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LTC4269CDKD-2-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC4269CDKD-2-PBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 34 page  LTC4269-2 42692fb Typical applicaTion FeaTures applicaTions DescripTion IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support The LTC®4269-2 is an integrated Powered Device (PD) interface and power supply controller featuring 2-event classification signaling, flexible auxiliary power op- tions, and a power supply controller suitable for syn- chronously rectified forward supplies. These features make the LTC4269-2 ideally suited for an IEEE802.3at PD application. The PD controller features a 100V MOSFET that isolates the power supply during detection and classification, and provides 100mA inrush current limit. Also included are power good outputs, an undervoltage/overvoltage lock- out and thermal protection. The current mode forward controller allows for synchronous rectification, resulting in an extremely high efficiency, green product. Soft-start for controlled output voltage start-up and fault recovery is included.Programmablefrequencyover100kHzto500kHz allows flexibility in efficiency vs size and low EMI. n 25.5W IEEE 802.3at Compliant (Type-2) PD n PoE+ 2-Event Classification n IEEE 802.3at High Power Available Indicator n Integrated State-of-the-Art Synchronous Forward Controller – Isolated Power Supply Efficiency >94% n Flexible Auxiliary Power Interface n Superior EMI Performance n Robust 100V 0.7Ω (Typ) Integrated Hot Swap™ MOSFET n Integrated Signature Resistor, Programmable Class Current, UVLO, OVLO and Thermal Protection n Short-Circuit Protection with Auto-Restart n Programmable Switching Frequency from 100kHz to 500kHz n Thermally Enhanced 7mm × 4mm DFN Package n IP Phones with Large Color Screens n Dual Radio 802.11n Access Points n PTZ Security Cameras + T2P VNEG VPORTN SHDN RCLASS VPORTP PGND TO MICRO- CONTROLLER GND BLANK DELAY 82k 30.9 332k 158k 133 10k 5.1 158k 22.1k 33k 1.5k 50m 2k 1.2k TLV431 VCC 11.3k 3.65k 42692 TA01 22k 0.22µF 0.1µF ROSC VREF FB COMP ISENSE OC SS_MAXDC SD_VSEC VIN PWRGD SOUT LTC4269-2 0.1µF 10µF VCC 33k 237k 2.2µF + 10µF 10µH 1mH 6.8µH 10.0k OUT 4.7nF 0.1µF 54V FROM DATA PAIR 54V FROM SPARE PAIR + – ~ ~ + – ~ ~ 4.7nF • • • 10nF + 220µF 5V 5A PoE-Based Self-Driven Synchronous Forward Power Supply L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap, ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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