LTC4274C

FEATURES nn Compliant with IEEE 802.3at Type 1 and 2 nn Low Power Dissipation nn 0.25Ω Sense Resistance Per Channel nn Very High Reliability 4-Point PD Detection nn 2-Point Forced Voltage nn 2-Point Forced Current nn High Capacitance Legacy Device Detection nn 1MHz I2C Compatible Serial Control Interface nn Midspan Backoff Timer nn Supports 2-Pair and 4-Pair Output Power nn Available in Multiple Power Grades nn LTC4274A-1: LTPoE++™ 38.7W nn LTC4274A-2: LTPoE++ 52.7W nn LTC4274A-3: LTPoE++ 70W nn LTC4274A-4: LTPoE++ 90W nn LTC4274C: PoE 13W nn Available in 38-Lead 5mm × 7mm QFN Package APPLICATIONS nn LTPoE++ PSE Switches/Routers nn LTPoE++ PSE Midspans nn IEEE 802.3at Type 1 PSE Switches/Routers nn IEEE 802.3at Type 1 PSE Midspans L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTPoE++ are trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. LTC4274A/LTC4274C Single PoE/PoE+/LTPoE++ PSE Controller DESCRIPTION The LTC®4274A 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...