LTC4267-1 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 4267-1 combines an IEEE 802.3af compliant Powered Device (PD) Powered Device (PD) interface with a current mode switch- n Onboard 100V, UVLO Switch ing regulator, providing a complete power solution for PD n Precision Dual Level Inrush Current Limit applications. The LTC4267-1 integrates the 25k signature n Integrated Current Mode Switching Regulator resistor, classification current source, thermal overload n Onboard 25k Signature Resistor with Disable protection, signature disable and power good signal along n Programmable Classification Current (Class 0-4) with an undervoltage lockout optimized for use with the n Thermal Overload Protection IEEE-required diode bridge. The LTC4267-1 provides an n Power Good Signal increased operational current limit, maximizing power n Integrated Error Amplifier and Voltage Reference available for class 3 applications. n Low Profile 16-Pin SSOP Package The current mode switching regulator is designed for driving a 6V rated N-channel MOSFET and features pro- grammable slope compensation, soft-start, and constant a T frequency operation, minimizing noise even with light n IP Phone Power Management loads. The LTC4267-1 includes an onboard error amplifier n Wireless Access Points and voltage reference allowing use in both isolated and n Security Cameras nonisolated configurations. n Power over Ethernet The LTC4267-1 is available in a space saving, low profile 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 16-pin SSOP package. of their respective owners. Typical a T Class 2 PD with 3.3V Isolated Power Supply PA1133 SBM1040 3.3V 1.5A 10k + 48V HD01 FROM V P PORTP VCC + 320F P DATA PAIR 5F CHASSIS VCC + MIN MIN PWRGD 4.7F LTC4267-1 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 42671 TA01 42671fa 1 For more information www.linear.com/4267-1 ion pplica ions pplica ion uresLTC4267-1 a Te Maxi Mu M r a T p c F T (Note 1) TOP VIEW V with Respect to V Voltage .. 0.3V to 100V PORTN PORTP PGND 1 16 PGND P , SIGDISA, PWRGD OUT I /RUN 2 15 V TH FB Voltage .....................V + 100V to V 0.3V PORTN PORTN NGATE 3 14 SENSE P to PGND Voltage (Note 2) VCC P 4 13 V VCC PORTP Low Impedance Source ........................... 0.3V to 8V 5 R 12 SIGDISA CLASS Current Fed ..........................................5mA into P VCC 6 11 NC PWRGD R Voltage ................V + 7V to V 0.3V CLASS PORTN PORTN 7 10 V P PORTN OUT PWRGD Current .....................................................10mA 8 9 PGND PGND R Current ....................................................100mA CLASS GN PACKAGE NGATE to PGND Voltage ...........................0.3V to P 16-LEAD NARROW PLASTIC SSOP VCC T = 150C, = 90C/W JMAX JA V , I /RUN to PGND Voltages ............... 0.3V to 3.5V FB TH SENSE to PGND Voltage .............................. 0.3V to 1V NGATE Peak Output Current (<10s) ...........................1A Operating Ambient Temperature Range LTC4267C-1 ............................................. 0C to 70C LTC4267I-1 ..........................................40C to 85C Junction Temperature ........................................... 150C Storage Temperature Range ..................65C to 150C Lead Temperature (Soldering, 10 sec) ...................300C o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4267CGN-1 PBF LTC4267CGN-1 TRPBF 4267-1 16-Lead Narrow Plastic SSOP 0C to 70C LTC4267IGN-1 PBF LTC4267IGN-1 TRPBF 4267I-1 16-Lead Narrow Plastic SSOP 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4267CGN-1 LTC4267CGN-1 TR 4267-1 16-Lead Narrow Plastic SSOP 0C to 70C LTC4267IGN-1 LTC4267IGN-1 TR 4267I-1 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: