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Document Number: MC34670
Rev. 3.0, 12/2006
Freescale Semiconductor 
Advance Information
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
?Freescale Semiconductor, Inc., 2006. All rights reserved.
IEEE 802.3af PD With Current
Mode Switching Regulator
The 34670 combines a Power Interface Port for IEEE 802.3af
Powered Devices (PD) and a high performance current mode
switching regulator. It allows a designer to build PDs with a minimum
of external components by means of integrating the required IEEE
802.3af functions and all functions necessary to build a high
efficiency DC/DC converter.
On the PD side the 34670 fully supports the IEEE802.3af standard
and provides complete signature and power classification functions.
It controls inrush current limiting and incorporates adjustable
undervoltage lockout. The switching regulator provides excellent line
and load regulation. It drives an external Power MOSFET with sense
resistor.
Features
" Integrated IEEE 802.3af Compliant Interface
" Signature Detection and Classification Functionality
" Integrated Isolation Switch
" Programmable Inrush Current Limiting Control
" Adjustable Undervoltage Lockout
" Input Voltage Range up to 80 V
" Current Mode Control
" Adjustable Oscillator
" Leading Edge Blanking
" Internal Slope Compensation Circuitry
" Input Overvoltage Protection
" 50% Duty Cycle Limitation
" Pb-Free Packaging Designated by Suffix Code EG
 Figure 1. 34670 Simplified Application Diagram
POWER OVER ETHERNET
EG SUFFIX (PB-FREE)
98ASB42343B
20-PIN SOICW
34670
ORDERING INFORMATION
Device 
Temperature
Range (T
A
)
Package
MCZ34670EG/R2
-40癈 to 85癈
20 SOICW
PHY
PHY
PSE HUB OR SWITCH
TX
RX
HOST
PSE POWER
CONTROLLER
48 V POWER
SUPPLY
-48V
GND
CAT 5
SWITCH
RJ-45
PROCESSOR
ETHERNET APPLIANCE (PD)
RX
TX
HOST
PD POWER
CONTROLLER
DC/DC
-48V
CONTROLLER
CABLE
ISOLATION SWITCH
34670
 
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相关代理商/技术参数
MCZ34670EG/R2 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:IEEE 802.3af PD With Current Mode Switching Regulator
MCZ34670EGR2 功能描述:热插拔功率分布 POWER OVER ETHERNET RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MCZ34701EW 功能描述:开关变换器、稳压器与控制器 1.5A Sw-Mode Power Supply w/Linear Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel
MCZ34701EWR2 功能描述:开关变换器、稳压器与控制器 1.5A Sw-Mode Power Supply w/Linear Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel
MCZ34702EW 功能描述:低压差稳压器 - LDO QUICCSUPPLY 2 RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
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