Datasheet > LTC4257CS8-1

LTC4257CS8-1

更新时间： 2024-09-16 22:22:35

品牌	Logo	应用领域
凌特 - Linear		控制器以太网
页数	文件大小	规格书
20页	268K
描述
Power over Ethernet Interface Controller with Dual Current Limit

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中文翻译

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LTC4257CS8-1 数据手册

LTC4257-1

IEEE 802.3af PD

Power over Ethernet Interface

Controller with Dual Current Limit

FEATURES

DESCRIPTIO

Complete Power Interface Port for IEEE 802^®.3af

Powered Devices (PDs)

The LTC^®4257-1 provides complete signature and power

interface functions for a device operating in an IEEE

802.3afPoweroverEthernet(PoE)system.TheLTC4257-1

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.

■

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

APPLICATIO S

■

IP Phone Power Management

■

Wireless Access Points

The LTC4257-1 can interface directly with a variety of Lin-

earTechnologyDC/DCconverterproductstoprovideacost

effective power solution for IP phones, wireless access

points and other PDs. Linear Technology also provides

networkpowercontrollersforPowerSourcingEquipment

(PSE) applications.

■

Telecom Power Control

The LTC4257-1 is available in the 8-pin SO and low profile

(3mm × 3mm) DFN packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

802 is a registered trademark of Institute of Electrical and Electronics Engineers, Inc.

TYPICAL APPLICATIO

Powered Device (PD)

LTC4257-1

GND

5µF

–

SMAJ58A

MIN

–48V FROM

POWER SOURCING

EQUIPMENT

(PSE)

SWITCHING

POWER SUPPLY

SIGDISA

PWRGD

0.1µF

DF01SA

CLASS

100k

SHDN

RTN

3.3V

CLASS

TO LOGIC

–

OUT

42571 TA01

42571fa

12 3 4 5 6 7...20

中文翻译

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与LTC4257CS8-1相关器件

型号	品牌	获取价格	描述	数据表
LTC4257CS8-1#TR	Linear	获取价格	LTC4257-1 - IEEE 802.3af PD Power over Ethernet Interface Controller with Dual Current Lim
LTC4257CS8-1#TRPBF	Linear	获取价格	LTC4257-1 - IEEE 802.3af PD Power over Ethernet Interface Controller with Dual Current Lim
LTC4257IDD	Linear	获取价格	IEEE 802.3af PD Power over Ethernet Interface Controller
LTC4257IDD#PBF	Linear	获取价格	暂无描述
LTC4257IDD#TR	Linear	获取价格	LTC4257 - IEEE 802.3af PD Power over Ethernet Interface Controller; Package: DFN; Pins: 8;
LTC4257IDD#TRPBF	Linear	获取价格	暂无描述
LTC4257IDD-1	Linear	获取价格	Power over Ethernet Interface Controller with Dual Current Limit
LTC4257IDD-1#PBF	Linear	获取价格	LTC4257-1 - IEEE 802.3af PD Power over Ethernet Interface Controller with Dual Current Lim
LTC4257IDD-1#TR	Linear	获取价格	暂无描述
LTC4257IDD-1#TRPBF	Linear	获取价格	LTC4257-1 - IEEE 802.3af PD Power over Ethernet Interface Controller with Dual Current Lim

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