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Product Detailed Parameters
- Description：IC POE CNTRL 1 CHANNEL 28QFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Type：Controller (PD), DC/DC
- Number of Channels：1
- Power - Max：25.5 W
- Internal Switch(s)：No
- Auxiliary Sense：Yes
- Standards：802.3at (PoE+), 802.3af (PoE)
- Voltage - Supply：60V (Max)
- Current - Supply：2mA (Max)
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：28-WFQFN Exposed Pad
- Supplier Device Package：28-QFN (4x5)
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Overview
The LT4276BHUFD#PBF is a Powered Device (PD) controller supporting IEEE 802.3af/at and LTPoE++ standards, housed in a 28-lead QFN package. It operates within a supply voltage range up to 60V and functions across temperatures from -40°C to +125°C. The device integrates an isolated switching regulator controller for forward and flyback topologies with auxiliary power support. Typical application circuits demonstrate outputs of 12V at 1.9A (25.5W), 24V at 1A (25.5W), 5V at 13A (70W), and 12V at 7A (90W).
Feature Summary
- Supports IEEE 802.3af/at PoE+ and LTPoE++ Powered Device classifications.
- Integrates an isolated switching regulator controller for synchronous forward and flyback topologies.
- Includes auxiliary power input support for enhanced operational flexibility.
Applications
- Type 2 PoE+ powered devices requiring 25.5W output.
- LTPoE++ powered devices utilizing forward topology for higher power levels such as 70W or 90W.
- Systems requiring combined PoE and auxiliary power inputs.
Procurement Notes
Verify the specific suffix #PBF indicates lead-free tape-and-reel or tube packaging configuration appropriate for your assembly process. Confirm that the 28-QFN footprint matches your PCB design guidelines. Ensure compatibility with the intended PoE standard, whether 802.3at or LTPoE++, as performance characteristics vary by classification. Check current availability status as distribution may be limited.
Selection Notes
Select this component when designing Powered Devices requiring integrated PD control and isolated DC/DC conversion. It is suitable for applications needing support for both standard PoE+ and high-power LTPoE++ protocols. Consider the thermal performance of the QFN package for high-power implementations like 90W designs. Verify that the external transformer and switch components align with the controller's drive capabilities for the chosen topology.
Part Context
This part belongs to the LT4276 family of pin-for-pin compatible controllers. The series supports various power classifications through different suffixes and operating modes. It serves as a central management IC for Power over Ethernet applications, combining link layer detection with isolated power regulation.
FAQ
What topologies does the LT4276BHUFD#PBF support?
It supports synchronous operation in both forward and flyback topologies for the isolated switching regulator.
Does this controller support auxiliary power?
Yes, it includes dedicated support for auxiliary power inputs alongside PoE power.
