LTC4274ALTC4274C Series

Single PoE/PoE+/LTPoE++ PSE Controller

Catalog

Single PoE/PoE+/LTPoE++ PSE Controller

Part	Standards	Number of Channels	Current - Supply	Operating Temperature [Max]	Operating Temperature [Min]	Mounting Type	Package / Case	Type	Voltage - Supply [Min]	Voltage - Supply [Max]	Power - Max [Max]
Analog Devices LTC4274AIUHF-2#TRPBF	802.3af 802.3at LTPoE++	1	2.4 mA	85 °C	-40 °C	Surface Mount	38-WFQFN Exposed Pad	Controller (PSE)	45 V	57 V
Analog Devices LTC4274IUHF#PBF	802.3af (PoE) 802.3at (PoE+)	1	1.1 mA	85 °C	-40 °C	Surface Mount	38-WFQFN Exposed Pad	Controller (PSE)	3 V	4.3 V	25.5 W
Analog Devices LTC4274CUHF#PBF	802.3af (PoE) 802.3at (PoE+)	1	1.1 mA	70 °C	0 °C	Surface Mount	38-WFQFN Exposed Pad	Controller (PSE)	3 V	4.3 V	25.5 W
Analog Devices LTC4274AIUHF-4#PBF	802.3af 802.3at LTPoE++	1	2.4 mA	85 °C	-40 °C	Surface Mount	38-WFQFN Exposed Pad	Controller (PSE)	45 V	57 V	90 W

Catalog

Single PoE/PoE+/LTPoE++ PSE Controller

Key Features

• Compliant with IEEE 802.3at Type 1 and 2

• Low Power Dissipation

• 0.25Ω Sense Resistance Per Channel

• Very High Reliability 4-Point PD Detection

• 2-Point Forced Voltage

• 2-Point Forced Current

• High Capacitance Legacy Device Detection

• 1MHz I2C Compatible Serial Control Interface

• Midspan Backoff Timer

• Supports 2-Pair and 4-Pair Output Power

• Available in Multiple Power Grades

• Available in 38-Lead 5mm × 7mm QFN Package

Description

The LTC4274A is a single 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 LTC4274A feature set is a superset of the popular LTC4274. 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 LTC4274C targets fully automatic PSE systems powering Type 1 (up to 13W) PDs.Advanced power management features include: a 14-bit current monitoring ADC, DAC-programmable current limit, and versatile quick port shutdown. PD Discovery uses a proprietary dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. The LTC4274A/LTC4274C includes an I2C serial interface operable up to 1MHz.The LTC4274A/LTC4274C 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