LTC4292 Series

4-Port PoE++ PSE Analog Controller

Catalog

4-Port PoE++ PSE Analog Controller

Part	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Voltage - Supply [Max]	Voltage - Supply [Min]	Type	Standards	Auxiliary Sense	Mounting Type	Number of Channels	Supplier Device Package	Power - Max [Max]	Internal Switch(s)
Analog Devices LTC4292IUJ#PBF	85 °C	-40 °C	40-WFQFN Exposed Pad	3.6 V	3 V	Controller (PSE)	802.3af (PoE) 802.3at (PoE+) 802.3bt		Surface Mount	8	40-QFN (6x6)	71.3 W
Analog Devices LTC4292IUJ#TRPBF	85 °C	-40 °C	40-WFQFN Exposed Pad	3.6 V	3 V	Controller (PSE)	802.3af (PoE) 802.3at (PoE+) 802.3bt		Surface Mount	8	40-QFN (6x6)	71.3 W

Catalog

4-Port PoE++ PSE Analog Controller

Key Features

• Four PSE PortsTwo Power Channels Per Port

• Two Power Channels Per Port

• Fully Compliant IEEE 802.3bt Type 3 and 4 PSECompliant Support for Type 1, 2, 3, and 4 PDs

• Compliant Support for Type 1, 2, 3, and 4 PDs

• Low Power Path Dissipation per Channel150mΩ Sense Resistance30mΩ or Lower MOSFET RDS(ON)

• 150mΩ Sense Resistance

• 30mΩ or Lower MOSFET RDS(ON)

• Chipset Provides Electrical IsolationEliminates Optos and Isolated 3.3V Supply

• Eliminates Optos and Isolated 3.3V Supply

• Very High Reliability Multipoint PD DetectionConnection Check Distinguishes Single-Signature and Dual-Signature PDs

• Connection Check Distinguishes Single-Signature and Dual-Signature PDs

• Continuous, Dedicated Per-Port Power and Current MonitoringPer-Port Power Policing

• Per-Port Power Policing

• 1MHz I2C Compatible Serial Control Interface

• Pin or I2C Programmable PD Power Up to 71.3W

• Available in a 40-Lead 6mm × 6mm (LTC4292) QFN Package

Description

The LTC4292/LTC4291chipset is a 4-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC4292/LTC4291 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC4292/LTC4291 chipset delivers lowest-in-industry heat dissipation by utilizing low-RDS(ON)external MOSFETs and 0.15Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V supply, resulting in significant BOM cost savings.Advanced power management features include perport 14-bit current monitoring, programmable current limit, and versatile fast shut-down of preselected ports. Advanced power management host software is available under a no-cost license. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC4292/LTC4291 includes an I2C serial interface operable up to 1MHz. The LTC4292/LTC4291 is pin or I2C programmable to negotiate PD delivered power up to 71.3W.