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LTC4257

Features: ·Complete Power Interface Port for IEEE 802.3af®Powered Devices (PDs)·Onboard 100V, 400mA Power MOSFET·Precision Input Current Limit·Onboard 25k Signature Resistor·Programmable Classification Current (Class 0-4)·Undervoltage Lockout·Smart Thermal Protection· Power Good Signal·Availab...

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SeekIC No. : 004402524 Detail

LTC4257: Features: ·Complete Power Interface Port for IEEE 802.3af®Powered Devices (PDs)·Onboard 100V, 400mA Power MOSFET·Precision Input Current Limit·Onboard 25k Signature Resistor·Programmable Classif...

LTC4257 Data Sheet

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Part Number:
LTC4257
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:

·Complete Power Interface Port for IEEE 802.3af®Powered Devices (PDs)
·Onboard 100V, 400mA Power MOSFET
·Precision Input Current Limit
·Onboard 25k Signature Resistor
·Programmable Classification Current (Class 0-4)
·Undervoltage Lockout
·Smart Thermal Protection
· Power Good Signal
·Available in 8-Pin SO and Low Profile (3mm × 3mm) DFN Packages


Application

·IP Phone Power Management
·Wireless Access Points
·Telecom Power Control


Pinout

Connection Diagram  Connection Diagram


Specifications

VIN Voltage ........................................... 0.3V to 100V
VOUT, PWRGD Voltage .......... VIN + 100V to VIN 0.3V
RCLASS Voltage ......................... VIN + 7V to VIN 0.3V
PWRGD Current ................................................... 10mA
RCLASS Current ................................................. 100mA
Operating Ambient Temperature Range
LTC4257C ............................................... 0°C to 70°C
LTC4257I............................................ 40°C to 85°C
Storage Temperature Range
S8 Package ...................................... 65°C to 150°C
DD Package ...................................... 65°C to 125°C
Lead Temperature (Soldering, 10 sec)................ 300°C


Description

The LTC4257 provides complete signature and power interface functions for a device operating in an IEEE 802.3af Power over Ethernet (PoE) system. The LTC4257 simplifies Powered Device (PD) design by incorporating the 25k signature resistor, the classification current source, input current limit with thermal foldback, undervoltage lockout and power good signalling, all in a single 8-pin package. By incorporating a high voltage power MOSFET onboard, the LTC4257 provides the system designer with reduced cost while also saving board space.

The LTC4257 can interface directly with a variety of Linear Technology DC/DC converter products to provide a cost effective power solution for IP phones, wireless access points and other PDs. Linear Technology also provides solutions for Power Sourcing Equipment (PSE) applications with quad network power controllers.

The LTC4257 is available in the 8-pin SO and low profile (3mm ×3mm) DFN packages.




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