LTC4269-2 - IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support

Features

  • Click Here for LTC4269 Evaluation Kit
  • 25.5W IEEE 802.3at Compliant (Type-2) PD
  • PoE+ 2-Event Classification
  • IEEE 802.3at High Power Available Indicator
  • Integrated State-of-the-Art Synchronous Forward Controller
    – Isolated Power Supply Efficiency >94%
  • Flexible Auxiliary Power Interface
  • Superior EMI Performance
  • Robust 100V 0.7Ω (Typ) Integrated Hot Swap™ MOSFET
  • Integrated Signature Resistor, Programmable Class Current, UVLO, OVLO and Thermal Protection
  • Short-Circuit Protection with Auto-Restart
  • Programmable Switching Frequency from 100kHz to 500kHz
  • Thermally Enhanced 7mm × 4mm DFN Package

Typical Application

LTC4269-2
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Description

The LTC4269-2 is an integrated Powered Device (PD) interface and power supply controller featuring 2-event classification signaling, flexible auxiliary power options, and a power supply controller suitable for synchronously 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 lockout 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. Programmable frequency over 100kHz to 500kHz allows flexibility in efficiency vs size and low EMI.
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Packaging

DFN-32

LTC4269-2
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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.

Evaluation Kits

Part Number Description Price
DC1351A LTC4269-2 | PoE Powered Device w/48V Isolated Auxiliary, Vout = 5V, Iout = 5A $125.00
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Applications

  • IP Phones with Large Color Screens
  • Dual Radio 802.11n Access Points
  • PTZ Security Cameras
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Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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