Analog Devices Inc. LT4295 IEEE 802.3bt PD Interfaces

Analog Devices Inc. LT4295 IEEE 802.3bt PD Interfaces feature a forward/flyback controller and is an IEEE 802.3af/at/bt(Draft 2.0)-compliant powered device (PD). The T2P output indicates the number of classification events received during IEEE 802.3bt-compliant mutual identification and negotiation of available power.

The Analog Devices LT4295 series support forward and flyback power supply topologies. The flyback topology supports No-Opto feedback. Auxiliary input voltages can be accurately sensed with just a resistor divider connected to the AUX pin.


  • IEEE 802.3af/at/bt(Draft 2.0) powered device (PD) with forward/flyback controller
  • Supports up to 71WPDs
  • 5-event classification sensing
  • Superior surge protection (100V absolute maximum)
  • -40°C to +125°C junction temperature range
  • >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 mgration of LTPoE++® PDs to IEEE 802.3bt PDs
  • Pin compatible with LT4276A/B/C
  • 28-lead 4mm × 5mm QFN package


  • High power wireless data systems
  • Outdoor security camera equipment
  • Commercial and public information displays
  • High-temperature

Typical Application

Application Circuit Diagram - Analog Devices Inc. LT4295 IEEE 802.3bt PD Interfaces
Published: 2017-04-24 | Updated: 2022-03-11