參數(shù)資料
型號(hào)： LTC4270BIUKG#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PQCC52
封裝： 8 X 7 MM, LEAD FREE, PLASTIC, QFN-52
文件頁數(shù)： 19/32頁
文件大?。?/td> 344K
代理商： LTC4270BIUKG#TRPBF
LTC4270/LTC4271
26
42701fa
APPLICATIONS INFORMATION
3.3V
0.1μF
–54V
100Ω
T1
3.3V
1μF
0.1μF
–54V
100Ω
T2
GP0
GP1
MID
RESET
MSD
INT
AUTO
SCL
AD0
AD1
AD2
AD3
AD6
DGND
CAP1
CAP2
DND
DPD
CND
CPD
DNA
SENSE1
GATE1
OUT1
LTC4270
DPA
CNA
CPA
XIO0
XIO1
0.22μF
100V
0.22μF
100V
S1B
–54V
42701 F16
–54V
S1B
PORTn
PORT1
SDAIN
SDAOUT
LTC4271
NO ISOLATION
REQUIRED ON
I2C INTERFACE
VDD33
2nF, 2kV
VEE
SENSEn
GATEn
OUTn
AGND
VSSK
0.25Ω
>47μF
SYSTEM
BULK CAP
+
External MOSFET
Careful selection of the power MOSFET is critical to system
reliability. LTC recommends either Fairchild IRFM120A,
FDT3612, FDMC3612 or Philips PHT6NQ10T for their
proven reliability in Type 1 and Type 2 PSE applications.
SOA curves are not a reliable specification for MOSFET
selection. Contact LTC Applications before using a MOSFET
other than one of these recommended parts.
Sense Resistor
The LTC4270/LTC4271 is designed to use 0.25Ω current
sense resistors to reduce power dissipation. Four com-
monly available 1Ω resistors (sized according to power
dissipation) can be used in parallel in place of a single
Figure 15. LTC4270/LTC4271 Proprietary Isolation
0.25Ω resistor. In order to meet the ICUT and ILIM accuracy
required by the IEEE specification, the sense resistors
should have ±1% tolerance or better, and no more than
±200ppm/°C temperature coefficient. In addition, the sense
resistors must meet strict layout guidelines.
Port Output Cap
Each port requires a 0.22μF cap across its outputs to keep
the LTC4270 stable while in current limit during startup or
overload. Common ceramic capacitors often have signifi-
cant voltage coefficients; this means the capacitance is
reduced as the applied voltage increases. To minimize this
problem, X7R ceramic capacitors rated for at least 100V
are recommended and must be located close to the PSE.
相關(guān)PDF資料
PDF描述
LTC4270BIUKG#PBF SPECIALTY ANALOG CIRCUIT, PQCC52
LTC4270AIUKG#TRPBF SPECIALTY ANALOG CIRCUIT, PQCC52
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LTC4274CIUHF#PBF POWER SUPPLY MANAGEMENT CKT, PQCC38
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4270CIUKG#PBF 制造商:Linear Technology 功能描述:POE Controller 13W 52-Pin QFN EP 制造商:Linear Technology 功能描述:IC POE LTPOE 12-PORT PSE 52-QFN 制造商:Linear Technology 功能描述:PSE CNTRL 12 PORT 13W 1MHZ 制造商:Linear Technology 功能描述:IC PSE CONTROLLER 3.3V QFN-52 制造商:Linear Technology 功能描述:IC, PSE CONTROLLER, 3.3V, QFN-52; Input Voltage:3.3V; Supply Current:10mA; UVLO:25V; Digital IC Case Style:QFN; No. of Pins:52; Frequency:1MHz; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:52-QFN ;RoHS Compliant: Yes
LTC4270CIUKG#PBF 制造商:Linear Technology 功能描述:IC PSE CONTROLLER 3.3V QFN-52 制造商:Linear Technology 功能描述:IC, PSE CONTROLLER, 3.3V, QFN-52
LTC4270CIUKG#TRPBF 制造商:Linear Technology 功能描述:POE Controller 13W 52-Pin QFN EP 制造商:Linear Technology 功能描述:PSE CONTROLLER, 12PORT, 57V, QFN-52; Supply Current:10mA; UVLO:25V; Digital IC Case Style:QFN; No. of Pins:52; Duty Cycle (%):6.3%; Frequency:1MHz; Operating Temperature Min:-40C; Operating Temperature Max:85C ;RoHS Compliant: Yes
LTC4271 制造商:LINER 制造商全稱:Linear Technology 功能描述:Single PoE/PoE/LTPoE PSE Controller
LTC4271IUF#PBF 制造商:Linear Technology 功能描述:POE Controller 90W 24-Pin QFN EP 制造商:Linear Technology 功能描述:Bulk 制造商:Linear Technology 功能描述:IC POE 12-/8-PORT PSE 24-QFN 制造商:Linear Technology 功能描述:IC PSE CONTROLLER 3.3V QFN-24 制造商:Linear Technology 功能描述:IC, PSE CONTROLLER, 3.3V, QFN-24 制造商:Linear Technology 功能描述:IC, PSE CONTROLLER, 3.3V, QFN-24; Input Voltage:3.3V; Supply Current:10mA; UVLO:25V; Digital IC Case Style:QFN; No. of Pins:24; Frequency:1MHz; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:24-QFN ;RoHS Compliant: Yes
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