參數(shù)資料
型號(hào)： LTC4240IGN#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 17/28頁(yè)
文件大?。?/td> 493K
描述： IC CTRLR HOTSWAP CPCI I2C 28SSOP
標(biāo)準(zhǔn)包裝： 2,500
類(lèi)型： 熱交換控制器
應(yīng)用： CompactPCI?
內(nèi)部開(kāi)關(guān)： 無(wú)
電源電壓： 3.3V，5V，±12V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 28-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 28-SSOP
包裝： 帶卷 (TR)
LTC4240
17
4240f
Note that capacitor C1 performs dual functions. In addi-
tion to controlling the ramp up rates of the 5V and 3.3V
outputs, it also compensates the current limit loop.
Current limit faults are ignored while the TIMER voltage is
less than 5.5V.
Once all four supplies are within tolerance, the PWRGD pin
(HEALTHY#) will be pulled low and LOCAL_PCI_RESET#
(RESETOUT) is free to follow PCI_RST#. Bit 3 of the I
2
C
command latch powers up low, thus not asserting
LOCAL_PCI_RST#.
Power-Down Sequence
When either BD_SEL# (OFF/ON) or Bit 2 of the command
latch (C2) is set high, a power-down sequence begins
(Figure 5).
The TIMER pin is immediately pulled low. The GATE pin
(Pin 19) is pulled down by a 200礎(chǔ) current source to
prevent the load currents on the 3.3V and 5V supplies from
going to zero instantaneously and glitching the power
supply voltages. Internal switches are connected to each
of the output supply voltage pins to discharge the output
bulk capacitors to ground. When any one of the output
voltages drops below its PWRGD threshold, the HEALTHY#
signal pulls high, LOCAL_PCI_RST# (RESETOUT) is as-
serted low, and the external status LED turns on.
Once the power-down sequence is complete the status
LED will light up and the CPCI card may be removed from
the slot. During extraction, the precharge circuit will
continue to bias the bus I/O pins at 1V until the long
connector pin connections are broken.
Early Power
Early Power usage is restricted by the CompactPCI (CPCI)
specification. It is intended to power up the precharge
circuit and I/O cells. The CPCI specification allows any of
the long power pins (5V, 3.3V, V(I/O)) to be used for Early
Power. Since Early Power is not isolated, a resistor should
be placed in series with each CPCI connector pin. Note that
if any Early Power pin is shorted on the inserted card, the
current limiting resistor will dissipate the power.
In order to maximize the DC current available from the 5V
supply, all eight 5V connector pins should be tied together
on the inserted card. The same applies to the ten 3.3V CPCI
connector pins. Early Power should then be drawn from
either or both of the two V(I/O) long pins. If either or both
of 5V and 3.3V is used for Early Power, then the 5V and
3.3V sense resistor values must be chosen such that the
1A/pin CPCI rule is not violated.
Connecting V
EEIN
To lessen the likelihood of faulting on power up, the V
EEOUT
output pin should be bypassed with a capacitor that is only
as large as necessary. A value of 10礔 to 47礔 is recom-
mended. If a large value bypass capacitor is used (e.g.
e100礔) on V
EEOUT
, current limit faults may occur during
power-up or during recovery from power failures.
TIMER
10V/DIV
GATE
10V/DIV
12V
OUT
10V/DIV
V
EEOUT
10V/DIV
5V
OUT
10V/DIV
3V
OUT
10V/DIV
LCL_PCI_RST#
5V/DIV
BD_SEL#
5V/DIV
HEALTHY#
5V/DIV
10ms/DIV
4240 F05
Figure 5. Normal Power-Down Sequence
APPLICATIO  S I FOR  ATIO
U
U
U
相關(guān)PDF資料
PDF描述
LTC4241IGN#PBF IC CTRLR HOTSWAP 3.3V AUX 20SSOP
LTC4242CUHF#TRPBF IC CNTRLR HOT SWAP 38-QFN
LTC4244CGN-1#TRPBF IC CTRLR HOTSWAP PCI 20-SSOP
LTC4245CG#TRPBF IC CNTRLR HOT SWAP 36-SSOP
LTC4251-2CS6#TRPBF IC CTRLR HOTSWAP NEGVOLT SOT23-6
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4241 制造商:LINER 制造商全稱(chēng):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(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 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(lèi)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
LTC4241CGN#PBF 功能描述:IC CTRLR HOTSWAP CPCI I2C 20SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 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(lèi)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
LTC4241CGN#TR 功能描述:IC CTRLR HOTSWAP 3.3V AUX 20SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 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(lèi)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
LTC4241CGN#TRPBF 功能描述:IC PCI-BUS W/HOT SWAP 20SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 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(lèi)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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*