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参数资料
型号： LTC4266CGW#TRPBF
厂商： LINEAR TECHNOLOGY CORP
元件分类： 电源管理
英文描述： POWER SUPPLY MANAGEMENT CKT, PDSO36
封装： 0.300 INCH, LEAD FREE, PLASTIC, SSOP-36
文件页数： 20/30页
文件大小： 414K
代理商： LTC4266CGW#TRPBF
LTC4266
4266fa
U1
LTC4266
PORTS A THROUGH D
SENSE1
SENSE2
SENSE3
SENSE4
VEE
VIA
4266 F20
BY KEEPING THESE COPPER FILLS SEPARATE ON
THE SURFACE, MUTUAL RESISTANCE BETWEEN
PORTS A-D AND E-H IS ELIMINATED
THIS TRACE PROVIDES VEE TO U1
BUT ALSO ACTS AS A KELVIN
SENSE LINE FOR PORTS A-D
VEE COPPER FILL ON SURFACE LAYER
VEE PLANE ON INNER LAYER
U2
LTC4266
PORTS E THROUGH H
SENSE1
SENSE2
SENSE3
SENSE4
VEE
RSENSE
RETURN TO
VEE POWER SUPPLY
Figure20.LayoutStrategytoReduceMutualResistance
ApplicAtions inForMAtion
Figure21.GoodPCBLayoutExample
4266 F21
PORT A RSENSE
PORT B RSENSE
FOUR LARGE VIAS
TO VEE PLANE
PIN 1
U1
THE PADDLE IS
CONNECTED TO
VEE PINS
KELVIN SENSE TRACE CONNECTS U1
TO VEE THROUGH THE VIAS ON THE RIGHT
EDGE OF VEE PLANE (ON SOME INNER LAYER)
VIAS TO SOURCE PIN OF
THE PORT D MOSFET
LOCATED ON THE OPPOSITE
SIDE OF THE BOARD
HOLE IN VEE PLANE
PORT C RSENSE
PORT D RSENSE
connectstotheVEEplanewithavia.CurrentsfromtheU1
sub-circuitareeffectivelyisolatedfromtheU2sub-circuit,
reducingthelayoutproblemdownto4-portchunks;this
arrangementcanbeexpandedforanynumberofports.
Figure21showsanexampleofgood4-portlayout.Each
0.25Ωsenseresistorconsistsoffour1Ωresistorsinparal-
lel.Thefourgroupsofresistorsarearrangedtominimize
theoverlapintheircurrentflows,whichminimizesmutual
resistance.Thehorizontalslitscutinthecopperhelpto
keepthecurrentsseparate.Widecopperpathsconnect
eachgroupofresistorstotheviasatthecenter,sothe
resistanceisverylow.
Properconnectionofthesenselineisalsoimportant.In
Figure21,U1isnotconnecteddirectlytotheVEEplane
but is connected instead to a Kelvin sense trace that
leadstothesenseresistorarray.Similarly,theviaatthe
centerofthesenseresistorarrayhasamatchinghole
intheVEEplane.Thisarrangementpreventsthemutual
resistance of the four large vias from influencing the
currentmeasurements.
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相关代理商/技术参数
参数描述
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LTC4266CIUHF#TRPBF 功能描述:IC CONTROLLER PSE QUAD 38-QFN RoHS:是 类别:集成电路 (IC) >> 接口 - 控制器 系列:- 标准包装:2,450 系列:- 控制器类型:SPI 总线至 I²C 总线桥接 接口:I²C，串行，SPI 电源电压:2.4 V ~ 3.6 V 电流 - 电源:11mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-HVQFN（4x4） 包装:托盘 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名称:935286452157SC18IS600IBSSC18IS600IBS-ND
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LTC4266CUHF#TRPBF 制造商:Linear Technology 功能描述:POE Controller 25.5W 38-Pin QFN EP
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