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參數(shù)資料
| 型號： | LTC4244 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Rugged, CompactPCI Bus Hot Swap Controllers |
| 中文描述： | 堅固耐用，CompactPCI總線熱插拔控制器 |
| 文件頁數(shù)： | 11/28頁 |
| 文件大?。?/td> | 333K |
| 代理商： | LTC4244 |
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11
LTC4244/LTC4244-1
42441f
APPLICATIOU
Hot Circuit Insertion
When a circuit board is inserted into a live CompactPCI
(CPCI) bus, the supply bypass capacitors can draw huge
inrush currents from the CPCI power bus as they charge
up. These transient currents can create glitches on the
power bus, causing other boards in the system to reset.
The LTC4244 is designed to turn a board’s back-end
supply voltages on and off in a controlled manner, allow-
ing the board to be safely inserted or removed from a live
CPCI connector without glitching the system power sup-
plies. It also protects the system supplies from shorts,
precharges the bus I/O connector pins during hot insertion
and extraction, and monitors the supply voltages.
The LTC4244 is specifically designed for CPCI applica-
tions where the Hot Swap controller resides on the plug-
in board.
W
U
U
LTC4244 Feature Summary
Allows safe insertion and removal from a CPCI back-
plane.
Controls all four CPCI supplies: -12V, 12V, 3.3V and 5V.
Adjustable foldback current limit for the 5V and 3.3V
supplies: an adjustable analog current limit with a value
that depends on the output voltage. If the output is
shorted to ground the current limit drops to keep power
dissipation and supply glitches to a minimum.
12V and –12V circuit breakers: if either supply remains
in analog foldback current limit for more than 25
μ
s, the
circuit breakers will trip, the supplies are turned off and
the FAULT pin is pulled low.
Adjustable 5V and 3.3V circuit breakers: if either supply
exceeds its current limit for more than 25
μ
s, the circuit
breaker will trip, the supplies will be turned off and the
FAULT pin is asserted low. In the event of a short circuit
on either supply, an analog current limit will prevent the
supply current from exceeding three times the circuit
breaker threshold current.
Current limit during power up: the supplies are allowed
to power up in current limit. This allows the LTC4244 to
power up boards with widely varying capacitive loads
without tripping the circuit breaker. The maximum
allowable power-up time is adjustable using the TIMER
pin capacitor.
Internal 12V and –12V power switches.
PWRGD output: monitors the voltage status of the four
back-end supply voltages.
PCI_RST# combined on chip with HEALTHY# to create
LOCAL_PCI_RST# output. Simply connect the
PCI_RST# signal to the RESETIN pin and the
LOCAL_PCI_RST# signal to the open-drain RESETOUT
pin.
Precharge output: on-chip reference and error amplifier
provide 1V for biasing bus I/O connector pins during
CPCI card insertion and extraction.
TIMER/AUX. V
CC
: After power-up, the TIMER pin ca-
pacitor serves as auxiliary V
CC
, thus enabling the
LTC4244 to ride out large voltage spikes on the 12V
IN
supply without interruption.
Undervoltage lockout: All four input voltages are pro-
tected by undervoltage lockouts.
Space saving 20-pin SSOP package.
LTC4244 vs LTC1644
The LTC4244 is pin-for-pin compatible with the LTC1644.
There are, however, some important differences between
the two parts:
TIMER: The LTC4244’s TIMER pin threshold voltage is
1.6V below V
12VIN
vs 1V for the LTC1644. After power-
up, the LTC4244’s TIMER pin also doubles as auxiliary
V
CC
.
V
EEIN
UVL: The LTC4244 has a –9.5V UVL threshold
protecting the V
EEIN
supply. The LTC1644 has no V
EEIN
UVL feature.
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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 |
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| LTC4252-1 | TRANS ARRAY NPN/PNP SS MINI-6P |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4244CGN | 功能描述:IC CTRLR HOTSWAP PCI 20-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)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) |
| LTC4244CGN#PBF | 功能描述:IC CTLR HOT SWAP PCI 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)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) |
| LTC4244CGN#TR | 功能描述:IC CTRLR HOT SWAP CPCI 20-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)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) |
| LTC4244CGN#TRPBF | 功能描述:IC CTRLR HOTSWAP PCI 20-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)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) |
| LTC4244CGN-1 | 制造商:Linear Technology 功能描述:Hot Swap Controller 13.5V/14.4V/-14.4V 20-Pin SSOP N |
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