LTC4259A-1 Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect FEATURES DESCRIPTIO TM Controls Four Independent 48V Powered The LTC 4259A-1 is a quad 48V Hot Swap controller Ethernet Ports designed for use in IEEE 802.3af compliant Power Sourc- Each LTC4259A-1 Port Includes: ing Equipment (PSE). It consists of four independent ports, IEEE 802 .3af Compliant PD Detection and each with output current limit, short-circuit protection, com- Classification plete Powered Device (PD) detection and classification ca- Output Current Limit with Foldback pability, and programmable PD disconnect using AC or DC Short-Circuit Protection with Fast Gate Pull-Down sensing. Used with power MOSFETs and passives as in PD Disconnect Using AC or DC Sensing Figure 1, the LTC4259A-1 can implement a complete IEEE Improved AC Disconnect 802.3af-compliant PSE. Improved UVLO TM 2 The LTC4259A-1 can operate autonomously or be controlled Operates Autonomously or Controlled by I C 2 by an I C serial interface. Up to 16 LTC4259A-1s may co- Serial Interface exist on the same data bus, allowing up to 64 powered 4-Bit Programmable Digital Address Allows Control Ethernet ports to be controlled with only two digital lines. Fault of Up to 64 Ports Current and Duty Cycle Limits Protect External FETs conditions are optionally signaled with a programmable INT IMPROVED UVLO pin to eliminate software polling. Available in a 36-pin SSOP package. External power MOSFETs, current sense resistors and di- odes allow easy scaling of current and power dissipation U APPLICATIO S levels and provide protection against voltage and current spikes and ESD events. IEEE 802.3af Compliant Endpoint and Midspan Linear Technology also provides solutions for 802.3af PD Power Sources applications with the LTC4257, LTC4257-1 and LTC4267. IP Phone Systems DTE Power Distribution , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO 3.3V 0.1F 0.1F 100V X7R INT SHDN1 SHDN2 SHDN3 SHDN4 V OSCIN AUTO BYP RESET SCL DD SDAIN DETECT1 SDAOUT DETECT2 AD0 DETECT3 LTC4259A-1 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 4259a1fa 1 U ULTC4259A-1 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-1 4 33 GATE1 DGND to AGND (Note 2) .................................... 1V SCL SDAOUT 5 32 SENSE1 LTC4259AIGW-1 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-1 .......................................... 0C to 70C T = 150C, = 80C/W JMAX JA LTC4259AI-1 ........................................ 40C 85C Order Options Tape and Reel: Add TR Junction Temperature (Note 5)............................ 150C Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Storage Temperature Range ................ 65C to 150C Lead Free Part Marking: