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LTC4268-1

Features: · Robust 35W PD Front End· IEEE 8X02.3af Compliant· Rugged 750mA Power MOSFET with Precision Dual Level Current Limit· High Performance Synchronous Flyback Controller· IEEE Isolation Obtained without an Optoisolator· Adjustable Frequency from 50kHz to 250kHz · Tight Multi-Output Regulati...

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SeekIC No. : 004402548 Detail

LTC4268-1: Features: · Robust 35W PD Front End· IEEE 8X02.3af Compliant· Rugged 750mA Power MOSFET with Precision Dual Level Current Limit· High Performance Synchronous Flyback Controller· IEEE Isolation Obtai...

LTC4268-1 Data Sheet

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Part Number:
LTC4268-1
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/12/25

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Product Details

Description



Features:

· Robust 35W PD Front End
· IEEE 8X02.3af Compliant
· Rugged 750mA Power MOSFET with Precision Dual Level Current Limit
· High Performance Synchronous Flyback Controller
· IEEE Isolation Obtained without an Optoisolator
· Adjustable Frequency from 50kHz to 250kHz
· Tight Multi-Output Regulation with Load Compensation
· Onboard 25k Signature Resistor
· Programmable Classifi cation Current to 75mA
· Complete Thermal and Over-Current Protection
· Available in Compact 32-Pin 7mm × 4mm DFN Package


Application

· VoIP Phones with Advanced Display Options
· Dual-Radio Wireless Access Points
· PTZ Security Cameras
· RFID Readers
· Industrial Controls
· Magnetic Card Readers
· High Power PoE Systems


Pinout

Connection Diagram


Specifications

VPORTN Voltage .......................................... 0.3V to 90V
VNEG Voltage ...................VPORTN + 90V to VPORTN 0.3V
VCC to GND Voltage (Note 3)
Low Impedance Source ......................... 0.3V to 18V
Current Fed ..........................................30mA into VCC
RCLASS, ILIM_EN Voltage ...VPORTN + 7V to VPORTN 0.3V
SHDN Voltage ................VPORTN + 90V to VPORTN 0.3V
PWRGD Voltage (Note 3)
Low Impedance Source ....VNEG + 11V to VNEG 0.3V
Current Fed ..........................................................5mA
PWRGD Voltage ........VPORTN + 80V to VPORTN 0.3V
PWRGD Current ..................................................10mA
RCLASS Current ................................................100mA
SENSE, SENSE+ Voltage ...................0.5V to +0.5V
UVLO, SYNC Voltage ................................0.3V to VCC
FB Current ..........................................................±2mA
VCMP Current ......................................................±1mA
Operating Ambient Temperature Range (Notes 4, 5)
LTC4268-1C .............................................     0 to 70
LTC4268-1I ..........................................    40 to 85
Junction Temperature (Note 5) ............................. 150
Storage Temperature Range ................... 65°C to 150


Description

The LTC4268-1 is an integrated Powered Device (PD) controller and switching regulator intended for IEEE 802.3af and high power PoE applications up to 35W. By including a precision dual current limit, the LTC4268-1 keeps inrush below IEEE 802.3af current limit levels to ensure interoperability success while enabling high power applications with a 750mA operational current limit.

The LTC4268-1 synchronous, current-mode, fl yback controller generates multiple supply rails in a single conversion providing for the highest system effi ciency while maintaining tight regulation across all outputs. The LTC4268-1 includes Linear Technology's patented NoOpto feedback topology to provide full IEEE 802.3af isolation without the need of optoisolator circuitry.

The oversized power path and high performance fl yback controller of the LTC4268-1 combine to make the ultimate solution for power hungry PoE applications such as WAPs, PTZ security cameras, RFID readers and ultra-effi cient 802.3af applications running near the 12.95W limit.

The LTC4268-1 is available in a space saving 32-pin DFN package.




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