LTC4291-1 Series

4-Port IEEE 802.3bt PoE PSE Controller

Catalog

4-Port IEEE 802.3bt PoE PSE Controller

Part	Current - Supply	Mounting Type	Number of Channels	Operating Temperature [Max]	Operating Temperature [Min]	Power - Max [Max]	Package / Case	Supplier Device Package	Standards	Type	Voltage - Supply [Max]	Voltage - Supply [Min]
Analog Devices LTC4291IUF-1#PBF	10 mA	Surface Mount	8	85 °C	-40 °C	71.3 W	24-WFQFN Exposed Pad	24-QFN (4x4)	802.3af (PoE) 802.3at (PoE+) 802.3bt	Controller (PSE)	3.6 V	3 V
Analog Devices LTC4291IUF-1#TRPBF	10 mA	Surface Mount	8	85 °C	-40 °C	71.3 W	24-WFQFN Exposed Pad	24-QFN (4x4)	802.3af (PoE) 802.3at (PoE+) 802.3bt	Controller (PSE)	3.6 V	3 V
Analog Devices LTC4291IUF#TRPBF		Surface Mount	8	85 °C	-40 °C	71.3 W	24-WFQFN Exposed Pad	24-QFN (4x4)	802.3af (PoE) 802.3at (PoE+) 802.3bt	Controller (PSE)	3.6 V	3 V

Catalog

4-Port IEEE 802.3bt PoE PSE Controller

Key Features

• Four PSE PortsTwo Power Channels per Port

• Two Power Channels per Port

• 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

• 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

• 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) and 24-Lead 4mm × 4mm (LTC4291-1) QFN Packages

Description

The LTC4291-1 /LTC4292chipset 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 LTC4291-1 / LTC4292 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC4291-1 / LTC4292 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 per-port 14-bit current monitoring, programmable current limit, and versatile fast shutdown 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 LTC4291-1 / LTC4292 includes an I2C serial interface operable up to 1MHz. The LTC4291-1/LTC4292 is pin or I2C programmable to negotiate PD delivered power up to 71.3W.