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LTC4292 Datasheet(PDF) 1 Page - Analog Devices |
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LTC4292 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 40 page  LTC4291-1/LTC4292 1 Rev 0 For more information www.analog.com Document Feedback n PoE PSE Switches/Routers n PoE PSE Midspans APPLICATIONS FEATURES DESCRIPTION 4-Port IEEE 802.3bt PoE PSE Controller The LTC®4291-1/LTC4292 chipset is a 4-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC4291-1/LTC4292 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC4291-1/LTC4292 chipset delivers lowest-in-indus- try heat dissipation by utilizing low RDS(ON) external MOSFETs and 0.15Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V sup- ply, resulting in significant BOM cost savings. Advanced power management features include per-port 14-bit current monitoring, programmable current limit, and versatile fast shutdown of preselected ports. Advanced power management host software is available under a no- cost license. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC4291-1/LTC4292 includes an I2C serial interface operable up to 1MHz. The LTC4291-1/LTC4292 is pin or I2C programmable to nego- tiate PD delivered power up to 71.3W. n Four PSE Ports n Two Power Channels per Port n Fully Compliant IEEE 802.3bt Type 3 and 4 PSE n Compliant Support for Type 1, 2, 3, and 4 PDs n Low Power Path Dissipation per Channel n 150mΩ Sense Resistance n 30mΩ or Lower MOSFET RDS(ON) n Chipset Provides Electrical Isolation n Eliminates Optos and Isolated 3.3V Supply n Very High Reliability Multipoint PD Detection n Connection Check Distinguishes Single- Signature and Dual-Signature PDs n Continuous, Dedicated Per-Port Power and Current Monitoring n Per-Port Power Policing n 1MHz I2C Compatible Serial Control Interface n Pin or I2C Programmable PD Power Up to 71.3W n Available in a 40-Lead 6mm × 6mm (LTC4292) and 24-Lead 4mm × 4mm (LTC4291-1) QFN Packages All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION VSSKn VSSKn VEE VEE 100 100 100 100 100 100 100 100 S1B 10 0.15 >47µF 0.22µF 100V S1B S1B 0.15 0.22µF 100V S1B 2nF 0.1µF 1µF 100V 0.22µF 1µF 3.3V VEE 3.3V CPA CNA DPA DNA VEE VSSKn SENSEnA GATEnA AGNDP LTC4292 1000BASE-T VEE OUTnA AGNDP SENSEnB GATEnB OUTnB AGNDP TX1 TX2 TX3 TX4 RJ45 1 2 6 4 3 5 7 8 PWRMD0 PWRMD1 VEE MSD SCL SDAIN AD0 DGND DPD CND VDD LTC4291-1 CPD DND GP0 GP1 ISOLATION AD1 AD2 AD3 SDAOUT 4PVALID RESET INT AUTO CAP1 3.3V (NO I2C ISOLATION REQUIRED) VEE AGNDP (1 OF 4 PORTS) CAP2 2kV VSSKn AGNDP 0.22F, 100V 0.15Ω 42911 TA01a |
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Similar Description - LTC4292 |
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