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參數資料
| 型號： | LTC4268IDKD-1#PBF |
| 廠商： | Linear Technology |
| 文件頁數： | 13/46頁 |
| 文件大小： | 419K |
| 描述： | IC PD HIGH POWER W/CNTRL 32-DFN |
| 產品培訓模塊： | Power over Ethernet |
| 標準包裝： | 52 |
| 類型： | 以太網供電開關（PoE） |
| 應用： | 遠程外設（工業控制，相機，數據訪問） |
| 內部開關： | 是 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-WFDFN 裸露焊盤 |
| 供應商設備封裝： | 32-DFN（7x4）裸露焊盤 |
| 包裝： | 管件 |
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LTC4268-1
13
OVERVIEW
Power over Ethernet (PoE) continues to gain popularity
as an increasing number of products are taking advantage
of having DC power and high speed data available from a
single RJ45 connector. As PoE is becoming established in
the marketplace, Powered Device (PD) equipment vendors
are running into the 12.95W power limit established by the
IEEE 802.3af standard. To solve this problem and expand
the application of PoE, the LTC4268-1 breaks the power
barrier by allowing custom PoE applications to deliver up to
35W for power hungry PoE applications such as dual band
access points, RFID readers and PTZ security cameras.
The LTC4268-1 is designed to be a complete solution for
PD applications with power requirements up to 35W. The
LTC4268-1 interfaces with custom Power Sourcing Equip-
ment (PSE) using a high efficiency flyback topology for
maximum power delivery without the need for opto-isolator
feedback. Off-the-shelf high power PSEs are available today
from a variety of vendors for use with the LTC4268-1 to
allow quick implementation of a custom system.
applicaTions inForMaTion
OPERATION
Note: Please refer to the simplified application circuit
(Figure 1) for voltage naming conventions used in this
data sheet.
The LTC4268-1 high power PD interface controller and
switching regulator has several modes of operation depend-
ing on the applied V
PORT
voltage as shown in Figure 2 and
summarized in Table 1. These various modes satisfy the
requirements defined in the IEEE 802.3af specification. The
input voltage is applied to the V
PORTN
pin with reference
to the V
PORTP
pin and is always negative.
SERIES DIODES
The IEEE 802.3af-defined operating modes for a PD refer-
ence the input voltage at the RJ45 connector on the PD.
In this data sheet port voltage is normally referenced to
the pins of the LTC4268-1. Note that the voltage ranges
specified in the LTC4268-1 Electrical Specifications are
referenced with respect to the IC pins.
"
"
16
14
15
1
3
2
RX
6
RX
+
3
TX
2
TX
+
J45
PD FRONT END
SWITCHING REGULATOR
ISOLATED OUTPUT
T1
1
7
8
5
4
11
9
10
6
8
7
TO PHY
V
PORTP
LTC4268-1
V
PORTN
V
NEG
GND
V
CC
PG
SPARE
SPARE
+
V
PORT
V
IN
V
OUT
+
~
~
+
~
~
+
+
Figure 1. Simplified Application Circuit With Voltage Naming Conventions
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC4268IDKD-1-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Power PD with Synchronous NoOpto Flyback Controller |
| LTC4268IDKD-1-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Power PD with Synchronous NoOpto Flyback Controller |
| LTC4269-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:IEEE 802.3at PD with Synchronous No-Opto Flyback Controller |
| LTC4269-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support |
| LTC4269CDKD-1#PBF | 功能描述:IC PD/OPTO FLYBACK CTRLR 32-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標準包裝:50 系列:- 類型:熱交換控制器 應用:-48V 遠程電力系統，AdvancedTCA ? 系統，高可用性 內部開關:無 電流限制:可調 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
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