Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Device type | IEEE 802.3af/at/bt powered-device interface with DC/DC controller |
| Supported PD power | Up to 71.3 W class |
| Classification | Includes 5-event classification support |
| Converter control | Forward or flyback controller |
| Flyback feedback | No-optocoupler architecture supported |
| Hot-swap device | External N-channel MOSFET |
| Surge rating | 100 V absolute-maximum class |
| Package | 28-lead 4 mm × 5 mm QFN with exposed pad |
Product Overview
LT4295IUFD#PBF combines a Power over Ethernet powered-device interface with a forward/flyback DC/DC controller for IEEE 802.3af, 802.3at and 802.3bt systems. It supports high-power PD implementations up to the 71.3 W class and integrates detection, classification and power-interface control ahead of the isolated converter stage.
The controller uses an external hot-swap MOSFET rather than forcing surge and conduction loss into an internal pass device. That architecture allows the designer to choose MOSFET resistance and thermal performance for the intended PD power level.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| PoE standards | IEEE 802.3af / at / bt PD interface |
| PD power class | Up to 71.3 W |
| Classification | 5-event classification support |
| Converter topologies | Forward, flyback |
| Hot-swap element | External N-channel MOSFET |
| Auxiliary supply support | Down to 9 V class |
| Surge absolute maximum | 100 V class |
| Package | 28-lead 4 mm × 5 mm QFN with exposed pad |
| Exact model lifecycle | Production |
PoE and Converter Considerations
PD classification and the DC/DC power stage should be designed as one power budget. Cable power, classification level, converter efficiency and downstream load determine whether the requested application power is achievable at the load.
Using an external hot-swap MOSFET gives flexibility in on-resistance and surge capability, but also makes MOSFET SOA, inrush behavior and PCB thermal design part of the protection path.
Manufacturer Resource
Analog Devices LT4295 product page
Quality & Verification Support
Exact I-grade order code, QFN marking, lot/date information and PoE-controller traceability can be reviewed.
Request a Quote
Request LT4295IUFD#PBF exactly and include quantity, date-code and traceability requirements.
