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LTC4267-1

Features: Complete Power Interface Port for IEEE 802®.3af Powered Device (PD) Onboard 100V, UVLO Switch Precision Dual Level Inrush Current Limit Integrated Current Mode Switching Regulator Onboard 25k Signature Resistor with Disable Programmable Classifi cation Current (Class 0-4) Thermal Ov...

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SeekIC No. : 004402547 Detail

LTC4267-1: Features: Complete Power Interface Port for IEEE 802®.3af Powered Device (PD) Onboard 100V, UVLO Switch Precision Dual Level Inrush Current Limit Integrated Current Mode Switching Regulator Onb...

LTC4267-1 Data Sheet

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Part Number:
LTC4267-1
Supply Ability:
5000

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

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Product Details

Description



Features:

Complete Power Interface Port for IEEE 802®.3af Powered Device (PD)
Onboard 100V, UVLO Switch
Precision Dual Level Inrush Current Limit
Integrated Current Mode Switching Regulator
Onboard 25k Signature Resistor with Disable
Programmable Classifi cation Current (Class 0-4)
Thermal Overload Protection
Power Good Signal
Integrated Error Amplifi er and Voltage Reference
Low Profi le 16-Pin SSOP Package


Application

IP Phone Power Management
Wireless Access Points
Security Cameras
Power over Ethernet


Pinout

Connection Diagram


Specifications

VPORTN with Respect to VPORTP Voltage ... 0.3V to 100V
POUT, SIGDISA, PWRGD
Voltage .....................      VPORTN + 100V to VPORTN 0.3V
PVCC to PGND Voltage (Note 2)
Low Impedance Source ...........................       0.3V to 8V
Current Fed ..........................................       5mA into PVCC
RCLASS Voltage .................VPORTN + 7V to VPORTN 0.3V
PWRGD Current .....................................................   10mA
RCLASS Current ..................................................... 100mA
NGATE to PGND Voltage ..........................  . 0.3V to PVCC
VFB, ITH/RUN to PGND Voltages ................  0.3V to 3.5V
SENSE to PGND Voltage ..............................   0.3V to 1V
NGATE Peak Output Current (<10s) ..........................  1A
Operating Ambient Temperature Range
LTC4267C-1 .............................................        0 to 70
LTC4267I-1 ..........................................        40to 85
Junction Temperature ...........................................    150
Storage Temperature Range ...................  65 to 150
Lead Temperature (Soldering, 10 sec) ..................    300


Description

The LTC4267-1 combines an IEEE 802.3af compliant Powered Device (PD) interface with a current mode switching regulator, providing a complete power solution for PD applications. The LTC4267-1 integrates the 25k signature resistor, classifi cation current source, thermal overload protection, signature disable and power good signal along with an undervoltage lockout optimized for use with the IEEE-required diode bridge. The LTC4267-1 provides an increased operational current limit, maximizing power available for class 3 applications.

The current mode switching regulator LTC4267-1 is designed for driving a 6V rated N-channel MOSFET and features programmable slope compensation, soft-start, and constant frequency operation, minimizing noise even with light loads. The LTC4267-1 includes an onboard error amplifi er and voltage reference allowing use in both isolated and nonisolated confi gurations.

The LTC4267-1 is available in a space saving, low profi le 16-pin SSOP package.




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