LTC4291IUF-1#TRPBF

Overview

The LTC4291IUF-1#TRPBF is a four-port Power Sourcing Equipment (PSE) controller compliant with IEEE 802.3bt Type 3 and Type 4 standards. It operates within a supply voltage range of 3V to 3.6V and draws a typical supply current of 10mA. The device utilizes a 24-pin QFN package with exposed pad, rated for industrial temperatures from -40°C to +85°C. Designed for low heat dissipation, it features low RDS(ON) external MOSFET control.

Feature Summary

• Supports IEEE 802.3at PoE+ and 802.3bt PoE++ power delivery protocols
• Provides digital host interface via serial communication for system control
• Integrates protection mechanisms including thermal shutdown and overcurrent limiting

Applications

• IEEE 802.3bt Type 3 and Type 4 PoE switches
• Midspan power injection devices
• Industrial networking equipment requiring high-power port distribution

Procurement Notes

Verify the specific suffix '-1' against the manufacturer datasheet to confirm pinout or feature variations relative to the standard LTC4291. Ensure the component meets RoHS3 compliance requirements for your target market. Confirm that the 24-QFN package dimensions align with your PCB footprint design guidelines.

Selection Notes

Select this controller when designing systems requiring support for the highest power tiers defined in the 802.3bt standard. It is suitable for applications needing efficient power management through external N-channel MOSFETs. Consider the thermal performance benefits provided by the low on-resistance switching architecture for dense switch designs.

Part Context

This component belongs to the LTC429x series of PoE controllers manufactured by Analog Devices Inc. The series is engineered to deliver industry-leading efficiency and minimal heat generation for multi-port Ethernet infrastructure. It serves as a core power management solution for modern network switches supporting advanced power-over-Ethernet standards.

Replacement Considerations

The LTC4292 is a compatible alternative within the same chipset family designed for similar 802.3bt applications. Verify functional equivalence regarding port count and protocol support before substitution.