參數(shù)資料
型號(hào)： TPS2216ADBRG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30
封裝： GREEN, PLASTIC, MO-150, SSOP-30
文件頁(yè)數(shù)： 11/30頁(yè)
文件大?。?/td> 554K
代理商： TPS2216ADBRG4
TPS2214A, TPS2216A
DUALSLOT PC CARD POWER SWITCHES
FOR SERIAL PCMCIA CONTROLLERS
SLVS267C DECEMBER 1999 REVISED FEBRUARU 2008
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
designing for voltage regulation (continued)
overcurrent and overtemperature 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 robust
enough 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.
However, the reliability of fused systems is poor, as blown fuses require troubleshooting and repair, usually by
the manufacturer.
The TPS2214A and TPS2216A take a two-pronged approach to overcurrent protection, which is designed to
activate if an output is shorted or when an overcurrent condition is present when switches are powered up. First,
instead of fuses, sense FETs monitor each of the xVCC and xVPP power 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. Excessive current generates an error signal
that limits the output current of only the affected output, preventing damage to the host. Each xVCC output
overcurrent limits from 1 A to 2.2 A, typically around 1.6 A; the xVPP outputs limit from 250 mA to 500 mA,
typically around 375 mA.
Second, when an overcurrent condition is detected, these devices assert an active low OC signal that can be
monitored by the microprocessor or controller 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. This shuts down all power outputs until the device cools to within a safe
operating region, which is ensured by a thermal shutdown hysteresis.
12-V supply not required
Many PC Card switches use the externally supplied 12 V to power gate drive and other chip functions; this
requires that power be present at all times. The TPS2214A and TPS2216A offer considerable power savings
by using an internal charge pump to generate the required higher gate drive voltages from the 5-V or 3.3-V
power supplies. Therefore, the external 12-V supply can be disabled except when needed for flash-memory
functions, thereby extending battery lifetime. Additional power savings are realized by the IC during shutdown
mode, in which quiescent current drops to a maximum of 1
A.
3.3-V low-voltage mode
The TPS2214A and TPS2216A will operate in 3.3-V low-voltage mode when 3.3 V is the only available input
voltage (VI(5V) = 0, VI(12V) = 0). This feature allows host and PC Cards to be operated in low-power 3.3-V-only
modes such as sleep modes. Note that in this operation mode, the IC will derive its bias current from the 3.3-V
input pin and can only provide 3.3 V to the outputs.
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 TPS2214A and TPS2216A 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 action
ensures that sensitive 3.3-V circuitry is not subjected to any residual 5-V charge and functions as a power reset.
PC Card specification requires that VCC 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. The TPS2214A and TPS2216A include discharge transistors on all
xVCC and xVPP outputs to meet the specification requirement.
相關(guān)PDF資料
PDF描述
TPS2216ADAPR 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO32
TPS2216IDB 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30
TPS2216IDBR 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30
TPS2216IDAP 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO32
TPS2220BPWPRG4 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS2216DAP 功能描述:熱插拔功率分布 PCMCIA 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
TPS2216DAPG4 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
TPS2216DAPR 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
TPS2216DAPRG4 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
TPS2216DB 功能描述:熱插拔功率分布 Dual PCMCIA 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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