LTC4267-3 Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator Fea T Descrip T n Complete Power Interface Port for IEEE 802 .3af The LTC 4267-3 combines an IEEE 802.3af compliant Powered Device (PD) Powered Device (PD) interface with a 300kHz current mode n Onboard 100V, UVLO Switch switching regulator, providing a complete power solution n Constant-Frequency 300kHz Operation for PD applications. The LTC4267-3 integrates the 25k n Precision Dual Level Inrush Current Limit signature resistor, classification current source, thermal n Integrated Current Mode Switching Regulator overload protection, signature disable and power good n Onboard 25k Signature Resistor with Disable signal along with an undervoltage lockout optimized for n Programmable Classification Current (Class 0-4) use with the IEEE-required diode bridge. The LTC4267-3 n Thermal Overload Protection provides an increased operational current limit, maximizing n Power Good Signal power available for class 3 applications. n Integrated Error Amplifier and Voltage Reference The 300kHz current mode switching regulator provides n Low Profile 16-Pin SSOP or DFN Packages higher output power or smaller external size compared to its lower frequency counterparts. The LTC4267-3 is a T designed for driving a 6V rated N-channel MOSFET and features programmable slope compensation, soft-start, n IP Phone Power Management and constant-frequency operation, minimizing noise even n Wireless Access Points with light loads. The LTC4267-3 includes an onboard er- n Security Cameras ror amplifier and voltage reference allowing use in both n Power over Ethernet isolated and nonisolated configurations. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ++ LTPoE is a trademark of Linear Technology Corporation. All other trademarks are the property The LTC4267-3 is available in a space saving, low profile of their respective owners. 16-pin SSOP or DFN packages. Typical a T Class 2 PD with 3.3V Isolated Power Supply PA1133 SBM1040 3.3V 1.5A 10k + 48V FROM HD01 V P PORTP VCC + 320F P DATA PAIR 5F CHASSIS VCC + MIN MIN PWRGD 4.7F LTC4267-3 SMAJ58A NGATE Si3440 10k 0.1F SENSE P 0.1 VCC R I /RUN CLASS TH 470 + R 48V CLASS 6.8k HD01 68.1 FROM V FB 1% SPARE PAIR 100k 22nF SIGDISA PGND BAS516 V P PORTN OUT PS2911 60.4k TLV431 42671 TA01 42673fb 1 For more information www.linear.com/LTC4267-3 ion pplica ions pplica ion uresLTC4267-3 a Te Maxi Mu M r a T (Note 1) V with Respect to V Voltage .. 0.3V to 100V V , I /RUN to PGND Voltages ............... 0.3V to 3.5V PORTN PORTP FB TH P , SIGDISA, PWRGD SENSE to PGND Voltage .............................. 0.3V to 1V OUT Voltage .....................V + 100V to V 0.3V NGATE Peak Output Current (<10s) ...........................1A PORTN PORTN P to PGND Voltage (Note 2) Operating Ambient Temperature Range VCC Low Impedance Source ........................... 0.3V to 8V LTC4267C-3 ............................................. 0C to 70C LTC4267I-3 ..........................................40C to 85C Current Fed ..........................................5mA into P VCC Junction Temperature ........................................... 150C R Voltage ................V + 7V to V 0.3V CLASS PORTN PORTN Storage Temperature Range ..................65C to 150C PWRGD Current .....................................................10mA Lead Temperature (Soldering, 10 sec) ...................300C R Current ....................................................100mA CLASS NGATE to PGND Voltage ...........................0.3V to P VCC p in c F T TOP VIEW TOP VIEW I /RUN 1 16 V TH FB PGND 1 16 PGND PGND 2 15 PGND I /RUN 2 15 V TH FB NGATE 3 14 SENSE NGATE 3 14 SENSE P 4 13 V VCC PORTP 17 P 4 13 V VCC PORTP R 5 12 SIGDISA CLASS R 5 12 SIGDISA CLASS NC 6 11 PWRGD NC 6 11 PWRGD V 7 10 P PORTN OUT V 7 10 P PORTN OUT NC 8 9 NC 8 PGND 9 PGND DHC PACKAGE GN PACKAGE 16-LEAD (5mm 3mm) PLASTIC DFN 16-LEAD NARROW PLASTIC SSOP T = 150C, = 43.5C/W JMAX JA T = 150C, = 90C/W JMAX JA EXPOSED PAD (PIN 17) MUST BE SOLDERED TO PCB HEAT SINK. MAY BE ELECTRICALLY ISOLATED OR CONNECTED TO PGND. o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4267CDHC-3 PBF LTC4267CDHC-3 TRPBF 4267-3 16-Lead (5mm 3mm) Plastic DFN 0C to 70C LTC4267IDHC-3 PBF LTC4267IDHC-3 TRPBF 4267-3 16-Lead (5mm 3mm) Plastic DFN 40C to 85C LTC4267CGN-3 PBF LTC4267CGN-3 TRPBF 4267-3 16-Lead Narrow Plastic SSOP 0C to 70C LTC4267IGN-3 PBF LTC4267IGN-3 TRPBF 4267I-3 16-Lead Narrow Plastic SSOP 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4267CDHC-3 LTC4267CDHC-3 TR 4267-3 16-Lead (5mm 3mm) Plastic DFN 0C to 70C LTC4267IDHC-3 LTC4267IDHC-3 TR 4267-3 16-Lead (5mm 3mm) Plastic DFN 40C to 85C LTC4267CGN-3 LTC4267CGN-3 TR 4267-3 16-Lead Narrow Plastic SSOP 0C to 70C LTC4267IGN-3 LTC4267IGN-3 TR 4267-3 16-Lead Narrow Plastic SSOP 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. For more information on lead free part marking, go to: