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LTC4290 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4290 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC4290/LTC4271 1 429071f n PoE PSE Switches/Routers n PoE PSE Midspans APPLICATIONS FEATURES DESCRIPTION 8-Port PoE/PoE+ PSE Controller The LTC®4290/LTC4271 chipset is an 8-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 LTC4290/LTC4271 chipset delivers lowest-in-industryheatdissipationbyutilizinglow-RDS(ON) external MOSFETs and 0.25Ω sense resistors. Advancedpowermanagementfeaturesincludeper-port12- 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 LTC4290/LTC4271 includes an I2C serial interface operable up to 1MHz. n Eight 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 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 a 40-Lead 6mm × 6mm (LTC4290) and 24-Lead 4mm × 4mm (LTC4271) QFN Package 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. TYPICAL APPLICATION • • 3.3V 3.3V 0.1µF –54V 100 100 100 100 • • 3.3V 1µF 1µF 0.1µF –54V 100 100 100 100 GP0 GP1 MID RESET MSD INT AUTO SCL AD0 AD1 AD2 AD3 AD6 DGND CAP1 CAP2 DND DPD CND CPD DNA SENSE1 GATE1 OUT1 LTC4290 DPA CNA CPA XIO0 XIO1 0.22µF 100V 0.22µF 100V S1B S1B –54V –54V 429071 TA01a –54V S1B S1B PORTn PORT1 SDAIN SDAOUT LTC4271 NO ISOLATION REQUIRED ON I2C INTERFACE VDD33 2nF 2kV VEE SENSEn GATEn OUTn AGND VSSK 0.25 0.25 –54V >47µF SYSTEM BULK CAP + |
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Similar Description - LTC4290 |
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