LT4294 IEEE 802.3bt PD Interface Controller FEATURES DESCRIPTION n IEEE 802.3af/at/bt Powered Device (PD) Controller The LT 4294 is an IEEE 802.3af/at/bt-compliant powered n Supports Up to 71.3W PDs device (PD) interface controller. The T2P output indicates n 5-Event Classification Sensing the number of classification events received during IEEE n Superior Surge Protection (100V Absolute Maximum) 802.3bt-compliant mutual identification and negotiation n Wide Junction Temperature Range (40C to 125C) of available power. n Overtemperature Protection The LT4294 utilizes an external, low R N-channel DS(ON) n Integrated Signature Resistor hot swap MOSFET and supports the LT4320/LT4321 ideal n External Hot Swap N-Channel MOSFET for Lowest diode bridges, to extend the end-to-end power delivery Power Dissipation and Highest System Efficiency efficiency and eliminate costly heat sinks. The LT4294 n Configurable Aux Power Support as Low as 9V also includes a power good output, onboard signature n ++ Easy Migration Between LTPoE PDs and IEEE resistor, undervoltage lockout, and thermal protection. 802.3bt PDs Start-up inrush current is adjustable with an external n Pin Compatible with LT4275A/B/C capacitor. Auxiliary power override is supported as low n Available in 10-Lead MSOP and 3mm 3mm as 9V with the AUX pin. DFNPackages The LT4294 can be configured to support all possible 802.3bt, 802.3at and 802.3af power levels with external APPLICATIONS component changes. Pin-for-pin compatibility with the n High Power Wireless Data Systems LT4275 family of PD Interface Controllers enables easy n Outdoor Security Camera Equipment ++ migration between LTPoE PDs and IEEE 802.3bt- n Commercial and Public Information Displays compliant PDs. n High Temperature Industrial Applications All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION IEEE 802.3bt Single-Signature Powered Device Interface SINGLE-SIGNATURE POWER CLASSIFICATION (AT PD INPUT) V (9V TO 60V) AUX + CLASS POWER C PORT PSMN040-100MSE 0 13W ~ + DATA C PD V 1 3.84W PORT PAIR 0.1F 3.3k ~ 2 6.49W V 47nF IN 3 13W ~ + ISOLATED + SPARE POWER 4 25.5W PAIR VPORT HSGATE HSSRC V SUPPLY OUT ~ 5 40W AUX PWRGD RUN 6 51W LT4294 RCLASS 7 62W ++ RCLASS PSE TYPE OPTO T2P 8 71.3W (TO P) GND ++ R R CLS CLS 4294 TA01a Rev. B 1 Document Feedback For more information www.analog.comLT4294 ABSOLUTE MAXIMUM RATINGS (Notes 1, 3) VPORT, HSSRC Voltages ......................... 0.3V to 100V Operating Junction Temperature Range (Note 4) HSGATE Current.................................................. 20mA LT4294I ................................................40C to 85C ++ RCLASS, RCLASS LT4294H ............................................ 40C to 125C 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 PIN CONFIGURATION TOP VIEW TOP VIEW GND 1 10 VPORT GND 1 10 VPORT AUX 2 9 HSGATE AUX 2 9 HSGATE 11 RCLASS 3 8 HSSRC RCLASS 3 8 HSSRC GND ++ RCLASS 4 7 PWRGD ++ RCLASS 4 7 PWRGD GND 5 6 T2P GND 5 6 T2P MS PACKAGE 10-LEAD PLASTIC MSOP DD PACKAGE T = 150C, = 45C/W JMAX JC 10-LEAD (3mm 3mm) PLASTIC DFN T = 150C, = 5C/W JMAX JC EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB GND ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT4294IDD PBF LT4294IDD TRPBF LHBX 10-Lead (3mm 3mm) Plastic DFN 40C to 85C LT4294HDD PBF LT4294HDD TRPBF LHBX 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LT4294IMS PBF LT4294IMS TRPBF LTHBW 10-Lead Plastic MSOP 40C to 85C LT4294HMS PBF LT4294HMS TRPBF LTHBW 10-Lead Plastic MSOP 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. (Note 3) A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VPORT Operating Input Voltage At VPORT Pin l 60 V V VPORT Signature Range At VPORT Pin l 1.5 10 V SIG l V VPORT Classification Range At VPORT Pin 12.5 21 V CLASS V VPORT Mark Range At VPORT Pin, Preceded by V l 5.6 10 V MARK CLASS Rev. B 2 For more information www.analog.com