LT4275 ++ + LTPoE /PoE /PoE PD Controller Fea T Descrip T n ++ IEEE 802.3af/at and LTPoE Powered Device The LT 4275 is a pin-for-pin compatible family of IEEE ++ (PD) Controller 802.3 and LTPoE powered device (PD) controllers. n ++ LTPoE Supports Power Levels Up to 90W ++ The LT4275A employs a proprietary LTPoE classification n LT4275A Supports All of the Following Standards: scheme, delivering 38.7W, 52.7W, 70W or 90W of power n ++ LTPoE 38.7W, 52.7W, 70W and 90W at the PD RJ45 connector. The LT4275A is fully compat- n IEEE 802.3at 25.5W Compliant ible with IEEE 802.3. The LT4275B is an IEEE 802.3at n IEEE 802.3af Up to 13W Compliant + compliant, Type 2 (PoE ) PD delivering up to 25.5W. The n LT4275B is IEEE 802.3at/af Compliant LT4275C is an IEEE 802.3af compliant, Type 1 (PoE) PD n LT4275C is IEEE 802.3af Compliant delivering up to 13W. n 100V Absolute Maximum Input Voltage The LT4275 internal charge pump provides an N-channel n Wide Junction Temperature Range (40C to 125C) MOSFET solution, eliminating a larger and more costly n Overtemperature Protection P-channel MOSFET. A low R MOSFET also maxi- n DS(ON) Integrated Signature Resistor mizes power delivery and efficiency, reduces power and n External Hot Swap N-Channel MOSFET for Lowest heat dissipation, and eases thermal design. Startup inrush Power Dissipation and Highest System Efficiency current is adjustable with an external capacitor. The LT4275 n Programmable Aux Power Support as Low as 9V also includes a power good output, on-board signature n Optional Support of Non-Standard Low Voltage PoE resistor, undervoltage lockout, and thermal protection. The n Available in 10-Lead MSOP and 3mm 3mm DFN LT4275A/LT4275B drives a single opto-coupler to indicate Packages the power level of the attached PSE. Pin-selectable sup- port for non-standard low voltage operation is provided. a T Auxiliary power override is supported with the AUX pin. n High Power Wireless Data Systems The LT4275A can be configured to support all possible n Outdoor Security Camera Equipment ++ LTPoE , 802.3at and 802.3af power levels with external n Commercial and Public Information Displays component changes. n High Temperature Industrial Applications L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ++ LTPoE and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T ++ LTPoE 90W Powered Device Interface V (9V TO 60V) AUX LT4275 Family + C PORT LT4275 GRADE FDMC86102 MAX DELIVERED ~ + DATA C POWER A B C PD V PORT PAIR 0.1F 3.3k ++ ~ LTPoE 90W l V 47nF IN ++ LTPoE 70W l ~ + ISOLATED + SPARE POWER ++ l PAIR VPORT HSGATE HSSRC LTPoE 52.7W V SUPPLY OUT ~ AUX PWRGD RUN ++ LTPoE 38.7W l LT4275A l l 25.5W RCLASS ++ RCLASS PSE TYPE T2P OPTO 13W l l l (TO P) GND IEEEUVLO R R CLS CLS++ 4275 TA01a 4275f 1 ion pplica ions pplica ion uresLT4275 a T e Maxi Mu M r a T (Notes 1, 3) VPORT, HSSRC Voltages ......................... 0.3V to 100V Operating Junction Temperature Range (Note 4) HSGATE Current.................................................. 20mA LT4275AI/LT4275BI/LT4275CI ..............40C to 85C IEEEUVLO, RCLASS, LT4275AH/LT4275BH/LT4275CH ....... 40C to 125C ++ RCLASS Voltages ....... 0.3V to 8V (and VPORT) Storage Temperature Range .................. 65C to 150C AUX Current ........................................................ 1.4mA Lead Temperature (Soldering, 10 sec.) ..................300C T2P, PWRGD Voltage ............................... 0.3V to 100V T2P, PWRGD Current ...............................................5mA p c F T TOP VIEW TOP VIEW IEEEUVLO 1 10 VPORT IEEEUVLO 1 10 VPORT AUX 2 9 HSGATE AUX 2 9 HSGATE 11 RCLASS 3 8 HSSRC RCLASS 3 8 HSSRC GND ++ ++ RCLASS /NC* 4 7 PWRGD RCLASS /NC* 4 7 PWRGD GND 5 6 T2P/NC* GND 5 6 T2P/NC* MS PACKAGE 10-LEAD PLASTIC MSOP DD PACKAGE 10-LEAD (3mm 3mm) PLASTIC DFN T = 150C, = 45C/W JMAX JC T = 150C, = 5C/W JMAX JC EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB GND ++ * RCLASS is not connected in the LT4275B/C versions. T2P is not connected in the LT4275C version. o r D i n F Ma T MAX PD LEAD FREE FINISH TAPE AND REEL PART MARKING* POWER PACKAGE DESCRIPTION TEMPERATURE RANGE LT4275AIDD PBF LT4275AIDD TRPBF LGBS 90W 10-Lead (3mm 3mm) Plastic DFN 40C to 85C LT4275AHDD PBF LT4275AHDD TRPBF LGBS 90W 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LT4275AIMS PBF LT4275AIMS TRPBF LTGBT 90W 10-Lead Plastic MSOP 40C to 85C LT4275AHMS PBF LT4275AHMS TRPBF LTGBT 90W 10-Lead Plastic MSOP 40C to 125C LT4275BIDD PBF LT4275BIDD TRPBF LGBV 25.5W 40C to 85C 10-Lead (3mm 3mm) Plastic DFN LT4275BHDD PBF LT4275BHDD TRPBF LGBV 25.5W 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LT4275BIMS PBF LT4275BIMS TRPBF LTGBW 25.5W 10-Lead Plastic MSOP 40C to 85C LT4275BHMS PBF LT4275BHMS TRPBF LTGBW 25.5W 10-Lead Plastic MSOP 40C to 125C LT4275CIDD PBF LT4275CIDD TRPBF LGBX 13W 10-Lead (3mm 3mm) Plastic DFN 40C to 85C LT4275CHDD PBF LT4275CHDD TRPBF LGBX 13W 40C to 125C 10-Lead (3mm 3mm) Plastic DFN LT4275CIMS PBF LT4275CIMS TRPBF LTGBY 13W 10-Lead Plastic MSOP 40C to 85C LT4275CHMS PBF LT4275CHMS TRPBF LTGBY 13W 10-Lead Plastic MSOP 40C to 125C 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 nonstandard lead based finish parts. For more information on lead free part marking, go to: