LTC4264CDE#PBF

Overview

The LTC4264CDE#PBF is a high-power Powered Device (PD) interface controller compliant with IEEE 802.3at (PoE+) and 802.3af standards. It integrates a 750mA current-limited power switch, enabling direct connection to PoE-powered systems without external discrete components. The device operates within a supply voltage range of 37.5V to 57V and supports output voltages up to 60V. Packaged in a compact 12-lead DFN (4x3mm) format, it facilitates efficient thermal management for space-constrained designs.

Feature Summary

• Integrates a 750mA current-limited power switch for simplified circuit design
• Supports IEEE 802.3at Type 2 and 802.3af Powered Device classifications
• Eliminates the need for external optocouplers or flyback converters

Applications

• Wireless access points requiring PoE+ power delivery
• IP security cameras with integrated heating or lighting
• Industrial IoT sensors powered via Ethernet infrastructure

Procurement Notes

Verify the specific suffix '#PBF' confirms lead-free RoHS compliance and tin lead termination finish. Confirm the 'DE' package code corresponds to the 12-lead DFN variant. Ensure compatibility with your system's input voltage profile against the specified 37.5V to 57V operating range before finalizing procurement.

Selection Notes

Select this component when designing a PD that requires integrated switching capabilities to reduce bill-of-materials count. It is suitable for applications needing up to 25.5W of power where external switching transistors would otherwise be required. Consider the 12-DFN footprint constraints and thermal dissipation requirements relative to the 750mA internal switch limit.

Part Context

This part belongs to Analog Devices' LTC4264 family of PoE controllers. It serves as an alternative to solutions using separate controllers and MOSFETs. The device simplifies the implementation of high-power Ethernet interfaces by combining classification, signaling, and power switching functions into a single monolithic IC.

Replacement Considerations

Direct substitutes include other IEEE 802.3at PD controllers from Analog Devices such as the LTC4265 series, provided pinout and current limits match the design requirements. Verify functional equivalence regarding classification logic and switch current ratings.