Analog Devices LT4294

Description

The LT®4294 is an IEEE 802.3af/at/bt (Draft 2.3)-compliantpowered device (PD) interface controller. The T2P outputindicates the number of classification events receivedduring IEEE 802.3bt-compliant mutual identification andnegotiation of available power.The LT4294 utilizes an external, low RDS(ON) N-channelhot swap MOSFET and supports the LT4320/LT4321 idealdiode bridges, to extend the end-to-end power deliveryefficiency and eliminate costly heat sinks. The LT4294also includes a power good output, onboard signatureresistor, undervoltage lockout, and thermal protection.Start-up inrush current is adjustable with an externalcapacitor. Auxiliary power override is supported as lowas 9V with the AUX pin.The LT4294 can be configured to support all possible802.3bt, 802.3at and 802.3af power levels with externalcomponent changes. Pin-for-pin compatibility with theLT4275 family of PD Interface Controllers enables easymigration between LTPoE++ PDs and IEEE 802.3btcompliantPDs.

Features

IEEE 802.3af/at/bt (Draft 2.3) Powered Device (PD)Controllernn Supports Up to 71W PDsnn 5-Event Classification Sensingnn Superior Surge Protection (100V Absolute Maximum)nn Wide Junction Temperature Range (–40°C to 125°C)nn Overtemperature Protectionnn Integrated Signature Resistornn External Hot Swap N-Channel MOSFET for LowestPower Dissipation and Highest System Efficiencynn Configurable Aux Power Support as Low as 9Vnn Easy Migration Between LTPoE++® PDs and IEEE802.3bt PDsnn Pin Compatible with LT4275A/B/Cnn Available in 10-Lead MSOP and 3mm × 3mm DFNPackages

Typical applications

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

More information

• Datasheet
• IC product information