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參數(shù)資料
| 型號(hào)： | LTC4257IS8-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: SO; No of Pins: 8; Temperature Range: -40°C to +85°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SO-8 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 265K |
| 代理商： | LTC4257IS8-1#PBF |
LTC4257-1
1
42571fb
The LTC
4257-1 provides complete signature and power
interface functions for a device operating in an IEEE
802.3af Power over Ethernet (PoE) system. The LTC4257-1
simplifies Powered Device (PD) design by incorporating
the 25k signature resistor, classification current source,
input current limit, undervoltage lockout, thermal over-
load protection, signature disable and power good signal-
ling, all in a single 8-pin package. The LTC4257-1 includes
a precision, dual level current limit circuit. This allows it to
charge large load capacitors and interface with legacy
Power over Ethernet systems while maintaining compat-
ibility with the current IEEE 802.3af specification. By
incorporating a high voltage power MOSFET onboard, the
LTC4257-1 provides the system designer with reduced
cost while also saving board space.
The LTC4257-1 can interface directly with a variety of Lin-
ear Technology DC/DC converter products to provide a cost
effective power solution for IP phones, wireless access
points and other PDs. Linear Technology also provides
network power controllers for Power Sourcing Equipment
(PSE) applications.
The LTC4257-1 is available in the 8-pin SO and low profile
(3mm
× 3mm) DFN packages.
■ IP Phone Power Management
■ Wireless Access Points
■ Telecom Power Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
■ Complete Power Interface Port for IEEE 802
.3af
Powered Devices (PDs)
■ Onboard 100V, 400mA Power MOSFET
■ Precision Dual Level Current Limit
■
Onboard 25k Signature Resistor with Disable
■ Programmable Classification Current (Class 0-4)
■ Undervoltage Lockout
■
Thermal Overload Protection
■ Power Good Signal
■ Available in 8-Pin SO and Low Profile (3mm
× 3mm)
DFN Packages
IEEE 802.3af PD
Power over Ethernet Interface
Controller with Dual Current Limit
GND
RCLASS
SMAJ58A
0.1
F
SIGDISA
PWRGD
LTC4257-1
VIN
SHDN
100k
5
F
MIN
3.3V
TO LOGIC
RTN
SWITCHING
POWER SUPPLY
VIN
VOUT
–48V FROM
POWER SOURCING
EQUIPMENT
(PSE)
42571 TA01
+
–
+
DF01SA
~
+
–
Powered Device (PD)
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
All other trademarks are the property of their respective owners.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC4257IS8-1#TRPBF | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: SO; No of Pins: 8; Temperature Range: -40°C to +85°C |
| LTC4257CDD#PBF | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: DFN; No of Pins: 8; Temperature Range: 0°C to +70°C |
| LTC4257CDD#TRPBF | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: DFN; No of Pins: 8; Temperature Range: 0°C to +70°C |
| LTC4257CS8#PBF | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: SO; No of Pins: 8; Temperature Range: 0°C to +70°C |
| LTC4257CS8#TRPBF | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: SO; No of Pins: 8; Temperature Range: 0°C to +70°C |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4258 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad IEEE 802.3at Power over Ethernet Controller |
| LTC4258_09 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad IEEE 802.3af Power over Ethernet Controller with Integrated Detection |
| LTC4258CGW | 制造商:Linear Technology 功能描述:POWER OVER ETHERNET CONTROLLER |
| LTC4258CGW#PBF | 功能描述:IC POE 802.3AF QUAD 36-SSOP 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 |
| LTC4258CGW#TR | 制造商:Linear Technology 功能描述:POWER OVER ETHERNET CONTROLLER |
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