參數(shù)資料
型號(hào)： TPS2202AIDBR
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30
封裝： GREN, PLASTIC, SSOP-30
文件頁(yè)數(shù)： 7/28頁(yè)
文件大?。?/td> 605K
代理商： TPS2202AIDBR
TPS2202AI
DUAL-SLOT PC CARD POWER-INTERFACE SWITCH
WITH RESET FOR SERIAL PCMCIA CONTROLLER
SLVS123B – SEPTEMBER 1995 – REVISED JANUARY 2001
15
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
12-V supply not required
Most PC Card switches use the externally supplied 12-V Vpp power for switch-gate drive and other chip
functions, which requires that power be present at all times. The TPS2202AI offers considerable power savings
by using an internal charge pump to generate the required higher voltages from the 5-V VDD supply; 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 12-V supply is not in use. Additional power savings are
realized by the TPS2202AI during a software shutdown in which quiescent current drops to a maximum of
1
A.
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 TPS2202AI 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
TPS2202AI offers a selectable VCC and Vpp ground state, in accordance with PCMCIA 3.3-V/5-V switching
specifications, to fully discharge the card capacitors while switching between VCC voltages.
output ground switches
Several PCMCIA power-distribution switches on the market do not have an active-grounding FET switch. These
devices do not meet the PC Card specification requiring a discharge of VCC 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. A method commonly shown to alleviate this
problem is to add to the switch output an external 100-k
resistor in parallel with the PC Card. Considering that
this is the only discharge path to ground, a timing analysis will reveal that the RC time constant delays the
required discharge time to more than 2 seconds. The only way to ensure timing compatibility with PC Card
standards is to use a power-distribution switch that has an internal ground switch, like that of the TPS22xx family,
or add an external ground FET to each of the output lines with the control logic necessary to select it.
In summary, the TPS2202AI is a complete single-chip dual-slot PC Card power interface. It meets all currently
defined PCMCIA specifications for power delivery in 5-V, 3.3-V, and mixed systems, and offers a serial controller
interface. The TPS2202AI offers functionality, power savings, overcurrent and thermal protection, and fault
reporting in one 30-pin SSOP surface-mount package for maximum value added to new portable designs.
power-supply considerations
The TPS2202AI has multiple pins for each of its 3.3-V, 5-V, and 12-V power inputs and for the switched VCC
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. Both 12-V inputs must be connected for proper Vpp switching; it is recommended that all input and
output power pins be paralleled for optimum operation. The VDD input lead must be connected to the 5-V input
leads.
Although the TPS2202AI is fairly immune to power input fluctuations and noise, it is generally considered good
design practice to bypass power supplies typically with a 1-
F electrolytic or tantalum capacitor paralleled by
a 0.047-
F to 0.1-F ceramic capacitor. It is strongly recommended that the switched VCC and Vpp outputs be
bypassed with a 0.1-
F or larger capacitor; doing so improves the immunity of the TPS2202AI to electrostatic
discharge (ESD). Care should be taken to minimize the inductance of PCB traces between the TPS2202AI and
the load. High switching currents can produce large negative-voltage transients, which forward biases substrate
diodes, resulting in unpredictable performance.
相關(guān)PDF資料
PDF描述
TPS2202AIDFR 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS2202AIDBRG4 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface 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
TPS2202AIDF 制造商:Rochester Electronics LLC 功能描述:DUAL PCMCIA POWER INTERFACE CONTROLLER - Bulk
TPS2202AIDFLE 制造商:Rochester Electronics LLC 功能描述:- Bulk
TPS2202AIDFR 功能描述:熱插拔功率分布 1A Dual-Slot PC Card w/Serial Interface 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
TPS2202IDBLE 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
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