LT4275CHDD#TRPBF

Overview

The LT4275CHDD#TRPBF is a Powered Device (PD) controller from Analog Devices, designed for IEEE 802.3af compliant PoE applications. It operates within a supply voltage range of 23V to 60V and supports a maximum power output of 13W. The device utilizes an external N-channel MOSFET driven by an internal charge pump to minimize conduction losses and simplify thermal management. It features a 10-lead DFN package with exposed pad (3mm x 3mm) for surface mount assembly.

Feature Summary

• Supports IEEE 802.3af Type 1 PoE standards with integrated signature resistance
• Utilizes an internal charge pump to drive an external N-channel MOSFET for low-loss power switching
• Includes comprehensive protection mechanisms such as undervoltage lockout and thermal shutdown

Applications

• IEEE 802.3af compliant network endpoints
• Wireless access points requiring standard PoE power
• IP cameras and VoIP phones in commercial infrastructure

Procurement Notes

Verify the specific suffix DD against the manufacturer's official datasheet to confirm the 3x3 DFN package configuration. Ensure the component meets RoHS compliance requirements for your target market. Confirm that the TRPBF designation corresponds to the tape-and-reel packaging format required for your automated assembly line processes.

Selection Notes

Select this component when designing systems strictly adhering to IEEE 802.3af power budgets. It is suitable for applications where cost-effective thermal management is prioritized over high-power delivery. Consider the external MOSFET selection carefully to optimize efficiency and ensure compatibility with the controller's drive capabilities.

Part Context

This part belongs to the LT4275 family of PD controllers, which includes variants supporting higher power levels like LTPoE++ and IEEE 802.3at. While other family members support up to 90W, the LT4275C variant is specifically engineered for lower-power, legacy-compliant deployments. It shares pinouts with other LT4275 models but differs in supported classification protocols.

Replacement Considerations

LT4275BIDD#TRPBF: Supports higher power IEEE 802.3at standards; verify if increased power capability is acceptable. LT4275AHDD#TRPBF: Supports LTPoE++ and multiple power tiers; ensure backward compatibility with existing PSE infrastructure.