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LTC4257-1

Linear Technology
Part Number LTC4257-1
Manufacturer Linear Technology
Description Power over Ethernet Interface Controller
Published Mar 27, 2005
Detailed Description U U LTC4257-1 IEEE 802.3af PD Power over Ethernet Interface Controller with Dual Current Limit FEATURES ■ Complete Pow...
Datasheet PDF File LTC4257-1 PDF File

LTC4257-1
LTC4257-1

Overview
U U LTC4257-1 IEEE 802.
3af PD Power over Ethernet Interface Controller with Dual Current Limit FEATURES ■ 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 U APPLICATIO S ■ IP Phone Power Management ■ Wireless Access Points ■ Telecom Power Control DESCRIPTIO The LTC®4257-1 provides complete signature and power interface functions for a device operating in an IEEE 802.
3...


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