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Product Detailed Parameters
- Description：IC POE CNTRL 8 CHANNEL 40QFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Controller (PSE)
- Number of Channels：8
- Power - Max：71.3 W
- Internal Switch(s)：No
- Auxiliary Sense：No
- Standards：802.3at (PoE+), 802.3af (PoE), 802.3bt
- Voltage - Supply：3V ~ 3.6V
- Current - Supply：-
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：40-WFQFN Exposed Pad
- Supplier Device Package：40-QFN (6x6)
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Overview
The LTC4292IUJ#TRPBF is a four-port Power Sourcing Equipment (PSE) controller compliant with IEEE 802.3bt Type 3 and Type 4 standards. It supports legacy 802.3af and 802.3at Powered Devices (PDs). The device utilizes low RDS(ON) external MOSFETs and a 0.15Ω sense resistance per channel to minimize heat dissipation. It features transformer-isolated communication for host interface, eliminating the need for opto-couplers. Key specifications include a maximum on-resistance of 150 mOhms, an operating supply voltage of 3.3 V, and a total output power capacity of 71.3 W.
Feature Summary
- Supports IEEE 802.3bt Type 3 and Type 4 PoE standards with backward compatibility for 802.3af and 802.3at
- Utilizes transformer-isolated communication protocol to replace opto-couplers and complex isolated supplies
- Provides per-port 14-bit current monitoring and programmable current limit capabilities
- Features proprietary multipoint detection mechanism for PD identification with immunity from false positives
Applications
- IEEE 802.3bt Type 3 and Type 4 Power over Ethernet systems
- Power sourcing equipment controllers for network infrastructure
- High-power PoE applications requiring efficient thermal management
Procurement Notes
Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing. Confirm that the component matches the QFN-40 package dimensions and pinout requirements for your PCB layout. Ensure the design accommodates the necessary external MOSFETs and sense resistors as the controller manages but does not integrate these power components internally.
Selection Notes
Select this component for designs requiring high-efficiency power delivery in PoE applications. The integrated transformer-isolated communication simplifies system architecture by removing isolation barriers typically required for host control. Consider the 150 mOhm on-resistance for thermal calculations and ensure the external MOSFET selection aligns with the desired power budget and efficiency targets.
Part Context
This part belongs to the LTC4291/LTC4292 chipset family designed specifically for advanced PoE implementations. It serves as a PSE controller intended to manage power distribution to compliant devices. The series focuses on reducing bill of materials costs and heat generation through optimized internal architecture and external component integration strategies.
Replacement Considerations
The LTC4291IUF#PBF is a documented substitute within the same chipset family. Verify functional equivalence regarding port count and standard compliance before substitution.
