-V low-voltage mode
The TPS2211 will operate in a 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-volts-only modes such as sleep or
pager modes. Note that in these operation modes, the TPS2211 will derive its bias current from the 3.3-V input
pin and only 3.3 V can be delivered to the PC Card.
voltage transitioning requirement
PC Cards are migrating from 5 V to 3.3 V to minimize power consumption, optimize board space, and increase
logic speeds. The TPS2211 meets 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 functions as a power reset
and ensures that sensitive 3.3-V circuitry is not subjected to any residual 5-V charge. The TPS2211 offers a
selectable V
CC
and V
pp
ground state, in accordance with PCMCIA 3.3-V/5-V switching specifications.
output ground switches
PC Card specification requires that V
CC
be discharged within 100 ms. PC Card resistance can not be relied on
to provide a discharge path for voltages stored on PC Card capacitance because of possible high-impedance
isolation by power-management schemes.
power-supply considerations
The TPS2211 has multiple pins for each of its 3.3-V and 5-V power inputs and for the switched AVCC outputs.
Any individual pin can conduct the rated input or output current. Unless all pins are connected in parallel, the
series resistance is significantly higher than that specified, resulting in increased voltage drops and lost power.
It is recommended that all input and output power pins be paralleled for optimum operation.
To increase the noise immunity of the TPS2211, the power supply inputs should be bypassed with a 1-
μ
F
electrolytic or tantalum capacitor paralleled by a 0.047-
μ
F to 0.1-
μ
F ceramic capacitor. It is strongly
recommended that the switched outputs be bypassed with a 0.1-
μ
F, or larger, ceramic capacitor; doing so
improves the immunity of the TPS2211 to electrostatic discharge (ESD). Care should be taken to minimize the
inductance of PCB traces between the TPS2211 and the load. High switching currents can produce large
negative voltage transients, which forward biases substrate diodes, resulting in unpredictable performance.
Similarly, no pin should be taken below
–
0.3 V.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2211IDB | 功能描述:熱插拔功率分布 1A 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 |
| TPS2211IDBG4 | 功能描述:熱插拔功率分布 1A 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 |
| TPS2211IDBR | 功能描述:熱插拔功率分布 1A 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 |
| TPS2211IDBRG4 | 功能描述:熱插拔功率分布 1A 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 |
| 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 |
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