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LTC4263 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4263 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 42 page  LTC4278 1 4278fc • • • • 12mΩ 1µF 30.9 24k 1.8k 38.3k 100k 12k 0.1µF 33pF 0.1µF 2.2nF 1µF tON SYNC PGDLY UVLO PWRGD SENSE– VCMP SENSE+ RCMP VNEG RCLASS SHDN VPORTP VPORTN ENDLY OSC LTC4278 GND FB VCC SG PG CCMP TO MICRO CONTROLLER • 47µF 0.18µH 5V 4.5A 100µF + + 3.01k 21.5k T2P 46.4k 294k 10µF 10µF 8.2µH EPC3472G-LF FDMS2572 HAT2169 54V FROM DATA PAIR AUXILIARY SUPPLY (10V TO 57V) 54V FROM SPARE PAIR + – + – ~ ~ 4278 TA01a BSS63 PDS5100H B1100 + – ~ ~ TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support The LTC®4278 is an integrated Powered Device (PD) con- troller and switching regulator intended for high power IEEE 802.3at and 802.3af applications. With a wide input voltage range, the LTC4278 is specifically designed to sup- port PD applications that include a low-voltage auxiliary power input such as a 12V wall adaptor. The inclusion of a shutdown pin provides simple implementation of both PoE and auxiliary dominate applications. In addition, the LTC4278supportsboth1-eventand2-eventclassifications as defined by the IEEE, thereby allowing the use in a wide range of product configurations. TheLTC4278synchronous,currentmode,flybackcontrol- ler generates multiple supply rails in a single conversion stepprovidingforthehighestsystemefficiencywhilemain- taining tight regulation across all outputs. The LTC4278 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. The LTC4278 is available in a space saving 32-lead DFN package. n 25.5W IEEE 802.3at Compliant (Type 2) PD n 10V to 57V Auxiliary Power Input n Shutdown Pin for Flexible Auxiliary Power Support n Integrated State-of-the-Art No-Opto Synchronous Flyback Controller – Isolated Power Supply Efficiency >92% – 88% Efficiency Including Diode Bridge and Hot Swap™ FET 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 PD Solution with 12V Auxiliary L , LT, LTC, LTM, Linear Technology, SwitcherCAD and the Linear logo are registered trademarks and Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5841643. |
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