LTC4291 Series

4-Port IEEE 802.3bt PoE PSE Controller

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

4-Port IEEE 802.3bt PoE PSE Controller

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

Catalog

4-Port IEEE 802.3bt PoE PSE Controller

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.