LTC4259A Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect FEATURES DESCRIPTIO TM Controls Four Independent 48V Powered The LTC 4259A is a quad 48V Hot Swap controller Ethernet Ports designed for use in IEEE 802.3af compliant Power Each Port Includes: Sourcing Equipment (PSE). It consists of four independent IEEE 802 .3af Compliant PD Detection and ports, each with output current limit, short-circuit protec- Classification tion, complete Powered Device (PD) detection and classi- Output Current Limit with Foldback fication capability, and programmable PD disconnect using Short-Circuit Protection with Fast Gate Pull-Down AC or DC sensing. Used with power MOSFETs and passives PD Disconnect Using AC or DC Sensing as in Figure 1, the LTC4259A can implement a complete IEEE Power Good Indication 802.3af-compliant PSE. TM 2 Operates Autonomously or Controlled by I C The LTC4259A can operate autonomously or be controlled Serial Interface 2 by an I C serial interface. Up to 16 LTC4259As may coexist 4-Bit Programmable Digital Address Allows Control on the same data bus, allowing up to 64 powered Ethernet of Up to 64 Ports ports to be controlled with only two digital lines. Fault con- Programmable INT Pin Eliminates Software Polling Current and Duty Cycle Limits Protect External FETs ditions are optionally signaled with the INT pin to eliminate Available in a 36-Pin SSOP Package software polling. U External power MOSFETs, current sense resistors and di- APPLICATIO S odes allow easy scaling of current and power dissipation IEEE 802.3af Compliant Endpoint and Midspan levels and provide protection against voltage and current Power Sources spikes and ESD events. IP Phone Systems The LTC4259A is available in a 36-pin SSOP package. DTE Power Distribution , LTC and LT are registered trademarks of Linear Technology Corporation. HotSwap is Linear Technology also provides solutions for 802.3af PD a trademark of Linear Technology Corporation. All other trademarks are the property of applications with the LTC4257, LTC4257-1 and LTC4267. their respective owners. TYPICAL APPLICATIO 0.1F 3.3V 0.1F 100V X7R SCL INT SHDN1 SHDN2 SHDN3 SHDN4 V OSCIN AUTO BYP RESET DD SDAIN DETECT1 SDAOUT DETECT2 AD0 LTC4259A DETECT3 0.1F 100V SMAJ58A CMPD3003 AD1 4 4 4 AD2 DETECT4 AD3 1k 4 DGND AGND V SENSE1 GATE1 OUT1 SENSE2 GATE2 OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4 EE 0.47F 100V 4 10k 10k 10k 10k R S1 X7R 48V PORT1 Q1 R S2 0.1F PORT2 Q2 R S3 PORT3 Q3 R S4 PORT4 4259A F01 Q4 RS1 TO RS4: 0.5 S1B 4 Q1 TO Q4: IRFM120A Figure 1. Complete 4-Port Powered Ethernet Power Source 4259afb 1 U ULTC4259A UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW Supply Voltages ORDER PART RESET 1 36 OSCIN V to DGND .......................................... 0.3V to 5V NUMBER DD 2 AUTO BYP 35 V to AGND ......................................... 0.3V to 70V EE INT 3 34 OUT1 LTC4259ACGW 4 33 GATE1 DGND to AGND (Note 2) .................................... 1V SCL SDAOUT 5 32 SENSE1 Digital Pins SDAIN 6 31 OUT2 SCL, SDAIN, SDAOUT, INT, AUTO, RESET 7 GATE2 AD3 30 AD2 8 29 SENSE2 SHDNn, ADn ................. DGND 0.3V to DGND + 5V 9 28 V AD1 EE Analog Pins AD0 10 27 OUT3 GATEn (Note 3) ................... V 0.3V to V + 12V DETECT1 11 26 GATE3 EE EE 12 SENSE3 DETECT2 25 DETECTn Peak Currents (Note 4) .................. 80mA DETECT3 13 24 OUT4 SENSEn ................................. V 0.3V to V + 1V EE EE 14 23 GATE4 DETECT4 OUTn .................................... V 70V to V + 70V DGND 15 22 SENSE4 EE EE V 16 21 AGND OSCIN .......................... DGND 0.3V to DGND + 5V DD 17 SHDN4 SHDN1 20 BYP Current .................................................... 1mA SHDN2 18 19 SHDN3 Operating Ambient Temperature Range GW PACKAGE 36-LEAD PLASTIC SSOP LTC4259AC ............................................. 0C to 70C T = 150C, = 80C/W JMAX JA Junction Temperature (Note 5)............................ 150C Order Options Tape and Reel: Add TR Storage Temperature Range ................ 65C to 150C Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Temperature (Soldering, 10 sec)................. 300C Lead Free Part Marking: