LTC4267 Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator FEATURES DESCRIPTIO Complete Power Interface Port for IEEE 802 .3af The LTC 4267 combines an IEEE 802.3af compliant Pow- Powered Device (PD) ered Device (PD) interface with a current mode switching Onboard 100V, 400mA UVLO Switch regulator, providing a complete power solution for PD Precision Dual Level Inrush Current Limit applications. The LTC4267 integrates the 25k signature Integrated Current Mode Switching Regulator resistor, classi cation current source, thermal overload pro- Onboard 25k Signature Resistor with Disable tection, signature disable and power good signal along with Programmable Classi cation Current (Class 0-4) an undervoltage lockout optimized for use with the IEEE- Thermal Overload Protection required diode bridge. The precision dual level input current Power Good Signal limit allows the LTC4267 to charge large load capacitors Integrated Error Ampli er and Voltage Reference and interface with legacy PoE systems. Low Pro le 16-Pin SSOP and 3mm 5mm DFN The current mode switching regulator is designed for Packages driving a 6V rated N-channel MOSFET and features pro- U grammable slope compensation, soft-start, and constant APPLICATIO S frequency operation, minimizing noise even with light loads. The LTC4267 includes an onboard error ampli er IP Phone Power Management and voltage reference allowing use in both isolated and Wireless Access Points nonisolated con gurations. Security Cameras Power over Ethernet The LTC4267 is available in space saving, low pro le 16-pin SSOP or DFN packages. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO 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 CHASSIS DATA PAIR VCC 5F + MIN MIN PWRGD 4.7F LTC4267 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 SIGDISA PGND 22nF BAS516 V P PORTN OUT PS2911 60.4k TLV431 4267 TA01 4267fc 1 U ULTC4267 ABSOLUTE AXI U RATI GS (Note 1) V with Respect to V Voltage ...0.3V to 100V SENSE to PGND Voltage ..............................0.3V to 1V PORTN PORTP P , SIGDISA, PWRGD NGATE Peak Output Current (<10s) ..........................1A OUT Voltage ..................... V + 100V to V 0.3V Operating Ambient Temperature Range PORTN PORTN P to PGND Voltage (Note 2) LTC4267C ................................................ 0C to 70C VCC Low Impedance Source ...........................0.3V to 8V LTC4267I .............................................40C to 85C Current Fed .......................................... 5mA into P Junction Temperature VCC R Voltage .................V + 7V to V 0.3V GN Package ......................................................150C CLASS PORTN PORTN PWRGD Current .....................................................10mA DHC Package ....................................................125C R Current .....................................................100mA Storage Temperature Range ...................65C to 150C CLASS NGATE to PGND Voltage ...........................0.3V to P Lead Temperature (Soldering, 10 sec) .................. 300C VCC V , I /RUN to PGND Voltages ................0.3V to 3.5V FB TH UUW PACKAGE/ORDER I FOR ATIO TOP VIEW ORDER PART ORDER PART TOP VIEW 1 16 I /RUN V NUMBER NUMBER TH FB PGND 1 16 PGND 2 15 PGND PGND I /RUN 2 15 V TH FB 3 14 NGATE SENSE LTC4267CDHC NGATE 3 14 SENSE LTC4267CGN 4 13 P V VCC PORTP P 4 13 V LTC4267IDHC VCC LTC4267IGN 17 PORTP 5 12 R SIGDISA CLASS 5 R 12 SIGDISA CLASS 6 11 NC PWRGD 6 NC 11 PWRGD DFN PART* GN PART 7 10 V P PORTN OUT 7 10 V P PORTN OUT MARKING MARKING 8 9 NC NC 8 9 PGND PGND DHC16 PACKAGE GN PACKAGE 4267 4267 16-LEAD (3mm 5mm) PLASTIC DFN 16-LEAD NARROW PLASTIC SSOP T = 125C, = 43.5C/W JMAX JA 4267 4267I T = 150C, = 90C/W JMAX JA EXPOSED PAD (PIN 17) MUST BE SOLDERED TO ELECTRICALLY ISOLATED PCB HEAT SINK Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: