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參數(shù)資料
| 型號： | LTC4240IGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | CompactPCI Hot Swap Controller with I2C Compatible Interface |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO28 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP28 |
| 文件頁數(shù)： | 24/28頁 |
| 文件大?。?/td> | 486K |
| 代理商： | LTC4240IGN |
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LTC4240
24
4240f
PRSNT1#
Open
Ground
PRSNT2#
Open
10k Pull-Up
Expansion Configuration
No plug in board present
Plug-in board present,
maximum power consumption
Plug-in board present,
nominal power consumption
Plug-in board present,
minimum power consumption
10k Pull-Up
Ground
Ground
Ground
Other CompactPCI Applications
If no 3.3V supply input is required, Figure 15 illustrates
how the LTC4240 should be configured.
For applications where the BD_SEL# connector pin is
grounded on the backplane, the circuit in Figure16 allows
the LTC4240 to be reset simply by pressing a pushbutton
switch on the CPCI plug-in board. This arrangement
allows for manual resetting of the LTC4240’s circuit break-
ers.
Input Transient Protection
Hot-plugging a board into a backplane generates inrush
currents from the backplane power supplies. This is due to
the charging of the plug-in board bulk capacitance. To
reduce this transient current to a safe level, the CPCI Hot
Swap specification restricts the amount of unswitched
capacitance used on the input side of the plug-in board.
Each pin connected to the CPCI female connector on the
plug-in board is allowed at most 0.01
μ
F/pin. Bulk capaci-
tors are only allowed on the switched output side of the
LTC4240 (5V
OUT
, 3V
OUT
, 12V
OUT
, V
EEOUT
). Some bulk
capacitance is allowed on the Early Power planes, but only
because a current limiting resistor is assumed to separate
the connector from the bulk capacitor. Circuits normally
placed on the unswitched Early Power (PCI Bridge, for
example) need to have a current limiting resistor.
APPLICATIU
W
U
U
The assumption by the CompactPCI specification is that
there is a diode to 3.3V on the circuit that is driving the
BD_SEL# pin. The 1.2k resistor pull up to 5V
IN
on the plug-
in card will thus be clamped by the diode to 3.3V. If the
BD_SEL# pin is being driven high, the actual voltage on the
pin will be approximately 3.9V. This is still above the high
TTL threshold of the LTC4240 OFF/ON pin, but low enough
for Q4 to disable the bus switches and thus remove the 10k
resistors from the I/O lines. Note that BD_SEL# is ordi-
narily connected to V(I/O), which in turn is allowed to be
driven by either 3.3V or 5V. For applications such as
shown in Figure 14, the pull up on BD_SEL# is restricted
to the long 5V pins. A bus switch with no internal diode to
V
DD
is preferred. Since the power to the bus switch is
derived from one of the unswitched power planes, a 100
resistor plus a 0.1
μ
series with its power supply.
When the plug-in card is removed from the connector, the
BD_SEL# connection is broken first, and the BD_SEL#
voltage pulls up to 5V. This causes Q4 to turn off, which re-
enables the bus switch, and the precharge resistors are
again connected to the LTC4240 PRECHARGE pin for the
remainder of the board extraction process.
The LTC4240 BE pin can alternatively be used to drive the
enable input of the bus switch. The BE signal would then
keep the I/O lines precharged until all supplies reached
power good status. The resistor in series with the
PRECHARGE pin protects the internal circuitry from large
voltage transients during live insertion.
PRSNT1#, PRSNT2#
PRSNT1# and PRSNT2# are PCI signals that convey the
plug-in board’s power consumption information. These
pins should either be shorted to ground or be connected
to Early Power with a 10k resistor. The voltage levels (TTL)
at the PRSNT#1, 2 pins can be read using the I
2
C 2-wire
interface.
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PDF描述 |
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| LTC4240CGN | CompactPCI Hot Swap Controller with I2C Compatible Interface |
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| LTC4244CGN-1 | Rugged, CompactPCI Bus Hot Swap Controllers |
| LTC4244IGN | Rugged, CompactPCI Bus Hot Swap Controllers |
| LTC4244IGN-1 | Rugged, CompactPCI Bus Hot Swap Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4240IGN#PBF | 功能描述:IC CTRLR HOTSWAP CPCI I2C 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4240IGN#TR | 功能描述:IC CTRLR HOT SWAP CPCI 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4240IGN#TRPBF | 功能描述:IC CTRLR HOTSWAP CPCI I2C 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4241 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:PCI-Bus with 3.3V Auxiliary Hot Swap Controller |
| LTC4241CGN | 功能描述:IC CTRLR HOTSWAP PCI 3.3V 20SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
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