參數(shù)資料
型號(hào)： PCZ34670EG
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 1.27 PITCH, ROHS COMPLIANT, PLASTIC, MS-013AC, SOIC-20
文件頁(yè)數(shù)： 1/24頁(yè)
文件大小： 986K
代理商： PCZ34670EG
Document Number: MC34670
Rev. 1.0, 7/2006
Freescale Semiconductor
Product Preview
Freescale Semiconductor, Inc., 2006. All rights reserved.
*This document contains certain information on a product under development. Free-
scale reserves the right to change or discontinue this product without notice
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 (TA)
Package
PCZ34670EG/R2
-40°C to 85°C
20 SOICW
3
6
1
2
4
5
8
7
RX
TX
CPORT
RCLASS
M1
RCS
T1
VOUT =5V@2A
SS
VPWR
RCLA
UVLO
ILIM
VIN
VOUT
FB
CS
GATE
VDD
FREQ
RESET
R2
R1
CDD
D1
NP
NS
RV
-VPort
+VPort
CSS
CIN
COMP
RX+
RX-
TX+
TX-
SPARE+
SPARE-
V
Po
rt
34670
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