參數(shù)資料
型號(hào)： LTC4244CGN-1#TRPBF
廠商： Linear Technology
文件頁數(shù)： 8/28頁
文件大小： 337K
描述： IC CTRLR HOTSWAP PCI 20-SSOP
標(biāo)準(zhǔn)包裝： 2,500
類型： 熱交換控制器
應(yīng)用： CompactPCI?
內(nèi)部開關(guān)： 無
電源電壓： 3.3V，5V，±12V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 20-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 20-SSOP
包裝： 帶卷 (TR)
8
LTC4244/LTC4244-1
42441f
RESETOUT (Pin 10): Open-Drain Digital Output. Connect
the CPCI_LOCAL_RST# signal to the RESETOUT pin.
RESETOUT is the logical combination of the RESETIN and
PWRGD.
DRIVE (Pin 11): Precharge Base Drive Output. Provides
base drive for an external NPN emitter-follower that in turn
biases the PRECHARGE node.
PRECHARGE (Pin 12): Precharge Monitor Input. An inter-
nal error amplifier servos the DRIVE pin voltage to keep the
PRECHARGE node at 1V. See Applications Information for
generating voltages other than 1V. If not used, tie the
PRECHARGE pin to ground.
5V
IN
 (Pin 13): 5V Supply Sense Input. An undervoltage
lockout circuit prevents the switches from turning on
when the voltage at the 5V
IN
 pin is less than 4.25V.
5V
SENSE
 (Pin 14): 5V Current Limit Sense. With a sense
resistor placed in the supply path between 5V
IN
  and
5V
SENSE
, the GATE pin voltage will be adjusted to maintain
a constant 51mV across the sense resistor and a constant
current through the switch while the TIMER pin is low. A
foldback feature makes the current limit decrease as the
voltage at the 5V
OUT
  pin approaches GND. When the
TIMER pin is high, the circuit breaker function is enabled.
If the voltage across the sense resistor exceeds 52mV, the
circuit breaker is tripped after a 25祍 time delay. In the
event of a short-circuit or large overcurrent transient
condition, the GATE pin voltage will be adjusted to main-
tain a constant 150mV across the sense resistor and a
constant current through the switch.
GATE (Pin 15): High Side Gate Drive for the External 3.3V
and 5V N-Channel Pass Transistors. An external series RC
network is required for current limit loop compensation
and setting the minimum ramp-up time. During power-up,
the slope of the voltage rise at the GATE is set by the 67礎(chǔ)
current source connected through a Schottky diode to
12V
IN
 and the external capacitor connected to GND (C1 in
Figure 1) or by the 3.3V or 5V current limit and the bulk
capacitance in the 3.3V
OUT
 or 5V
OUT
 supply lines. During
power down, the slew rate of the GATE voltage is set by the
60礎(chǔ) current source connected to GND and the external
GATE capacitor (C1 in Figure 1).
The voltage at the GATE pin will be modulated to maintain
a constant current when either the 5V or 3.3V supplies go
into current limit. In the event of an overcurrent fault, the
GATE pin is immediately pulled to GND.
3.3V
SENSE
 (Pin 16): 3.3V Current Limit Sense. With a
sense resistor placed in the supply path between 3.3V
IN
and 3.3V
SENSE
, the GATE pin voltage will be adjusted to
maintain a constant 51mV across the sense resistor and a
constant current through the switch while the TIMER pin
is low. A foldback feature makes the current limit decrease
as the voltage at the 3.3V
OUT
 pin approaches GND. When
the TIMER pin is high, the circuit breaker function is
enabled. If the voltage across the sense resistor exceeds
52mV, the circuit breaker is tripped after a 25祍 time delay.
In the event of a short-circuit or large overcurrent transient
condition, the GATE pin voltage will be adjusted to main-
tain a constant 150mV across the sense resistor and a
constant current through the switch.
If no 3.3V input supply is available, short the 3.3V
SENSE
 pin
to the 5V
IN
 pin.
U
U
PI FU CTIO S
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參數(shù)描述
LTC4244IGN 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(biāo)準(zhǔn)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)
LTC4244IGN#PBF 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(biāo)準(zhǔn)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)
LTC4244IGN#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(biāo)準(zhǔn)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)
LTC4244IGN#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(biāo)準(zhǔn)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)
LTC4244IGN-1 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(biāo)準(zhǔn)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)
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