參數(shù)資料
型號(hào): LTC4257CS8
廠商: Linear Technology
文件頁(yè)數(shù): 2/20頁(yè)
文件大?。?/td> 263K
描述: IC CTRLR INTFACE PWR/ETHER 8SOIC
標(biāo)準(zhǔn)包裝: 100
類型: 以太網(wǎng)供電開關(guān)(PoE)
應(yīng)用: IP 電話,LAN 網(wǎng)絡(luò)供電,網(wǎng)絡(luò)路由器和交換機(jī)
內(nèi)部開關(guān):
電流限制: 350mA
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 管件
產(chǎn)品目錄頁(yè)面: 1338 (CN2011-ZH PDF)
LTC4257
2
4257fb
TOP VIEW
DD PACKAGE
8-LEAD (3mm ?3mm) PLASTIC DFN
5
6
7
8
4
3
2
1
NC
R
CLASS
NC
V
IN
GND
NC
PWRGD
V
OUT
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX    UNITS
V
IN
Supply Voltage
Voltage with Respect to GND Pin (Notes 4, 5, 6)
Maximum Operating Voltage
?/DIV>
57
V
Signature Range
?SPAN class="pst LTC4257CS8_2356185_6">    1.5
9.5
V
Classification Range
?SPAN class="pst LTC4257CS8_2356185_6">   12.5
21
V
UVLO Turn-On Voltage
?SPAN class="pst LTC4257CS8_2356185_6">   37.7    39.2
40.2
V
UVLO Turn-Off Voltage
?SPAN class="pst LTC4257CS8_2356185_6">   29.3    30.5
31.5
V
I
IN_ON
IC Supply Current when ON
V
IN
 = 48V, Pins 5, 6 Floating
?/DIV>
3
mA
I
IN_CLASS
IC Supply Current During Classification  V
IN
 = 17.5V, Pin 2 Floating, V
OUT
 Tied to GND
?SPAN class="pst LTC4257CS8_2356185_6">    0.35
0.50
0.65
mA
(Note 7)
I
CLASS
Current Accuracy During Classification   10mA < I
CLASS
 < 40mA, 12.5V d V
IN
 d 21V,
?/DIV>
?.5
%
(Notes 8, 9)
(Notes 1, 2)
V
IN
 Voltage ............................................. 0.3V to 100V
V
OUT
, PWRGD Voltage............. V
IN
 + 100V to V
IN
  0.3V
R
CLASS
 Voltage ............................ V
IN
 + 7V to V
IN
  0.3V
PWRGD Current .................................................. 10mA
R
CLASS
 Current .................................................. 100mA
The ?/SPAN> denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
 = 25?/SPAN>C. (Note 3)
ABSOLUTE AXI U RATI GS
W
W
U
ELECTRICAL CHARACTERISTICS
Operating Ambient Temperature Range
LTC4257C ...............................................0癈 to 70癈
LTC4257I.............................................40癈 to 85癈
Storage Temperature Range
S8 Package....................................... 65癈 to 150癈
DD Package ...................................... 65癈 to 125癈
Lead Temperature (Soldering, 10 sec)..................300癈
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grades are identified by a label on the shipping container.
ORDER PART NUMBER
S8 PART MARKING
T
JMAX
 = 150癈, ?/DIV>
JA
 = 150癈/W
4257
4257I
LTC4257CS8
LTC4257IS8
1
2
3
4
8
7
6
5
TOP VIEW
GND
NC
PWRGD
V
OUT
NC
R
CLASS
NC
V
IN
S8 PACKAGE
8-LEAD PLASTIC SO
PACKAGE/ORDER I FOR ATIO
U
W
ORDER PART NUMBER
DD PART MARKING*
T
JMAX
 = 125癈, ?/DIV>
JA
 = 43癈/W
EXPOSED PAD TO BE SOLDERED TO
ELECTRICALLY ISOLATED PCB HEATSINK
LACT
LTC4257CDD
LTC4257IDD
Order Options  Tape and Reel: Add #TR    Lead Free: Add #PBF
Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/
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參數(shù)描述
LTC4257CS8-#1TRPBF 制造商:LINEAR_TECH 功能描述:
LTC4257CS8#PBF 功能描述:IC CTRLR INTFACE PWR/ETHER 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型: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)部開關(guān):無 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
LTC4257CS8#TR 功能描述:IC CTRLR INTFACE PWR/ETHER 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型: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)部開關(guān):無 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
LTC4257CS8#TRPBF 功能描述:IC CTRLR INTFACE PWR/ETHER 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型: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)部開關(guān):無 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
LTC4257CS81 制造商:Linear Technology 功能描述: