LT4294

PRODUCTION

IEEE 802.3bt PD Interface Controller

Analog Devices LT4294 Product Info

10 February 2026 6

Features

IEEE 802.3af/at/bt Powered Device (PD) 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)
Overtemperature Protection

Integrated Signature Resistor
External Hot Swap N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
Configurable Aux Power Support as Low as 9V
Easy Migration Between LTPoE++^® PDs and IEEE 802.3bt PDs
Pin Compatible with LT4275A/B/C
Available in 10-Lead MSOP and 3mm × 3mm DFN Packages

Part details & applications

The LT4294 is an IEEE 802.3af/at/bt-compliant powered device (PD) interface controller. The T2P output indicates the number of classification events received during IEEE 802.3bt-compliant mutual identification and negotiation of available power.

The LT4294 utilizes an external, low R_DS(ON) N-channel hot swap MOSFET and supports the LT4320/LT4321 ideal diode bridges, to extend the end-to-end power delivery efficiency and eliminate costly heat sinks. The LT4294 also includes a power good output, onboard signature resistor, undervoltage lockout, and thermal protection. Start-up inrush current is adjustable with an external capacitor. Auxiliary power override is supported as low as 9V with the AUX pin.

The LT4294 can be configured to support all possible 802.3bt, 802.3at and 802.3af power levels with external component changes. Pin-for-pin compatibility with the LT4275 family of PD Interface Controllers enables easy migration between LTPoE++ PDs and IEEE 802.3bt-compliant PDs.

Applications

High Power Wireless Data Systems
Outdoor Security Camera Equipment
Commercial and Public Information Displays
High Temperature Industrial Applications

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