LTC4290BIUJ#TRPBF

Overview

The LTC4290BIUJ#TRPBF is an IEEE 802.3at-compliant Power Sourcing Equipment (PSE) controller manufactured by Analog Devices Inc. It operates within a supply voltage range of 36V to 57V and supports a maximum output power of 25.5W per port. The device integrates a low on-resistance N-channel MOSFET switch with a typical resistance of 1.2Ω. It features a fixed switching frequency of 1MHz and includes comprehensive protection mechanisms such as overvoltage, undervoltage, and thermal shutdown. The component is housed in a thermally enhanced 28-lead SSOP package.

Feature Summary

• Integrates a single-port PSE controller with an internal high-voltage N-channel MOSFET switch for compact design
• Provides precise current limit control with programmable slope compensation for stable operation under varying load conditions
• Includes digital fault reporting and status flags via the INT pin for system monitoring and diagnostics

Applications

• IEEE 802.3at PoE midspan injectors
• Single-port PoE power sourcing equipment
• Industrial automation network nodes requiring isolated power delivery
• Security camera power distribution units

Procurement Notes

Verify the specific suffix 'IUJ' against the official Analog Devices datasheet to confirm package type and temperature grade. Ensure compatibility with your PCB footprint for the 28-lead SSOP package. Confirm that the intended application requires IEEE 802.3at compliance rather than 802.3af or 802.3bt standards. Check for any recent lifecycle notices regarding obsolescence or last-time buy dates from the manufacturer.

Selection Notes

Select this component when a single-port solution is required for 802.3at compliant systems. It is suitable for designs needing integrated switch management to reduce external component count. Consider the thermal performance of the SSOP package if high ambient temperatures are expected. Compare against multi-port controllers if multiple ports are needed to optimize board space and cost efficiency.

Part Context

This part belongs to the LTC4290 family of PoE PSE controllers designed for reliable power delivery over Ethernet cables. It complements other variants like the LTC4290BIDE and LTC4290BIUDC, which offer different package options such as DFN or QFN. The family is engineered to meet strict IEEE standards while minimizing heat dissipation through efficient switching regulation and robust protection features.

Replacement Considerations

Direct substitutes include other parts within the LTC4290 series with compatible packages, such as the LTC4290BIUDC#TRPBF for DFN packaging. Cross-reference with LTC4290 variants offering similar electrical characteristics but different thermal profiles. Verify pin-to-pin compatibility before replacing to ensure no redesign of the PCB layout is necessary.