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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：90 W
- Internal Switch(s)：No
- Auxiliary Sense：Yes
- Standards：802.3at (PoE+), 802.3af (PoE), LTPoE++
- Voltage - Supply：60V (Max)
- Current - Supply：2mA (Max)
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：28-WFQFN Exposed Pad
- Supplier Device Package：28-QFN (4x5)
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Overview
The LT4276AIUFD#PBF is a Powered Device (PD) controller supporting IEEE 802.3 and LTPoE++ standards. It integrates an isolated switching regulator controller for forward and flyback topologies with auxiliary power support. Input voltage ranges from 37V to 57V. Output configurations include 5V at 13A (70W), 12V at 7A (90W), 5V at 4.7A (25.5W), 12V at 1.9A, 24V at 1A, and 5V at 2.3A (13W). Efficiency reaches 94%. The device operates within a temperature range of -40°C to +125°C in a QFN-28 package.
Feature Summary
- Supports IEEE 802.3af/at PoE/PoE+ and LTPoE++ Powered Device classifications
- Integrates isolated switching regulator controller for synchronous forward and flyback topologies
- Includes auxiliary power support capabilities
- Pin-for-pin compatible across the LT4276 family
Applications
- LTPoE++ Powered Device power supplies up to 90W
- PoE+ Type 2 power supplies up to 25.5W
- Standard PoE Type 1 power supplies up to 13W
- Isolated DC-DC conversion in network infrastructure equipment
Procurement Notes
Verify the specific suffix #PBF indicates lead-free compliance when ordering. Confirm the QFN-28 package availability matches your assembly requirements. Ensure the input voltage range of 37V to 57V aligns with your PoE source specifications. Check for any regional distribution restrictions or limited supply status before finalizing procurement plans.
Selection Notes
Select this component for applications requiring high-efficiency isolated power conversion from PoE sources. The integrated controller simplifies design for both forward and flyback topologies. Consider the thermal performance within the -40°C to +125°C operating range. Verify that the required output power, such as 90W for LTPoE++, is supported by the chosen topology and external components.
Part Context
The LT4276 series comprises pin-for-pin compatible PD controllers for IEEE 802.3 and LTPoE++ standards. The AIUFD variant specifically denotes the industrial temperature grade and QFN-28 package configuration. This family supports various output powers ranging from 13W to 90W depending on the application circuit design and topology selected.
FAQ
What topologies does the LT4276AIUFD support?
It supports both forward and flyback topologies with synchronous operation.
What is the maximum output power for LTPoE++ applications?
The device supports up to 90W in LTPoE++ applications.
