LTC4265 IEEE 802.3 at High Power PD Interface Controller with 2-Event Classification Recognition Fea T Descrip T n IEEE 802.3af/at Powered Device (PD) Controller The LTC 4265 is a 3rd generation Powered Device (PD) n IEEE 802.3at 2-event Classification Signaling Interface controller intended for IEEE 802.3at high power n Programmable Classification Current Power-over-Ethernet (PoE) applications up to 25.5W. By n Flexible Auxiliary Power Support Using SHDN Pin supporting 1-event and 2-event classification signaling as n Rugged 100V Onboard MOSFET with 100mA Inrush defined by IEEE 802.3, the LTC4265 can be used in a wide Current Limit. range of product configurations. A 100V MOSFET isolates n Complementary Power Good Outputs the DC/DC converter during detection and classification, n Onboard Signature Resistor and provides 100mA inrush current for a smooth power-up n Comprehensive Thermal Protection transition. The LTC4265 also includes complementary n Undervoltage and Overvoltage Lockout power good outputs, an on-board signature resistor, n 12-Lead, 4mm 3mm DFN Package undervoltage/overvoltage lockout and comprehensive thermal protection. All Linear Technology PD solutions include a shutdown pin with signature corrupt to provide a T flexible auxiliary power options. n 802.11n Access Points The LTC4265 PD interface controller can be used along n High Power VoIP Video Phones with a variety of DC/DC converter products to provide a n RFID Reader Systems complete, cost effective power solution for high power n PTZ Security Cameras and Surveillance Equipment PD applications. The LTC4265 is available in the space-saving low profile (4mm 3mm) DFN package and is drop-in compatible with the LTC4264. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T Turn-On vs Time GND V C = 100F LOAD IN 50V/DIV ~ + LTC4265 + 54V FROM V 0.1F + DATA PAIR GND 5F SWITCHING ~ MIN POWER GND V OUT PWRGD R CLASS SUPPLY 50V/DIV + R PWRGD RUN CLASS ~ + 3.3V RTN 54V FROM SHDN TO LOGIC PWRGD V OUT SPARE PAIR V V 50V/DIV ~ IN OUT T2PSE TO AUX TO LOGIC I PD 100mA/DIV 4265 TA01a TIME 25ms/DIV 4265 TA01b 4265fb 1 For more information www.linear.com/LTC4265 ion pplica ions pplica ion uresLTC4265 a Te Maxi Mu M r a T p in c F T (Notes 1, 2, 3) TOP VIEW GND Voltage ............................................ 0.3V to 100V SHDN 1 12 GND V Voltage ........................0.3V to 100V (and GND) OUT T2PSE 2 11 NC V Pull-Up Current ..................................................1A OUT R 3 10 PWRGD CLASS SHDN ....................................................... 0.3V to 100V 13 NC 4 9 PWRGD R , Voltage ............................................ 0.3V to 7V CLASS V 5 8 V IN OUT R Current .......................................................50mA CLASS V 6 7 V IN OUT PWRGD Voltage (Note 4) Low Impedance Source .....V 0.3V to V +11V DE PACKAGE OUT OUT 12-LEAD (4mm 3mm) PLASTIC DFN Pull-Up Current ....................................................5mA T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 13) TO BE TIED TO V AND SOLDERED TO PCB HEAT SINK PWRGD, T2PSE Voltage ........................... 0.3V to 100V IN PWRGD, T2PSE Pull-Down Current .......................10mA Junction Temperature ........................................... 125C Operating Ambient Temperature Range LTC4265C ................................................ 0C to 70C LTC4265I.............................................. 40C to 85C Der in F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4265CDE PBF LTC4265CDE TRPBF 4265 12-Lead (4mm 3mm) Plastic DFN 0C to 70C LTC4265IDE PBF LTC4265IDE TRPBF 4265 12-Lead (4mm 3mm) Plastic DFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: