LT4295

RECOMMENDED FOR NEW DESIGNS

IEEE 802.3bt PD Interface with Forward/Flyback Controller

Data Sheet (Rev. B) Product Selection Table
Part Models
4
1ku List Price
Starting From $2.58
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Part Details

  • IEEE 802.3af/at/bt Powered Device (PD) with Forward/Flyback Controller
  • Supports Up to 71.3W PDs
  • 5-Event Classification Sensing
  • Superior Surge Protection (100V Absolute Maximum)
  • Wide Junction Temperature Range (–40°C to 125°C)
  • >94% End-to-End Efficiency with LT4321 Ideal Bridge
  • External Hot Swap N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
  • No-Opto Flyback Operation
  • Auxiliary Power Support as Low as 9V
  • Easy Migration of LTPoE++® PDs to IEEE 802.3bt PDs
  • Pin Compatible with LT4276A/B/C
  • 28-Lead 4mm × 5mm QFN Package
LT4295
IEEE 802.3bt PD Interface with Forward/Flyback Controller
LT4295 Application Circuit LT4295 Pin configuration
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 4

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Ideal Diode Bridge 1
LT4320
LT4320-1
Ideal Diode Bridge Controller
PowerPath, Ideal Diodes, and Load Switches 1
LT4321
RECOMMENDED FOR NEW DESIGNS PoE Ideal Diode Bridge Controller
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT4295
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
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DC2584A-A

LT4295/LT4321 Demo Board | PoE++ (71W/12V/5.5A) PD with Forward DC/DC and Ideal Diode Bridge

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Product Details

Demonstration circuit 2584A is an IEEE 802.3bt (Draft 2.1) compliant Power over Ethernet (PoE) Powered Device (PD). It features the LT4295 PD interface and switching regulator controller and the LT4321 PoE ideal diode bridge controller.

eval board
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DC2539A-A

LT4295/LT4321 Demo Board | PoE++ (51W, 12V/3.9A) PD with Flyback DC/DC and Ideal Diode Bridge

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Product Details

Demonstration circuit 2539A is an IEEE802.3bt (Draft 2.1) compliant Power over Ethernet (PoE) Powered Device (PD). It features the LT4295 PD interface and switching regulator controller and the LT4321 PoE ideal diode bridge controller.

eval board
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DC2476A-A

LT4295/LT4321 Demo Board | PoE++ (71W/24V/2.7A or 62W/24V/2.3A) PD with Flyback DC/DC and Ideal Diode Bridge

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Product Details

Demonstration Circuit 2476A is an Ethernet Alliance™ Gen 2 PoE certified IEEE 802.3bt compliant power over ethernet (PoE) powered device (PD). It features the LT4295 PD interface and switching regulator controller and the LT4321 PoE ideal diode bridge controller.

The LT4295 provides IEEE 802.3af (PoE, Type 1), IEEE 802.3at (PoE+, Type 2), and IEEE 802.3bt (PoE++, Type 3 and 4) compliant interfacing and power supply control. It utilizes an external, low RDS(on) (30mΩ typical) N-channel FET for the hot swap function to improve efficiency. The LT4295 controls a DC/DC converter that utilizes a highly efficient flyback topology with synchronous rectification.

The LT4321 controls eight low RDS(on) (30mΩ typical) N-channel FETs to further improve end-to-end power delivery efficiency and ease thermal design. This solution replaces the eight diodes typically found in a passive PoE rectifier bridge.

The DC2476A-A accepts up to 71.3W of delivered power from a power sourcing equipment (PSE) via the RJ45 connector (J1) or a local 48V DC power supply using the auxiliary supply input. When both supplies are connected, the auxiliary supply input has priority over the PoE input. The DC2476A-A supplies a 24V output at up to 2.7A as a Class 8 (71.3W) PD and up to 2.4A as a Class 7 (62W) PD application.

eval board
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DC2475A-A

LT4295/LT4321 Demo Board | PoE++ (40W, 12V/3A) PD with Flyback DC/DC and Ideal Diode Bridge

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Product Details

Demonstration circuit 2475A-A is an Ethernet Alliance™ certified IEEE802.3bt compliant Power over Ethernet (PoE) powered device (PD). It features the LT4295 PD interface and switching regulator controller with the LT4321 PoE ideal diode bridge controller.
DC2584A-A
LT4295/LT4321 Demo Board | PoE++ (71W/12V/5.5A) PD with Forward DC/DC and Ideal Diode Bridge
DC2584A-A Demo Board DC2584A-A Demo Board DC2584A-A Demo Board DC2584A-A Demo Board DC2584A-A Demo Board
DC2539A-A
LT4295/LT4321 Demo Board | PoE++ (51W, 12V/3.9A) PD with Flyback DC/DC and Ideal Diode Bridge
DC2539A-A Demo Board DC2539A-A Demo Board DC2539A-A Demo Board DC2539A-A Demo Board DC2539A-A Demo Board DC2539A-A - Schematic
DC2476A-A
LT4295/LT4321 Demo Board | PoE++ (71W/24V/2.7A or 62W/24V/2.3A) PD with Flyback DC/DC and Ideal Diode Bridge
DC2476A-A Demo Board DC2476A-A Demo Board DC2476A-A Demo Board DC2476A-A Demo Board DC2476A-A Demo Board Ethernet Alliance Certified 2.0 Power over Ethernet (PoE)
DC2475A-A
LT4295/LT4321 Demo Board | PoE++ (40W, 12V/3A) PD with Flyback DC/DC and Ideal Diode Bridge
DC2475A-A Demo Board DC2475A-A Demo Board DC2475A-A Demo Board DC2475A-A Demo Board DC2475A-A Demo Board DC2475A-A Application Circuit DC2475A-A Application Circuit DC2475A-A Application Circuit EA Certified 4

Latest Discussions

6 Weeks Ago
Disable Controller when there is Power Demotion
17 Weeks Ago
DC2476A-A 71W 12V design modification
26 Weeks Ago
EVM(DC2584A-A) circuit related doubt
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