LT LTC4257CDD#TRPBF

控制器（PD）12.95 W802.3af（PoE）

Overview

The LTC4257CDD provides complete signature and power interface functions for a device operating in an IEEE 802.3af Power over Ethernet (PoE) system. The LTC4257CDD simplifies Powered Device (PD) design by incorporating the 25k signature resistor, the classification current source, input current limit with thermal foldback, undervoltage lockout and power good signaling, all in a single 8-pin package. By incorporating a high voltage power MOSFET onboard, the LTC4257CDD provides the system designer with reduced cost while also saving board space.

The LTC4257CDD is available in the 8-pin SO and low profile (3mm × 3mm) DFN packages.

Features

Bulk Package
Tape & Reel (TR) package
8 pin count

Surface Mount Mounting Type

Applications

There are a lot of Linear Technology/Analog Devices
LTC4257CDD#TRPBF Power Over Ethernet (PoE) Controllers applications.

• IEEE 802.3af Compliant PoE Powered Devices
• Non-Compliant, Application Specific Devices
• Higher Power Ethernet Powered Devices
• IP Phone Power Management
• Wireless Access Points
• Security Cameras
• Power over Ethernet
• PoE powered device appliances
• High power (>12.95 W) powered devices
• IEEE 802.3bt (Draft) Compliant Devices