VPORTN BOLD LINE INDICATES HIGH CURRENT PATH P<" />
參數(shù)資料
型號： LTC4267CGN#TRPBF
廠商： Linear Technology
文件頁數(shù)： 32/32頁
文件大?。?/td> 0K
描述： IC POE 802.3AF INTERFACE 16SSOP
標(biāo)準(zhǔn)包裝： 2,500
控制器類型： 以太網(wǎng)供電控制器（POE）
接口： IEEE 802.3af
電流 - 電源： 3mA
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SSOP
包裝： 帶卷 (TR)
相關(guān)產(chǎn)品： 732-2437-6-ND - TRANS FLYBACK POE 40UH SMD
732-2436-6-ND - TRANS FLYBACK POE 35UH SMD
732-2435-6-ND - TRANS FLYBACK POE 127UH SMD
732-2434-6-ND - TRANS FLYBACK POE 127UH SMD
732-2433-6-ND - TRANS FLYBACK POE 127UH SMD
732-2432-6-ND - TRANS FLYBACK POE 127UH SMD
732-2431-6-ND - TRANS FLYBACK POE 127UH SMD
732-2430-6-ND - TRANS FLYBACK POE 127UH SMD
732-2437-1-ND - TRANS FLYBACK POE 40UH SMD
732-2436-1-ND - TRANS FLYBACK POE 35UH SMD
更多...
LTC4267
9
4267fc
BLOCK DIAGRAM
4267 BD
VPORTN
BOLD LINE INDICATES HIGH CURRENT PATH
POUT
–
+
PGND
RCLASS
PWRGD
CONTROL
CIRCUITS
INPUT
CURRENT
LIMIT
POWER GOOD
CLASSIFICATION
CURRENT LOAD
1.237V
EN
375mA
140mA
9k
16k
–
+
EN
25k
SIGNATURE
RESISTOR
VPORTP
SIGDISA
–
+
–
+
SLOPE
COMP
CURRENT
RAMP
PVCC
GATE
DRIVER
NGATE
SENSE
200kHz
OSCILLATOR
UNDERVOLTAGE
LOCKOUT
Q
R
CURRENT
COMPARATOR
SHUTDOWN
COMPARATOR
SHUTDOWN
S
20mV
ITH/RUN
ERROR
AMPLIFIER
VFB
SOFT-
START
CLAMP
VCC
SHUNT
REGULATOR
SWITCHING
LOGIC AND
BLANKING
CIRCUIT
0.28V
PVCC <
VTURNON
0.3A
PVCC
–
+
1.2V
800mV
REFERENCE
OVERVIEW
The LTC4267 is partitioned into two major blocks: a
Powered Device (PD) interface controller and a current
mode yback switching regulator. The Powered Device
(PD) interface is intended for use as the front end of a
PD adhering to the IEEE 802.3af standard, and includes
a trimmed 25kΩ signature resistor, classication current
source, and an input current limit circuit. With these
functions integrated into the LTC4267, the signature and
power interface for a PD can be built that meets all the
requirements of the IEEE 802.3af specication with a
minimum of external components.
The switching regulator portion of the LTC4267 is a con-
stant frequency current mode controller that is optimized
for Power over Ethernet applications. The regulator is
designed to drive a 6V N-channel MOSFET and features
soft-start and programmable slope compensation. The
integrated error amplier and precision reference give the
PD designer the option of using a nonisolated topology
without the need for an external amplier or reference. The
LTC4267 has been specically designed to interface with
both IEEE compliant Power Sourcing Equipment (PSE)
and legacy PSEs which do not meet the inrush current
requirement of the IEEE 802.3af specication. By setting
the initial inrush current limit to a low level, a PD using
the LTC4267 minimizes the current drawn from the PSE
during start-up. After powering up, the LTC4267 switches
to the high level current limit, thereby allowing the PD to
consume up to 12.95W if an IEEE 802.3af PSE is present.
This low level current limit also allows the LTC4267 to
charge arbitrarily large load capacitors without exceeding
the inrush limits of the IEEE 802.3af specication. This
dual level current limit provides the system designer with
exibility to design PDs which are compatible with legacy
PSEs while also being able to take advantage of the higher
power available in an IEEE 802.3af system.
Using an LTC4267 for the power and signature interface
functions of a PD provides several advantages. The
LTC4267 current limit circuit includes an onboard 100V,
400mA power MOSFET. This low leakage MOSFET is
APPLICATIO S I FOR ATIO
WU
UU
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4267IDHC 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH -57V 16-Pin DFN EP
LTC4267IDHC#PBF 功能描述:IC POE 802.3AF INTERFACE 16-DFN RoHS:是 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類型:SPI 總線至 I²C 總線橋接 接口:I²C，串行，SPI 電源電壓:2.4 V ~ 3.6 V 電流 - 電源:11mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱:935286452157SC18IS600IBSSC18IS600IBS-ND
LTC4267IDHC#TRPBF 功能描述:IC POE 802.3AF INTERFACE 16-DFN RoHS:是 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類型:SPI 總線至 I²C 總線橋接 接口:I²C，串行，SPI 電源電壓:2.4 V ~ 3.6 V 電流 - 電源:11mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱:935286452157SC18IS600IBSSC18IS600IBS-ND
LTC4267IDHC-1#PBF 制造商:Linear Technology 功能描述:Bulk
LTC4267IDHC-3#PBF 功能描述:IC POE 802.3AF W/REG 16-DFN RoHS:是 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類型:SPI 總線至 I²C 總線橋接 接口:I²C，串行，SPI 電源電壓:2.4 V ~ 3.6 V 電流 - 電源:11mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱:935286452157SC18IS600IBSSC18IS600IBS-ND
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