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LTC4266 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4266 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC4270/LTC4271 1 42701f n PoE PSE Switches/Routers n PoE PSE Midspans APPLICATIONS TYPICAL APPLICATION FEATURES DESCRIPTION 12-Port PoE/PoE+/LTPoE++ PSE Controller The LTC®4270/LTC4271 chipset is a 12-Port Power Sourc- ing Equipment (PSE) controller designed for use in IEEE 802.3at Type 1 and Type 2 (high power) compliant Power over Ethernet (PoE) systems. Transformer-isolated com- munication protocol replaces expensive opto-couplers and complex isolated 3.3V supply resulting in significant BOM cost savings. The LTC4270/LTC4271 chipset delivers lowest-in-industry heat dissipation by utilizing low-RDS(ON) external MOSFETs and 0.25Ω sense resistors. Advanced power management features include per-port 12- bit current monitoring ADCs, DAC-programmable current limit, and versatile fast shut-down 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 excel- lent immunity from false PD detection. Midspan PSEs are supported with 2-event classification and a 2 second backoff timer. The LTC4270/LTC4271 includes an I2C serial interface operable up to 1MHz. The LTC4270/LTC4271 is available in multiple power grades allowing delivered PD power up to 90W. n 12 Independent PSE Channels n Compliant with IEEE 802.3at Type 1 and 2 n Chipset Provides Electrical Isolation Reduced BOM Cost Eliminates up to 6 High Speed Opto-Couplers Eliminates Isolated 3.3V Power Supply 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 Temperature Monitoring n VEE and VPORT Monitoring n 1 Second Rolling IPORT Averaging n Supports 2-Pair and 4-Pair Output Power n 1MHz I2C Compatible Serial Control Interface n Available In Three Power Grades A-Grade – LTPoE++™ 35W to 90W B-Grade – PoE+ 25.5W C-Grade – PoE 13W n Available In 52-Lead 7mm × 8mm (LTC4270) and 24-Lead 4mm × 4mm (LTC4271) QFN Packages LTC4270/LTC4271 FAMILY LTC4270 GRADE ISOLATION LTPoE++ PoE+ PoE MAX DELIVERED POWER A Transformer ll l 90W B Transformer ll 25.5W C Transformer l 13W 3.3V 3.3V 0.1μF –54V 100Ω 100Ω 100Ω 100Ω 3.3V 1μF 1μF 0.1μF –54V 100Ω 100Ω 100Ω 100Ω GP0 GP1 MID RESET MSD INT AUTO SCL AD0 AD1 AD2 AD3 AD6 DGND CAP1 CAP2 DND DPD CND CPD DNA SENSE1 GATE1 OUT1 LTC4270 DPA CNA CPA XIO0 XIO1 0.22μF 100V 0.22μF 100V S1B S1B –54V –54V 42701 TA01a –54V S1B S1B PORTn PORT1 SDAIN SDAOUT LTC4271 NO ISOLATION REQUIRED ON I2C INTERFACE VDD33 2nF 2kV VEE SENSEn GATEn OUTn AGND VSSK 0.25Ω 0.25Ω –54V >47μF SYSTEM BULK CAP + L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and LTPoE++ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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