LTC4259ACGW#PBF

Overview

The LTC4259ACGW#PBF is a Power Sourcing Equipment (PSE) controller designed for IEEE 802.3af compliant Power over Ethernet applications. It integrates four independent channels, each capable of delivering up to 425 mA of current limit. The device operates with an input supply voltage range of 48V to 57V and features a control supply voltage range of 3V to 4V. It supports surface mount installation in a 36-SSOP package and functions within an operating temperature range of 0°C to +70°C.

Feature Summary

• Integrates four independent PoE channels compliant with IEEE 802.3af standards
• Includes integrated AC disconnect functionality for port management
• Provides precise current limiting capabilities per channel
• Supports standard PSE power sourcing equipment architectures

Applications

• IEEE 802.3af compliant Power Sourcing Equipment designs
• Multi-port PoE injectors and midspan devices
• LAN infrastructure requiring integrated power switching
• Network switches with PoE uplink capabilities

Procurement Notes

Verify the specific suffix designation when ordering, as variants such as #TRPBF indicate tape-and-reel packaging while #PBF denotes tube packaging. Confirm availability status directly with authorized distributors, as stock levels for this component may be limited or subject to allocation. Ensure the selected package matches the PCB footprint requirements for the 36-SSOP form factor.

Selection Notes

Select this component for designs requiring four-channel PoE compliance without external discrete switching elements. Compare against the LTC4258 series if internal disconnect features are not required, noting that the LTC4259 includes AC disconnect capabilities. Ensure the system design accommodates the 36-SSOP thermal characteristics and the specified 3V to 4V control supply range.

Part Context

This part belongs to the Analog Devices LTC425x family of PoE controllers. It serves as a specialized solution for managing power delivery over Ethernet cables. The device simplifies board layout by integrating high-voltage switches and control logic into a single compact package, reducing the bill of materials for network power applications.

Replacement Considerations

The LTC4258CGW#PBF is a related variant within the same family. Note that the LTC4259 includes AC disconnect features which may differ from other models in the series. Verify pin compatibility and functional differences before substituting.