LTC4257IDD-1#PBF

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Analog Devices Inc./Maxim Integrated

IEEE 802.3AF PD POWER OVER ETHERNET INTERFACE CONTROLLER WITH DUAL CURRENT LIMIT

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LTC4257IDD-1#PBF

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Analog Devices Inc./Maxim Integrated

IEEE 802.3AF PD POWER OVER ETHERNET INTERFACE CONTROLLER WITH DUAL CURRENT LIMIT

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC4257 Series

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

Technical Specifications

Parameters and characteristics for this part

Specification	LTC4257IDD-1#PBF

Auxiliary Sense	No
Current - Supply	3 mA
Internal Switch(s)	Yes
Mounting Type	Surface Mount
Number of Channels	1
Operating Temperature (Max)	85 °C
Operating Temperature (Min)	-40 °C
Package / Case	8-WFDFN Exposed Pad
Package Length	3 mm
Package Name	8-DFN
Package Width	3 mm
Power - Max	12.95 W
Standards	802.3af (PoE)
Type	Controller (PD)
Voltage - Supply	57 V

LTC4257 Series

IEEE 802.3af PD Power over Ethernet Interface Controller

Part	Supplied Contents	Function	Type	Utilized IC / Part	Embedded	Contents	Voltage - Supply	Current - Supply	Auxiliary Sense	Package / Case	Internal Switch(s)	Power - Max	Package Width	Package Name	Package Length	Operating Temperature (Min)	Operating Temperature (Max)	Standards	Number of Channels	Mounting Type
Analog Devices Inc./Maxim Integrated DC959A	Board(s)	Power Over Ethernet (POE)	Power Management	LTC3825 LTC4257-1	No	Board
Analog Devices Inc./Maxim Integrated LTC4257IDD#TRPBF			Controller (PD)				57 V	3 mA	No	8-WFDFN Exposed Pad	Yes	12.95 W	3 mm	8-DFN	3 mm	-40 °C	85 °C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257IS8#PBF			Controller (PD)				57 V	3 mA	No		Yes	12.95 W	3.9 mm	8-SO 8-SOIC	0.154 in	-40 °C	85 °C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257CS8#PBF			Controller (PD)				57 V	3 mA	No		Yes	12.95 W	3.9 mm	8-SO 8-SOIC	0.154 in	0 °C	70 °C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257IDD-1#PBF			Controller (PD)				57 V	3 mA	No	8-WFDFN Exposed Pad	Yes	12.95 W	3 mm	8-DFN	3 mm	-40 °C	85 °C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257CDD#PBF			Controller (PD)				57 V	3 mA	No	8-WFDFN Exposed Pad	Yes	12.95 W	3 mm	8-DFN	3 mm	0 °C	70 °C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257IDD#PBF			Controller (PD)				57 V	3 mA	No	8-WFDFN Exposed Pad	Yes	12.95 W	3 mm	8-DFN	3 mm	-40 °C	85 °C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257CDD#TRPBF			Controller (PD)				57 V	3 mA	No	8-WFDFN Exposed Pad	Yes	12.95 W	3 mm	8-DFN	3 mm	0 °C	70 °C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257IS8-1#PBF			Controller (PD)				57 V	3 mA	No		Yes	12.95 W	3.9 mm	8-SO 8-SOIC	0.154 in	-40 °C	85 °C	802.3af (PoE)	1	Surface Mount
Analog Devices Inc./Maxim Integrated LTC4257CS8#TRPBF			Controller (PD)				57 V	3 mA	No		Yes	12.95 W	3.9 mm	8-SO 8-SOIC	0.154 in	0 °C	70 °C	802.3af (PoE)	1	Surface Mount

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LTC4257IDD-1#PBF | Datasheet

PoE Consortium Interoperability Report

R413 Reliability Data

PoE Consortium Clause # 33 Parametric Report