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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC4271 датащи(PDF) 1 Page - Linear Technology |
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LTC4271 датащи(HTML) 1 Page - Linear Technology |
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1 / 30 page  LTC4274A/LTC4274C 1 4274acfc 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) 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 power- ing 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. 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 LTC4274A-1: LTPoE++™ 38.7W LTC4274A-2: LTPoE++ 52.7W LTC4274A-3: LTPoE++ 70W LTC4274A-4: LTPoE++ 90W 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 SCL SDAIN SDAOUT AD0 AD1 AD2 AD3 AGND VEE SENSE –54V 1μF 100V SMAJ58A GATE OUT PORT 0.22μF 100V S1B S1B –54V DGND VDD INT SHDN AUTO MSD RESET MID 0.1μF 3.3V LTC4274A/LTC4274C |
Аналогичный номер детали - LTC4271 |
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Аналогичное описание - LTC4271 |
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ссылки URL |
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