LTC4264 High Power PD Interface Controller with 750mA Current Limit FEATURES DESCRIPTION Complete High Power PD Interface Controller The LTC 4264 is an integrated Powered Device (PD) in- IEEE 802.3af Compliant terface controller intended for IEEE 802.3af Power over Onboard 750mA Power MOSFET Ethernet (PoE) and high power PoE applications up to 35W. Complementary Power Good Outputs By including a precision dual current limit, the LTC4264 Flexible Auxiliary Power Options keeps inrush below the IEEE802.3af current limit levels Precision Dual Current Limit with Disable to ensure interoperability success while allowing for high Programmable Classi cation Current to 75mA power PD operation. The LTC4264 includes a eld-proven Onboard 25k Signature Resistor with Disable power MOSFET delivering up to 750mA to the PD load while Undervoltage Lockout maintaining compliance with the IEEE802.3af standard. Complete Thermal Overload Protection Complementary power good outputs allow the LTC4264 to Available in Low Pro le (4mm 3mm) DFN Package interface directly with a host of DC/DC converter products. The LTC4264 provides a complete signature and power APPLICATIONS interface solution for PD designs by incorporating the 25k signature resistor, classi cation circuitry, input current 802.11n Access Points limit, undervoltage lockout, thermal overload protection, High Power VoIP Video Phones signature disable and power good signaling. RFID Reader Systems PTZ Security Cameras and Surveillance Equipment The LTC4264 PD interface controller can be used along with a variety of Linear Technology DC/DC converter products to provide a complete, cost effective power solution for high power PD applications. The LTC4264 is available in the space-saving low pro le (4mm 3mm) DFN package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Turn On vs Time V C = 100F LOAD IN 50V/DIV ~ + LTC4264 54V FROM V 0.1F IN DF1501S + SHDN DATA PAIR GND V 5F SWITCHING OUT SMAJ58A ~ 50V/DIV MIN POWER R PWRGD CLASS SUPPLY + R PWRGD RUN CLASS PWRGD V ~ + OUT 3.3V RTN 54V FROM 50V/DIV I DF1501S TO LOGIC LIM EN SPARE PAIR V V ~ IN OUT 4264 TA01a I IN 200mA/DIV TIME (5ms/DIV) 4264 TA01b 4264f 1LTC4264 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Notes 1, 2) TOP VIEW V Voltage ................................................. 0.3V to 90V IN V Voltage ......... V + 90V (and GND) to V 0.3V SHDN 1 12 GND OUT IN IN SHDN Voltage ............................ V + 90V to V 0.3V NC 2 11 NC IN IN R , I Voltage ............... V + 7V to V 0.3V R 3 10 PWRGD CLASS CLASS LIM EN IN IN 13 I 4 9 PWRGD PWRGD Voltage (Note 3) LIM EN V 5 8 V Low Impedance Source ....V + 11V to V 0.3V IN OUT OUT OUT V 6 7 V Current Fed ..........................................................5mA IN OUT PWRGD Voltage ......................... V + 80V to V 0.3V IN IN DE12 PACKAGE 12-LEAD (4mm 3mm) PLASTIC DFN PWRGD Current .....................................................10mA T = 150C, = 43C/W, = 4.3C/W JMAX JA JC R Current .....................................................100mA CLASS EXPOSED PAD (PIN 13) MUST BE SOLDERED TO AN ELECTRICALLY ISOLATED HEAT SINK Operating Ambient Temperature Range LTC4264C ................................................ 0C to 70C ORDER PART NUMBER DE PART MARKING* LTC4264I ............................................. 40C to 85C LTC4264CDE 4264 Junction Temperature ........................................... 150C LTC4264IDE 4264 Storage Temperature Range ................... 65C to 150C Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: