LTC4266ALTC4266C Series

Quad IEEE 802.3at Power Over Ethernet Controller

Catalog

Quad IEEE 802.3at Power Over Ethernet Controller

Part	Operating Temperature [Max]	Operating Temperature [Min]	Type	Standards	Package / Case	Current - Supply	Mounting Type	Power - Max [Max]	Voltage - Supply [Min]	Voltage - Supply [Max]	Number of Channels	Package / Case [y]	Package / Case [y]	Supplier Device Package
Analog Devices LTC4266AIUHF-1#PBF	85 °C	-40 °C	Controller (PSE)	802.3af 802.3at LTPoE++	38-WFQFN Exposed Pad	2.4 mA	Surface Mount	38.7 W	45 V	57 V	4
Analog Devices LTC4266AIUHF-2#PBF	85 °C	-40 °C	Controller (PSE)	802.3af 802.3at LTPoE++	38-WFQFN Exposed Pad	2.4 mA	Surface Mount		45 V	57 V	4
Analog Devices LTC4266CGW#PBF	85 °C	-40 °C	Controller (PSE)	802.3af (PoE) 802.3at (PoE+)	36-BSOP	2.4 mA	Surface Mount	25.5 W	45 V	57 V	4	0.295 in	7.5 mm	36-SSOP
Analog Devices LTC4266IGW#PBF	85 °C	-40 °C	Controller (PSE)	802.3af (PoE) 802.3at (PoE+)	36-BSOP	2.4 mA	Surface Mount	25.5 W	45 V	57 V	4	0.295 in	7.5 mm	36-SSOP
Analog Devices LTC4266IGW#TRPBF	85 °C	-40 °C	Controller (PSE)	802.3af (PoE) 802.3at (PoE+)	36-BSOP	2.4 mA	Surface Mount	25.5 W	45 V	57 V	4	0.295 in	7.5 mm	36-SSOP
Analog Devices LTC4266AIUHF-4#PBF	85 °C	-40 °C	Controller (PSE)	802.3af 802.3at LTPoE++	38-WFQFN Exposed Pad	2.4 mA	Surface Mount	90 W	45 V	57 V	4
Analog Devices LTC4266CUHF#PBF	70 °C	0 °C	Controller (PSE)	802.3af (PoE) 802.3at (PoE+)	38-WFQFN Exposed Pad	3.5 mA	Surface Mount	25 W	45 V	57 V	4

Catalog

Quad IEEE 802.3at Power Over Ethernet Controller

Key Features

• Four Independent PSE Channels

• Compliant with IEEE 802.3at Type 1 and 2

• 0.34Ω Total Channel Resistance130mW/Port at 600mA

• 130mW/Port at 600mA

• Advanced Power Management8-Bit Programmable Current Limit (ILIM)7-Bit Programmable Overload Currents (ICUT)Fast Shutdown of Preselected Ports14.5-Bit Port Current/Voltage Monitoring2-Event Classification

• 8-Bit Programmable Current Limit (ILIM)

• 7-Bit Programmable Overload Currents (ICUT)

• Fast Shutdown of Preselected Ports

• 14.5-Bit Port Current/Voltage Monitoring

• 2-Event Classification

• Very High Reliability 4-Point PD Detection2-Point Forced Voltage2-Point Forced Current

• 2-Point Forced Voltage

• 2-Point Forced Current

• High Capacitance Legacy Device Detection

• LTC4259A-1 and LTC4258 Pin and SW Compatible

• 1MHz I2C Compatible Serial Control Interface

• Midspan Backoff Timer

• Supports Proprietary Power Levels Above 25W

• Available in 38-Pin 5mm × 7mm QFN and 36-Pin SSOP Packages

Description

The LTC4266A is a quad power sourcing equipment (PSE) controller capable of delivering up to 90W of LTPoE++ power to a compatible LTPoE++ powered device (PD). A proprietary detection/classification scheme allows mutual identification between a LTPoE++ PSE and LTPoE++ PD while remaining compatible and interoperable with existing Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4266A feature set is a superset of the popular LTC4266. These PSE controllers feature low RON external MOSFETs and 0.25Ω sense resistors which are especially important at the LTPoE++ current levels to maintain the lowest possible heat dissipation.The LTC4266C targets fully automatic PSE systems powering Type 1 (up to 13W) PDs.Advanced power management features include: 14-bit current monitoring ADCs, DAC-programmable current limit, and versatile quick shutdown of preselected ports. Advanced power management host software is available under a no-cost license. PD discovery uses a proprietary dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. The LTC4266 includes an I2C serial interface operable up to 1MHz.The LTC4266 is available in multiple power grades allowing delivered PD power of 13W, 25.5W, 38.7W, 52.7W, 70W and 90W. These controllers are available in a 38-lead 5mm × 7mm QFN package.ApplicationsLTPoE++ PSE Switches/RoutersLTPoE++ PSE MidspansIEEE 802.3at Type 1 PSE Switches/RoutersIEEE 802.3at Type 1 PSE Midspans