LTC4263CDE#PBF

Overview

The LTC4263CDE#PBF is a Power Sourcing Equipment (PSE) controller with an integrated high-side switch, designed for IEEE 802.3af compliant PoE applications. It operates within a supply voltage range of 33 V to 66 V and supports a maximum current limit of 425 mA. The device features a maximum on-resistance of 3 Ohms and consumes a typical operating supply current of 2 mA. Packaged in a 14-lead DFN enclosure, it functions reliably across temperatures from 0°C to +70°C.

Feature Summary

• Integrates a high-side power switch with the PSE controller logic
• Complies with IEEE 802.3af PoE standards
• Supports operation up to 66 V input voltage

Applications

• IEEE 802.3af Power over Ethernet systems
• PoE-powered network devices
• Industrial LAN power sourcing equipment

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm package type and temperature grade. Ensure compatibility with existing PCB footprints for the DFN-14 package. Confirm regulatory compliance status such as RoHS directly from the manufacturer datasheet before integration.

Selection Notes

Select this component for designs requiring a compact solution that combines control logic and switching capability. Consider the 3 Ohm on-resistance for thermal management and efficiency calculations. Verify that the 425 mA current limit aligns with the downstream load requirements of the target application.

Part Context

This part belongs to the LTC4263 series of PoE controllers. It serves as a complete solution for implementing Class 0 or Class 1 PSE ports. The integration reduces external component count compared to discrete implementations using separate controllers and MOSFETs.

Replacement Considerations

Consult Analog Devices technical support for verified direct replacements. Cross-referencing requires matching pinout, electrical specifications, and package dimensions.