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LTC4269CDKD-1-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC4269CDKD-1-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 44 page LTC4269-1 1 42691fb • • • • 33mΩ 39k 10μF 30.9Ω 1.21k 38.3k 100k 12k 10nF 10μF 2.2μF 0.1μF 33pF 0.1μF 2.2nF 1μF tON SYNC PGDLY UVLO PWRGD SENSE– VCMP SENSE+ RCMP VNEG SHDN RCLASS VPORTP VPORTN ENDLY OSC LTC4269-1 GND FB VCC VIN SG PG CCMP 10μH TO MICRO CONTROLLER • 47μF 0.18μH 5V 5A 100μF + + 3.01k 27.4k T2P 14k 383k 54V FROM DATA PAIR 54V FROM SPARE PAIR + – ~ ~ + – ~ ~ 42691 TA01a TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION IEEE 802.3at PD with Synchronous No-Opto Flyback Controller The LTC®4269-1 is an integrated Powered Device (PD) controller and switching regulator intended for high power IEEE 802.3at and 802.3af applications. The LTC4269-1 is targeted for high efficiency, single and multioutput applications from 10W to 25W. By support- ing both 1-event and 2-event classifications, as defined by the IEEE, the LTC4269-1 can be used in a wide range of product configurations. The LTC4269-1 synchronous, current mode, flyback con- troller generates multiple supply rails in a single conversion step providing for the highest system efficiency while main- taining tight regulation across all outputs. The LTC4269-1 includes Linear Technology’s patented No-Opto feedback topology to provide full IEEE 802.3 isolation without the need of an opto-isolator circuit. A true soft-start function allows graceful ramp-up of all output voltages. All Linear Technology PD solutions include a shutdown pin to provide flexible auxiliary power options. The LTC4269-1 can accommodate adaptor voltages from 18V to 60V and supports both PoE or aux dominance options. The LTC4269-1 is available in a space saving 32-pin DFN package. 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 trademarks are the property of their respective owners. Protected by U.S. Patents, including 5841643. n 25.5W IEEE 802.3at Compliant (Type 2) PD n Integrated State-of-the-Art Synchronous Flyback Controller – Isolated Power Supply Efficiency >92% – 88% Efficiency Including Diode Bridge and Hot Swap™ FET n Flexible Integrated Auxiliary Power Support n Superior EMI Performance n Robust 100V 0.7Ω (Typ) Integrated Hot Swap MOSFET n IEEE 802.3at High Power Available Indicator n Integrated Signature Resistor and Programmable Class Current n Undervoltage, Overvoltage and Thermal Protection n Short-Circuit Protection with Auto-Restart n Programmable Soft-Start and Switching Frequency n Complementary Power Good Indicators n Thermally Enhanced 7mm × 4mm DFN Package n VoIP Phones with Advanced Display Options n Dual-Radio Wireless Access Points n PTZ Security Cameras n RFID Readers n Industrial Controls 25W High Efficiency PD Solution |
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