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LTC4259ACGW Datasheet(PDF) 1 Page - Linear Technology |
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LTC4259ACGW Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC4259A 1 4259Af , LTC and LT are registered trademarks of Linear Technology Corporation. s Controls Four Independent – 48V Powered Ethernet Ports s Each Port Includes: – IEEE 802 ®.3af Compliant PD Detection and Classification – Output Current Limit with Foldback – Short-Circuit Protection with Fast Gate Pull-Down – PD Disconnect Using AC or DC Sensing – Power Good Indication s Operates Autonomously or Controlled by I2C TM Serial Interface s 4-Bit Programmable Digital Address Allows Control of Up to 64 Ports s Programmable INT Pin Eliminates Software Polling s Current and Duty Cycle Limits Protect External FETs s Available in a 36-Pin SSOP Package Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect s IEEE 802.3af Compliant Endpoint and Midspan Power Sources s IP Phone Systems s DTE Power Distribution The LTC ®4259A is a quad –48V Hot SwapTM controller designed for use in IEEE 802.3af compliant Power Sourcing Equipment (PSE). It consists of four independent ports, each with output current limit, short-circuit protec- tion, complete Powered Device (PD) detection and classi- fication capability, and programmable PD disconnect using AC or DC sensing. Used with power MOSFETs and passives as in Figure 1, the LTC4259A can implement a complete IEEE 802.3af-compliant PSE. The LTC4259A can operate autonomously or be controlled by an I2C serial interface. Up to 16 LTC4259As may coexist on the same data bus, allowing up to 64 powered Ethernet ports to be controlled with only two digital lines. Fault con- ditions are optionally signaled with the INT pin to eliminate software polling. External power MOSFETs, current sense resistors and di- odes allow easy scaling of current and power dissipation levels and provide protection against voltage and current spikes and ESD events. The LTC4259A is available in a 36-pin SSOP package. Linear Technology also provides solutions for 802.3af PD applications with the LTC4257 and LTC4257-1. Hot Swap is a trademark of Linear Technology Corporation. 802 is a registered trademark of Instutute of Electrical and Electronics Engineers, Inc. I2C is a trademark of Philips Electronics N.V. Figure 1. Complete 4-Port Powered Ethernet Power Source DGND AD3 RS1 TO RS4: 0.5 Ω Q1 TO Q4: IRFM120A AD2 AD1 AD0 SDAOUT SDAIN SCL DETECT4 DETECT3 DETECT1 DETECT2 AGND INT –48V VEE SHDN1 SENSE1 RS1 RS2 RS3 RS4 GATE1 Q1 Q2 Q3 Q4 S1B ×4 CMPD3003 ×4 10k 10k 10k 10k 1k ×4 0.47 µF 100V ×4 X7R PORT1 PORT2 PORT3 PORT4 4259A F01 SMAJ58A ×4 0.1 µF 100V ×4 OUT1 SENSE2 GATE2 LTC4259A OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4 SHDN2 SHDN3 SHDN4 VDD 3.3V 0.1 µF AUTO BYP OSCIN RESET 0.1 µF 100V X7R 0.1 µF FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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