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LTC4274A Datasheet(PDF) 1 Page - Linear Technology |
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LTC4274A Datasheet(HTML) 1 Page - Linear Technology |
1 / 30 page LTC4274A/LTC4274C 1 4274acfd For more information www.linear.com/LTC4274A 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 Single PoE/PoE+/LTPoE++ PSE Controller The LTC®4274A is a single Power Sourcing Equipment (PSE)controllercapableofdeliveringupto90WofLTPoE++ power to a compatible LTPoE++ Powered Device (PD). A proprietarydetection/classificationschemeallowsmutual identification between a LTPoE++ PSE and LTPoE++ PD whileremainingcompatibleandinteroperablewithexisting 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. TheLTC4274CtargetsfullyautomaticPSEsystemspower- ing Type 1 (up to 13W) PDs. Advanced power management features include: a 14-bit currentmonitoringADC,DAC-programmablecurrentlimit, 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 avail- able in a 38-lead 5mm × 7mm QFN package. n Compliant with IEEE 802.3at Type 1 and 2 n Low Power Dissipation n 0.25Ω Sense Resistance Per Channel n Very High Reliability 4-Point PD Detection n 2-Point Forced Voltage n 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 n LTC4274A-1: LTPoE++ ™ 38.7W n LTC4274A-2: LTPoE++ 52.7W n LTC4274A-3: LTPoE++ 70W n LTC4274A-4: LTPoE++ 90W n LTC4274C: PoE 13W n Available in 38-Lead 5mm × 7mm QFN Package TYPICAL APPLICATION Complete Single-Port Ethernet High Power Source L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTPoE++ are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 4274AC TA01 VDD DGND AGND VEE SENSE –54V 1µF 100V SMAJ58A GATE OUT PORT 0.22µF 100V S1B S1B –54V AD0 AD1 AD2 AD3 SCL SDAIN SDAOUT INT AUTO MSD RESET MID 0.1µF LTC4274AC SHDN SMAJ5.0A 10Ω 10Ω 3.3V + 10µF + CBULK TVSBULK |
Similar Part No. - LTC4274A_15 |
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Similar Description - LTC4274A_15 |
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