LTC4269-1 IEEE 802.3at PD with Synchronous No-Opto Flyback Controller FEATURES DESCRIPTION n 25.5W IEEE 802.3at Compliant (Type 2) PD The LTC 4269-1 is an integrated Powered Device (PD) n Integrated State-of-the-Art Synchronous Flyback controller and switching regulator intended for high Controller power IEEE 802.3at and 802.3af applications. The LTC4269-1 is targeted for high ef ciency, single and Isolated Power Supply Ef ciency >92% multioutput applications from 10W to 25W. By support- 88% Ef ciency Including Diode Bridge and ing both 1-event and 2-event classi cations, as de ned Hot Swap FET n by the IEEE, the LTC4269-1 can be used in a wide range Flexible Integrated Auxiliary Power Support n of product con gurations. Superior EMI Performance n Robust 100V 0.7 (Typ) Integrated Hot Swap MOSFET The LTC4269-1 synchronous, current mode, yback con- n IEEE 802.3at High Power Available Indicator troller generates multiple supply rails in a single conversion n Integrated Signature Resistor and Programmable step providing for the highest system ef ciency while main- Class Current taining tight regulation across all outputs. The LTC4269-1 n Undervoltage, Overvoltage and Thermal Protection includes Linear Technologys patented No-Opto feedback n Short-Circuit Protection with Auto-Restart topology to provide full IEEE 802.3 isolation without the n Programmable Soft-Start and Switching Frequency need of an opto-isolator circuit. A true soft-start function n Complementary Power Good Indicators allows graceful ramp-up of all output voltages. n Thermally Enhanced 7mm 4mm DFN Package All Linear Technology PD solutions include a shutdown pin to provide exible auxiliary power options. The APPLICATIONS LTC4269-1 can accommodate adaptor voltages from 18V n VoIP Phones with Advanced Display Options to 60V and supports both PoE or aux dominance options. n Dual-Radio Wireless Access Points The LTC4269-1 is available in a space saving 32-pin DFN n PTZ Security Cameras package. n RFID Readers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other n Industrial Controls trademarks are the property of their respective owners. Protected by U.S. Patents, including 5841643. TYPICAL APPLICATION 25W High Ef ciency PD Solution 0.18H 5V 5A 10H V IN 47F + + 100F 2.2F 39k 10F 383k 27.4k 10F ~ + 54V FROM TO MICRO DATA PAIR 14k 3.01k CONTROLLER ~ + PWRGD UVLO T2P FB V PG SENSE CC ~ + 54V FROM V PORTP 33m SPARE PAIR ~ R CLASS SENSE 30.9 LTC4269-1 0.1F SHDN SG 2.2nF V V PORTN CMP 1F V SYNC GND OSC PGDLY t ENDLY R C NEG ON CMP CMP 10nF 12k 100k 38.3k 1.21k 33pF 0.1F 42691 TA01a 42691fc 1LTC4269-1 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW Pins with Respect to V PORTN SHDN 1 32 V PORTP V Voltage ......................................... 0.3V to 100V PORTP T2P 2 31 NC V Voltage ......................................... 0.3V to V NEG PORTP R 3 30 PWRGD CLASS V Pull-Up Current ..................................................1A NEG NC 4 29 PWRGD SHDN ....................................................... 0.3V to 100V V 5 28 NC PORTN R , Voltage ............................................ 0.3V to 7V CLASS V 6 27 V PORTN NEG R Source Current ...........................................50mA CLASS NC 7 26 V NEG PWRGD Voltage (Note 3) NC 8 33 25 NC Low Impedance Source ......V 0.3V to V +11V NEG NEG SG 9 24 PG Sink Current .........................................................5mA V 10 23 PGDLY CC PWRGD, T2P Voltage ............................... 0.3V to 100V t 11 22 R ON CMP PWRGD, T2P Sink Current .....................................10mA ENDLY 12 21 C CMP + SYNC 13 20 SENSE Pins with Respect to GND SFST 14 19 SENSE V (Note 3) CC OSC 15 18 UVLO Low Impedance Source ....................... 0.3V to +18V FB 16 17 V CMP Sink Current .......................................................30mA + SENSE , SENSE Voltage ........................ 0.5V to +0.5V DKD32 PACKAGE 32-LEAD (7mm 4mm) PLASTIC DFN UVLO, SYNC Voltage ...................................0.3V to V CC T = 125C, = 34C/W, = 2C/W JMAX JA JC FB Current ..............................................................2mA GND, EXPOSED PAD (PIN 33) MUST BE SOLDERED TO A HEAT SINKING PLANE THAT IS CONNECTED TO V V Current .........................................................1mA NEG CMP Operating Ambient Temperature Range LTC4269C-1 ................................................. 0C to 70C LTC4269I-1 ..............................................40C to 85C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4269CDKD-1 PBF LTC4269CDKD-1 TRPBF 42691 32-Lead (7mm 4mm) Plastic DFN 0C to 70C LTC4269IDKD-1 PBF LTC4269IDKD-1 TRPBF 42691 32-Lead (7mm 4mm) Plastic DFN 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. 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