參數(shù)資料
型號(hào)： LTC4274CUHF#PBF
廠商： Linear Technology
文件頁數(shù)： 1/28頁
文件大?。?/td> 702K
描述： IC CONTROLLER POE 38-QFN
標(biāo)準(zhǔn)包裝： 52
類型： 以太網(wǎng)供電 PSE 控制器（PoE）
應(yīng)用： 供電設(shè)備（PSE）
內(nèi)部開關(guān)： 無
電流限制： 可調(diào)
電源電壓： 3 V ~ 4.3 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 38-QFN
供應(yīng)商設(shè)備封裝： 38-QFN（5x7）裸露焊盤
包裝： 管件
LTC4274
1
4274fd
n
  PSE Switches/Routers
n
  PSE Midspans
 APPLICATIONS
 FEATURES
 DESCRIPTION
Single PoE
+
 PSE Controller
The LTC
?/DIV>
4274 is a single power sourcing equipment con-
troller designed for use in IEEE 802.3 Type 1 and Type 2
(high power) compliant Power over Ethernet systems.
External power MOSFETs enhance system reliability and
minimize channel resistance, cutting power dissipation and
eliminating the need for heatsinks even at Type 2 power
levels. External power components also allow use at very
high power levels while remaining otherwise compatible
with the IEEE standard. 80V-rated port pins provide robust
protection against external faults.
The LTC4274 includes advanced power management
features, including current and voltage readback and pro-
grammable I
CUT
 and I
LIM
 thresholds. Available C libraries
simplify software development; an optional AUTO pin mode
provides fully IEEE-compliant standalone operation with
no software required. Proprietary 4-point PD detection
circuitry minimizes false PD detection while supporting
legacy phone operation. Midspan operation is supported
with built-in 2-event classification and backoff timing.
Host communication is via a 1MHz I
2
C serial interface.
The LTC4274 is available in a 5mm ?7mm QFN package
that significantly reduces board space compared with
competing solutions.
n
  Compliant with IEEE 802.3at Type 1 and 2
n
  0.34?Total Channel Resistance
   130mW/Port at 600mA
n
  Advanced Power Management
 
8-Bit Programmable Current Limit (I
LIM
)
 
7-Bit Programmable Overload Currents (I
CUT
)
 
Fast Shutdown
   14.5-Bit Port Current/Voltage Monitoring
   2-Event Classification
n
  Very High Reliability 4-Point PD Detection:
   2-Point Forced Voltage
   2-Point Forced Current
n
  High Capacitance Legacy Device Detection
n
  LTC4259A-1 and LTC4266 SW Compatible
n
  1MHz I
2
C Compatible Serial Control Interface
n
  Midspan Backoff Timer
n
  Supports Proprietary Power Levels Above 25W
n
  Available in 38-Pin 5mm ?7mm QFN Package
 TYPICAL APPLICATION
Complete Ethernet High Power Source
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and LTPoE
++
 are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
4274 TA01
SCL
SDAIN
SDAOUT
AD0
AD1
AD2
AD3
AGND
V
EE
SENSE
54V
1糉
100V
SMAJ58A
GATE  OUT
PORT
0.22糉
100V
S1B
S1B
54V
DGND
V
DD
INT
SHDN
AUTO
MSD
RESET
MID
0.1糉
3.3V
LTC4274
相關(guān)PDF資料
PDF描述
LTC4280CUFD#PBF IC CONTROLLER HOT SWAP QFN-24
LTC4300-1IMS8#TRPBF IC HOTSWAP 2WIRE BUS BUFFR 8MSOP
LTC4300A-2IMS8#TRPBF IC BUFFER BUS 2WR HOTSWAP 8-MSOP
LTC4301IDD IC BUFFER BUS HOTSWAP 2WR 8DFN
LTC4301LIDD#TRPBF IC BUFFER BUS HOTSWAP 2WR 8DFN
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4274IUHF#PBF 制造商:Linear Technology 功能描述:POE Controller 25.5W 38-Pin QFN EP 制造商:Linear Technology 功能描述:Bulk 制造商:Linear Technology 功能描述:IC POE IEEE 802.3AT 38-QFN 制造商:Linear Technology 功能描述:IC POE CNTRL 38QFN 制造商:Linear Technology 功能描述:IC, POE, CNTRL, 38QFN 制造商:Linear Technology 功能描述:IC, POE CONTROLLER, 3.6V, QFN-38; Input Voltage:3.6V; Supply Current:1.1mA; Digital IC Case Style:QFN; No. of Pins:38; Frequency:1MHz; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes
LTC4274IUHF#PBF 制造商:Linear Technology 功能描述:IC POE CONTROLLER 3.6V QFN-38
LTC4274IUHF#TRPBF 制造商:Linear Technology 功能描述:POE Controller 25.5W 38-Pin QFN EP
LTC42766C 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad PoE/PoE/LTPoE PSE Controller
LTC4278 制造商:LINER 制造商全稱:Linear Technology 功能描述:IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*