LTC4274 + Single PoE PSE Controller Fe A Description n Compliant with IEEE 802.3at Type 1 and 2 The LTC 4274 is a single power sourcing equipment con- n 0.34 Total Channel Resistance troller designed for use in IEEE 802.3 Type 1 and Type 2 n 130mW/Port at 600mA (high power) compliant Power over Ethernet systems. n Advanced Power Management External power MOSFETs enhance system reliability and n 8-Bit Programmable Current Limit (I ) minimize channel resistance, cutting power dissipation and LIM n 7-Bit Programmable Overload Currents (I ) eliminating the need for heatsinks even at Type 2 power CUT n Fast Shutdown levels. External power components also allow use at very n 14.5-Bit Port Current/Voltage Monitoring high power levels while remaining otherwise compatible n 2-Event Classification with the IEEE standard. 80V-rated port pins provide robust n Very High Reliability 4-Point PD Detection protection against external faults. n 2-Point Forced Voltage The LTC4274 includes advanced power management n 2-Point Forced Current features, including current and voltage readback and pro- n High Capacitance Legacy Device Detection grammable I and I thresholds. Available C libraries CUT LIM n LTC4259A-1 and LTC4266 SW Compatible simplify software development an optional AUTO pin mode 2 n 1MHz I C Compatible Serial Control Interface provides fully IEEE-compliant standalone operation with n Midspan Backoff Timer no software required. Proprietary 4-point PD detection n Supports Proprietary Power Levels Above 25W circuitry minimizes false PD detection while supporting n Available in 38-Pin 5mm 7mm QFN Package legacy phone operation. Midspan operation is supported with built-in 2-event classification and backoff timing. 2 Applic A Host communication is via a 1MHz I C serial interface. n PSE Switches/Routers The LTC4274 is available in a 5mm 7mm QFN package n PSE Midspans that significantly reduces board space compared with L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and competing solutions. ++ ThinSOT and LTPoE are trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. t Al Applic A Complete Ethernet High Power Source 10 AD0 AD1 AD2 AD3 SCL SDAIN SDAOUT INT 3.3V V DD 0.1F AUTO SMAJ5.0A + MSD DGND 10F LTC4274 RESET 10 AGND MID SHDN V SENSE GATE OUT EE + SMAJ58A C 1F BULK 100V 0.22F S1B 100V TVS BULK PORT 54V 4274 TA01 S1B 54V 4274ff 1 For more information www.linear.com/LTC4274 tion ypic tions turesLTC4274 Absolute M A Mu M rA Supply Voltages (Note 1) Operating Temperature Range AGND V ........................................... 0.3V to 80V LTC4274C ................................................ 0C to 70C EE DGND V ............................................... 0.3V to 80V LTC4274I ..............................................40C to 85C EE V DGND .............................................. 0.3V to 5.5V Junction Temperature (Note 2) ............................. 125C DD Digital Pins Storage Temperature Range .................. 65C to 150C SCL, SDAIN, SDAOUT, INT, SHDN, MSD, ADn, Lead Temperature (Soldering, 10 sec) ...................300C RESET, AUTO, MID ........... DGND 0.3V to V + 0.3V DD Analog Pins GATE, SENSE, OUT ................ V 0.3V to V + 80V EE EE p in c F A TOP VIEW 38 37 36 35 34 33 32 SDAOUT 1 31 GATE NC 2 30 SENSE SDAIN 3 29 NC AD3 NC 4 28 AD2 5 27 V EE AD1 6 V 26 V EE EE 39 AD0 7 25 V EE DNC 8 24 NC NC 23 NC 9 DGND 10 22 V EE NC 11 21 NC NC 12 20 NC 13 14 15 16 17 18 19 UHF PACKAGE 38-LEAD (5mm 7mm) PLASTIC QFN EXPOSED PAD IS V (PIN 39) MUST BE SOLDERED TO PCB EE T = 125C, = 34C/W JMAX JA o r Der i n F MA