LTC4269-1 - IEEE 802.3at PD with Synchronous No-Opto Flyback Controller

Features

  • 25.5W IEEE 802.3at Compliant (Type 2) PD
  • Integrated State-of-the-Art Synchronous Flyback
    Controller
    – Isolated Power Supply Efficiency >92%
    – 88% Efficiency Including Diode Bridge and
  • Hot Swap™ FET
  • Flexible Integrated Auxiliary Power Support
  • Superior EMI Performance
  • Robust 100V 0.7Ω (Typ) Integrated Hot Swap MOSFET
  • IEEE 802.3at High Power Available Indicator
  • Integrated Signature Resistor and Programmable Class Current
  • Undervoltage, Overvoltage and Thermal Protection
  • Short-Circuit Protection with Auto-Restart
  • Programmable Soft-Start and Switching Frequency
  • Complementary Power Good Indicators
  • Thermally Enhanced 7mm × 4mm DFN Package

Typical Application

LTC4269-1 Typical Application

Description

The LTC4269-1 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 supporting 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 controller generates multiple supply rails in a single conversion step providing for the highest system efficiency while maintaining 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

DFN-32

LTC4269-1 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC4269CDKD-1#PBF DFN 32 C $3.43 $2.40 View
LTC4269CDKD-1#TRPBF DFN 32 C $2.46 View
LTC4269CDKD-2#PBF DFN 32 C $3.71 $2.60 View
LTC4269CDKD-2#TRPBF DFN 32 C $2.65 View
LTC4269IDKD-1#PBF DFN 32 I $4.11 $2.88 View
LTC4269IDKD-1#TRPBF DFN 32 I $2.94 View
LTC4269IDKD-2#PBF DFN 32 I $4.46 $3.12 View
LTC4269IDKD-2#TRPBF DFN 32 I $3.18 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1335A-A LTC4269-1 | PoE Powered Device w/48V Isolated Auxiliary, Vout = 3.3V, Iout = 7A. $75.00
DC1335B-B LTC4269-1 | PoE Powered Device w/48V Isolated Auxiliary, Vout = 5V, Iout = 5A. $75.00
DC1335B-C LTC4269-1 | PoE Powered Device w/48V Isolated Auxiliary, Vout = 12V, Iout = 2A. $75.00
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Click here to view our complete list of demo boards

Applications

  • VoIP Phones with Advanced Display Options
  • Dual-Radio Wireless Access Points
  • PTZ Security Cameras
  • RFID Readers
  • Industrial Controls

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Design Tools

LTspiceIV

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

Models for the following parts are available in LTspice IV:
LTC4269-1
LTC4269-2

Technical Support