參數(shù)資料
型號(hào)： LTC4244IGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： Rugged, CompactPCI Bus Hot Swap Controllers
中文描述： 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20
封裝： 0.150 INCH, PLASTIC, SSOP-20
文件頁(yè)數(shù)： 16/28頁(yè)
文件大?。?/td> 333K
代理商： LTC4244IGN
16
LTC4244/LTC4244-1
42441f
immediately to its I
LIMIT
value. If that supply remains in
current limit for more than 25
μ
s, all of the supplies will be
latched off. The 25
μ
s prevents quick current spikes—for
example, from a fan turning on—from causing false trips
of the circuit breaker.
After power-up, the 5V and 3.3V supplies are protected
from short circuits by dual-level circuit breakers. In the
event that either supply’s current exceeds the nominal
current limit, an internal timer is started. If the supply is
still overcurrent after
25
μ
s, the circuit breaker trips and all
the supplies are turned off (Figure 5). An analog current
limit loop prevents the supply current from exceeding 3
×
the nominal current limit in the event of a short circuit
(Figure 6). The LTC4244 will stay in the latched off state
until the OFF/ON pin is cycled high then low or the 12V
IN
power supply is cycled low then high.
The current limit and the foldback current level for the 5V
and 3.3V outputs are both a function of the external sense
resistor. As shown in Figure 1, a sense resistor is con-
nected between 5V
IN
and 5V
SENSE
for the 5V supply. For
the 3.3V supply, a sense resistor is connected between
3.3V
IN
and 3.3V
SENSE
. The typical current limit and the
foldback current levels are given by Equations 6 and 7:
I
mV
R
LIMIT VOUT
(
n
SENSE VOUT
(
)
)
n
=
51
(6)
I
mV
R
FOLDBACK VOUT
SENSE VOUT
(
(
)
)
n
n
=
16
(7)
where nV
OUT
= 5V
OUT
or 3.3V
OUT
.
The current limit for the internal 12V switch is set at
850mA folding back to 360mA and the –12V switch at
610mA folding back to 225mA.
APPLICATIOU
W
U
U
GATE
20V/DIV
5V
10V/DIV
FAULT
5V/DIV
TIMER
20V/DIV
5V
IN
– 5V
100mV/DIV
10
μ
s/DIV
4244 F05
Figure 5. Overcurrent Fault on 5V Output
GATE
20V/DIV
3.3V
5V/DIV
FAULT
5V/DIV
TIMER
20V/DIV
3V
IN
– 3V
500mV/DIV
10
μ
s/DIV
4244 F06
Figure 6. Short-Circuit Fault on 3.3V Output
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(kāi)關(guān):無(wú) 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(yè)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(kāi)關(guān):無(wú) 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(yè)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(kāi)關(guān):無(wú) 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(yè)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(kāi)關(guān):無(wú) 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(yè)面:1423 (CN2011-ZH PDF)
LTC4244IGN-1#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(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(kāi)關(guān):無(wú) 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(yè)面:1423 (CN2011-ZH PDF)
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