LTC4258CGW#TRPBF

Overview

The LTC4258CGW#TRPBF is a Power Sourcing Equipment (PSE) controller compliant with IEEE 802.3af standards, designed for PoE applications. It integrates four independent channels within an SSOP-36 package. The device operates on a supply voltage of 3 V to 4 V and draws a typical operating current of 2.5 mA. Each channel supports a current limit of 425 mA. It functions within a temperature range of 0°C to +70°C.

Feature Summary

• Integrates four independent power switch controllers for multi-port PoE implementations
• Complies with IEEE 802.3af classification and signaling protocols
• Includes internal high-side switches to reduce external component count

Applications

• Multi-port Power over Ethernet hubs and switches
• PoE midspan injectors requiring multiple isolated ports
• Network infrastructure equipment with integrated power sourcing

Procurement Notes

Verify the suffix #TRPBF indicates tape-and-reel packaging distinct from tube variants. Confirm the CGW industrial temperature grade matches system requirements. Ensure the SSOP-36 footprint aligns with PCB layout constraints. Cross-reference the specific datasheet revision for any pinout or electrical characteristic updates prior to final design approval.

Selection Notes

Select this component when designing systems requiring four separate IEEE 802.3af compliant ports. The integrated switch architecture simplifies bill of materials compared to discrete solutions. Verify that the 425 mA per-channel limit meets downstream Powered Device demands. Consider thermal management strategies given the density of four channels in the SSOP-36 package.

Part Context

This part belongs to the LTC4258 family of PoE PSE controllers. It serves as a specialized solution for network hardware manufacturers needing compact, multi-port power distribution. The device complements other Analog Devices interface and power management ICs used in complete networking subsystems.

Replacement Considerations

Check for direct substitutes within the same series offering different package options or updated revisions. Evaluate alternative multi-channel PSE controllers if higher current limits or additional features are required.