參數(shù)資料
型號(hào)： LTC4244CGN-1
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)： 24/28頁(yè)
文件大?。?/td> 333K
代理商： LTC4244CGN-1
24
LTC4244/LTC4244-1
42441f
OUTPUT VOLTAGE (V)
0
D
15
20
25
4
4244 F16
10
5
0
1
2
3
5
5V MOSFET
5V R
SENSE
= 0.007
3.3V R
SENSE
= 0.005
3.3V MOSFET
Figure 16. Worst-Case 5V and 3.3V MOSFET
Dissipated Power vs Output Voltage
The next step is to verify that the thermal ratings of the
external 5V and 3.3V MOSFETs aren’t being exceeded
during power-up cycles into the designed loads or into a
short circuit.
The amount of heating in the 5V and 3.3V MOSFETs during
a normal power cycle depends on the LTC4244’s GATE pin
current (refer to Gate Current vs Temperature plot in the
Typical Performance Characteristics section). The magni-
tude of the off-on power pulse that results in maximum
heating of the MOSFETs is given by Equation 10 as:
(
P
V
I
I
OUT
INRUSHMIN
LOAD VOUT
n
(
OFF-ON
=
+
)
n
(
)
)
2
(16)
where
I
C
1
C MAX
(
I
INRUSHMIN
LOAD
GATE MIN
(
)
(
)
)
=
(17)
The duration of the power-pulse is given by Equation 11
as:
t
C
V
I
INRUSH
LOAD
OUT
INRUSHMIN
<
(
)
n
(18)
Solving these equations for the 5V and 3.3V supplies
yields:
Table 6
P
OFF-ON
12.8W
11.8W
t
INRUSH(MAX)
90ms
60ms
5V MOSFET
3.3V MOSFET
Under these conditions, the IRF7457 datasheet’s Thermal
Response vs Pulse Duration curve indicates that the
junction-to-ambient temperature will increase by 60
°
C for
the 5V MOSFET and 46
°
C for the 3.3V MOSFET.
The duration and magnitude of the power pulse that
results during a short-circuit condition on either the 5V or
3.3V outputs are a function of the TIMER capacitor and the
LTC4244’s foldback current limit. Figure 16 shows the
worst-case power dissipated in the 5V and 3.3V external
FETs vs V
5VOUT
and V
3.3VOUT
, respectively. In the case of
the 3.3V external MOSFET, the maximum dissipated power
is 24 Watts (V
3.3VOUT
= 0.9V). For the 5V external MOSFET,
the maximum dissipated power is 22 Watts (V
5VOUT
=
1.75V). The maximum duration of the short-circuit power-
pulse is given by Equation 19 as:
t
C
V
V
I
12
t
nF
nF
16
V
V
A
t
ms
PULSE
TIMER MAX
TIMER MIN
TIMER MIN
–1 3
PULSE
PULSE
<
<
+
(
) (
μ
)
<
(
)
(
)
(
)
–
.
.
12
82
8 2
60 3
(19)
APPLICATIOU
W
U
U
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4244CGN-1#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(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)
LTC4244CGN-1#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(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)
LTC4244CGN-1#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:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件
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(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#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(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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