LTC4266 Quad IEEE 802.3at Power over Ethernet Controller Fe A Description n Four Independent PSE Channels The LTC 4266 is a quad PSE controller designed for use n Compliant with IEEE 802.3at Type 1 and 2 in IEEE 802.3 Type 1 and Type 2 (high power) compliant n 0.34 Total Channel Resistance Power over Ethernet systems. External power MOSFETs n 130mW/Port at 600mA enhance system reliability and minimize channel resis- n Advanced Power Management tance, cutting power dissipation and eliminating the need n 8-Bit Programmable Current Limit (I ) for heatsinks even at Type 2 power levels. External power LIM n 7-Bit Programmable Overload Currents (I ) components also allow use at very high power levels while CUT n Fast Shutdown of Preselected Ports remaining otherwise compatible with the IEEE standard. n 14.5-Bit Port Current/Voltage Monitoring 80V-rated port pins provide robust protection against n 2-Event Classification external faults. n Very High Reliability 4-Point PD Detection The LTC4266 includes advanced power management n 2-Point Forced Voltage features, including current and voltage readback and n 2-Point Forced Current programmable I and I thresholds. Available C CUT LIM n High Capacitance Legacy Device Detection libraries simplify power-management software develop- n LTC4259A-1 and LTC4258 Pin and SW Compatible ment an optional AUTO pin mode provides fully IEEE- 2 n 1MHz I C Compatible Serial Control Interface compliant standalone operation with no software required. n Midspan Backoff Timer Proprietary 4-point PD detection circuitry minimizes false n Supports Proprietary Power Levels Above 25W PD detection while supporting legacy phone operation. n Available in 38-Pin 5mm 7mm QFN and 36-Pin Midspan operation is supported with built-in 2-event clas- SSOP Packages sification and backoff timing. Host communication is via 2 a 1MHz I C serial interface. Applic A The LTC4266 is available in a 5mm 7mm QFN pack- n High Power PSE Switches/Routers age that significantly reduces board space compared with n High Power PSE Midspans competing solutions. A legacy-compatible 36-pin SSOP L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and package is also available. ThinSOT is a trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners. t Al Applic A Complete 4-Port Ethernet High Power Source 10 AD0 AD1 AD2 AD3 SHDN1 SHDN2 SHDN3 SHDN4 AUTO MSD RESET MID SDAIN SCL 3.3V V DD 0.1F SDAOUT SMAJ5.0A + INT DGND 10F LTC4266 0.22F 100V S1B S1B 10 4 4 4 AGND 54V V SENSE1 GATE1 OUT1 SENSE2 GATE2 OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4 EE + SMAJ58A C 1F BULK 100V TVS BULK PORT1 54V PORT2 PORT3 PORT4 4266 TA01 4266fg 1 For more information www.linear.com/LTC4266 tion ypic tions turesLTC4266 Absolute M A Mu M rA Supply Voltages (Note 1) Analog Pins AGND V ........................................... 0.3V to 80V GATEn, SENSEn, OUTn .......... V 0.3V to V + 80V EE EE EE DGND V ........................................... 0.3V to 80V Operating Temperature Range EE V DGND ......................................... 0.3V to 5.5V LTC4266C ................................................ 0C to 70C DD Digital Pins LTC4266I .............................................40C to 85C SCL, SDAIN, SDAOUT, INT, SHDNn, MSD, ADn, Junction Temperature (Note 2) ............................. 125C RESET, AUTO, MID ........... DGND 0.3V to V + 0.3V Storage Temperature Range .................. 65C to 150C DD Lead Temperature (Soldering, 10 sec) ...................300C p in c F A TOP VIEW TOP VIEW 1 36 MSD RESET MID 2 35 AUTO 3 34 OUT1 INT 38 37 36 35 34 33 32 SCL 4 33 GATE1 SDAOUT 1 31 GATE1 5 SENSE1 SDAOUT 32 NC 2 30 SENSE1 6 31 OUT2 SDAIN 3 29 OUT2 SDAIN AD3 GATE2 4 28 AD3 7 30 GATE2 AD2 5 27 SENSE2 8 29 SENSE2 AD2 AD1 6 26 V EE AD1 9 28 V EE 39 AD0 7 25 V EE 10 AD0 27 OUT3 DNC 8 24 OUT3 11 26 GATE3 NC NC 9 23 GATE3 NC 12 25 SENSE3 DGND 10 22 SENSE3 13 24 OUT4 NC NC 11 21 OUT4 NC 14 23 GATE4 NC 12 20 GATE4 DGND 15 22 SENSE4 13 14 15 16 17 18 19 16 21 AGND V DD SHDN1 17 20 SHDN4 18 SHDN3 SHDN2 19 UHF PACKAGE 38-LEAD (5mm 7mm) PLASTIC QFN GW36 PACKAGE EXPOSED PAD IS V (PIN 39) MUST BE SOLDERED TO PCB EE 36-LEAD PLASTIC WIDE SSOP T = 125C, = 34C/W JMAX JA T = 125C, = 80C/W JMAX JA