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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)： | 8/28頁 |
| 文件大小： | 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
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
power-supply considerations (continued)
The TPS2202AI, unlike other PC Card power-interface switches, does not use the 12-V power supply for
switching or other chip functions. Instead, an internal charge pump generates the necessary voltage from VDD,
allowing the 12-V input supply to be shut down except when the Vpp programming or erase voltage is needed.
Careful system design using this feature reduces power consumption and extends battery lifetime.
The 3.3-V power input should not be taken higher than the 5-V input. Though doing so is nondestructive, this
results in high current flow into the device and could result in abnormal operation. In any case, this occurrence
indicates a malfunction of one input voltage or both, which should be investigated.
Similarly, no pin should be taken below – 0.3 V; forward biasing the parasitic-substrate diode results in substrate
currents and unpredictable performance.
RESET or RESET inputs
To ensure that cards are in a known state after power brownouts or system initialization, the PC Cards should
be reset at the same time as the host by applying a low impedance to the VCC and Vpp terminals. A
low-impedance output state allows discharging of residual voltage remaining on PC Card filter capacitance,
permitting the system (host and PC Cards) to be powered up concurrently. The RESET or RESET input will close
internal switches S1, S4, S7, and S10 with all other switches left open (see TPS2202AI control-logic table). The
TPS2202AI remains in the low-impedance output state until the signal is deasserted and further data is clocked
in and latched. RESET or RESET is provided for direct compatibility with systems that use either an active-low
or active-high reset voltage supervisor. The unused pin is internally pulled up or down and should be left
unconnected.
overcurrent and thermal protection
The TPS2202AI uses sense FETs to check for overcurrent conditions in each of the VCC and Vpp outputs. Unlike
sense resistors or polyfuses, these FETs do not add to the series resistance of the switch; therefore, voltage
and power losses are reduced. Overcurrent sensing is applied to each output separately. When an overcurrent
condition is detected, only the power output affected is limited; all other power outputs continue to function
normally. The OC indicator, normally a logic high, is a logic low when any overcurrent condition is detected,
providing for initiation of system diagnostics and/or sending a warning message to the user.
During power up, the TPS2202AI controls the rise time of the VCC and Vpp outputs and limits the current into
a faulty card or connector. If a short circuit is applied after power is established (e.g., hot insertion of a bad card),
current is initially limited only by the impedance between the short and the power supply. In extreme cases, as
much as 10 A to 15 A may flow into the short before the current limiting of the TPS2202AI engages. If the VCC
or Vpp outputs are driven below ground, the TPS2202AI may latch nondestructively in an off state. Cycling power
will reestablish normal operation.
Overcurrent limiting for the VCC outputs is designed to activate, if powered up, into a short in the range of
0.75 A to 1.9 A, typically at about 1.3 A. The Vpp outputs limit from 120 mA to 400 mA, typically around 200 mA.
The protection circuitry acts by linearly limiting the current passing through the switch rather than initiating a full
shutdown of the supply. Shutdown occurs only during thermal limiting.
Thermal limiting prevents destruction of the IC from overheating if the package power-dissipation ratings are
exceeded. Thermal limiting disables all power outputs (both A and B slots) until the device has cooled.
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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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