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LTC4270 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4270 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 30 page  LTC4266A/LTC4266C 1 4266acfc n LTPoE++ PSE Switches/Routers n LTPoE++ PSE Midspans n IEEE 802.3at Type 1 PSE Switches/Routers n IEEE 802.3at Type 1 PSE Midspans APPLICATIONS FEATURES DESCRIPTION Quad PoE/PoE+/LTPoE++ PSE Controller The LTC®4266A 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 power- ing 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 al- lowing delivered PD power of 13W, 25W, 38.7W, 52.7W, 70W and 90W. These controllers are available in a 38-lead 5mm × 7mm QFN package. n Four Independent PSE Channels n Compliant with IEEE 802.3at Type 1 and 2 n Low Power Dissipation 0.25Ω Sense Resistance Per Channel n Very High Reliability 4-Point PD Detection 2-Point Forced Voltage 2-Point Forced Current n High Capacitance Legacy Device Detection n 1MHz I2C Compatible Serial Control Interface n Midspan Backoff Timer n Supports 2-Pair and 4-Pair Output Power n Available in Multiple Power Grades LTC4266A-1: LTPoE++™ 38.7W LTC4266A-2: LTPoE++ 52.7W LTC4266A-3: LTPoE++ 70W LTC4266A-4: LTPoE++ 90W LTC4266C: PoE 13W n Available in 38-Lead 5mm × 7mm QFN Package TYPICAL APPLICATION Complete 4-Port Ethernet High Power Source L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTPoE++ and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 4266 TA01 SCL SDAIN SDAOUT AD0 AD1 AD2 AD3 AGND VEE SENSE1 –50V 1μF SMAJ58A GATE1 OUT1 OUT2 OUT3 SENSE2 GATE2 SENSE3 GATE3 SENSE4 GATE4 OUT4 PORT1 –50V 0.22μF 100V 4 S1B 4 S1B 4 PORT2 PORT3 PORT4 DGND VDD INT SHDN1 SHDN2 AUTO MSD RESET SHDN3 SHDN4 MID 0.1μF 3.3V LTC4266 |
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Similar Description - LTC4270 |
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