LTC4257 Series

IEEE 802.3af PD Power over Ethernet Interface Controller

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

IEEE 802.3af PD Power over Ethernet Interface Controller

Part	Supplied Contents	Function	Type	Utilized IC / Part	Contents	Voltage - Supply	Current - Supply	Package / Case	Power - Max [Max]	Supplier Device Package	Operating Temperature [Max]	Operating Temperature [Min]	Standards	Number of Channels [custom]	Mounting Type	Package / Case	Package / Case
Analog Devices Inc./Maxim Integrated DC959A	Board(s)	Power over Ethernet (PoE)	Power Management	LTC3825 LTC4257-1	Board(s)
Analog Devices Inc./Maxim Integrated LTC4257IDD#TRPBF			Controller (PD)			57 V	3 mA	8-WFDFN Exposed Pad	12.95 W	8-DFN (3x3)	85 °C	-40 C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257IS8#PBF			Controller (PD)			57 V	3 mA	8-SOIC	12.95 W	8-SO	85 °C	-40 C	802.3af (PoE)	1	Surface Mount	0.154 in	3.9 mm
Analog Devices Inc./Maxim Integrated LTC4257CS8#PBF			Controller (PD)			57 V	3 mA	8-SOIC	12.95 W	8-SO	70 °C	0 °C	802.3af (PoE)	1	Surface Mount	0.154 in	3.9 mm
Analog Devices Inc./Maxim Integrated LTC4257IDD-1#PBF			Controller (PD)			57 V	3 mA	8-WFDFN Exposed Pad	12.95 W	8-DFN (3x3)	85 °C	-40 C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257CDD#PBF			Controller (PD)			57 V	3 mA	8-WFDFN Exposed Pad	12.95 W	8-DFN (3x3)	70 °C	0 °C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257IDD#PBF			Controller (PD)			57 V	3 mA	8-WFDFN Exposed Pad	12.95 W	8-DFN (3x3)	85 °C	-40 C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257CDD#TRPBF			Controller (PD)			57 V	3 mA	8-WFDFN Exposed Pad	12.95 W	8-DFN (3x3)	70 °C	0 °C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257IS8-1#PBF			Controller (PD)			57 V	3 mA	8-SOIC	12.95 W	8-SO	85 °C	-40 C	802.3af (PoE)	1	Surface Mount	0.154 in	3.9 mm
Analog Devices Inc./Maxim Integrated LTC4257CS8#TRPBF			Controller (PD)			57 V	3 mA	8-SOIC	12.95 W	8-SO	70 °C	0 °C	802.3af (PoE)	1	Surface Mount	0.154 in	3.9 mm

Catalog

IEEE 802.3af PD Power over Ethernet Interface Controller

Description

The LTC4257 provides complete signature and power interface functions for a device operating in an IEEE 802.3af Power over Ethernet (PoE) system. The LTC4257 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 LTC4257 provides the system designer with reduced cost while also saving board space.The LTC4257 can interface directly with a variety of ADI's DC/DC converter products to provide a cost effective power solution for IP phones, wireless access points and other PDs. Analog Devices also provides solutions for Power Sourcing Equipment (PSE) applications with quad network power controllers.The LTC4257 is available in the 8-pin SO and low profile (3mm × 3mm) DFN packages.ApplicationsIP Phone Power ManagementWireless Access PointsTelecom Power Control