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参数资料
| 型号： | LTC4267CGN-1#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator; Package: SSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| 中文描述： | 1 A SWITCHING CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16 |
| 文件页数： | 32/32页 |
| 文件大小： | 925K |
| 代理商： | LTC4267CGN-1#PBF |
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LTC4267-1
9
42671f
BLOCK DIAGRAM
OVERVIEW
The LTC4267-1 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 25k signature resistor, classication current
source, and an input current limit circuit. With these
functions integrated into the LTC4267-1, 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 LTC4267-1 is a
constant frequency current mode controller that is opti-
mized 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
LTC4267-1 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 LTC4267-1 minimizes the current drawn from the PSE
during start-up. After powering up, the LTC4267-1 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 LTC4267-1 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 LTC4267-1 for the power and signature inter-
face functions of a PD provides several advantages. The
LTC4267-1 current limit circuit includes an onboard 100V
power MOSFET. This low leakage MOSFET is specied to
APPLICATIO S I FOR ATIO
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相关PDF资料 |
PDF描述 |
|---|---|
| LTC4267CGN-1#TRPBF | Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator; Package: SSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| LTC4267IGN-1#PBF | Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C |
| LTC4267IGN-1#TRPBF | Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C |
| LPO3310-102MLB | Power inductor, 20% tol, SMT, RoHS |
| LPO3310-102MLC | Power inductor, 20% tol, SMT, RoHS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4267CGN-1-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator |
| LTC4267CGN-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator |
| LTC4267CGN-3#PBF | 功能描述:IC POE 802.3AF W/REG 16-SSOP 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 |
| LTC4267CGN-3#TRPBF | 功能描述:IC POE 802.3AF INTERFACE 16SSOP 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 |
| LTC4267CGNPBF | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-Ch -57V SSOP16 |
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