Home > Products > Integrated Circuits (ICs) > PMIC - Power Over Ethernet (PoE) Controllers > LTC4257CDD-1#TRPBF
LTC4257CDD-1#TRPBF

Linear Technology LTC4257CDD-1#TRPBF

Part Number:
LTC4257CDD-1#TRPBF
Manufacturer:
Linear Technology
Ventron No:
3267180-LTC4257CDD-1#TRPBF
Description:
IC POE 802.3AF CONTROLLER 8-DFN
ECAD Model:
Datasheet:
LTC4257CDD-1#TRPBF

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Overview
Description
The LTC4257-1 is a complete Power over Ethernet (PoE) interface controller for Powered Devices (PDs) in IEEE 802.3af systems. It integrates:
25k signature resistor with disable
Programmable classification current source (Class 0-4)
Precision dual-level current limit
Undervoltage lockout
Thermal overload protection
Power good signal

Features
Onboard 100V, 400mA power MOSFET
Precision dual-level current limit
Onboard 25k signature resistor with disable
Programmable classification current (Class 0-4)
Undervoltage lockout
Thermal overload protection
Power good signal
Available in 8-pin SO and low-profile (3mm x 3mm) DFN packages

Applications
IP phone power management
Wireless access points
Telecom power control
Specifications
Linear Technology LTC4257CDD-1#TRPBF technical specifications, attributes, parameters and parts with similar specifications to Linear Technology LTC4257CDD-1#TRPBF.
  • Factory Lead Time
    10 Weeks
  • Package / Case
    8-WFDFN Exposed Pad
  • Surface Mount
    YES
  • Operating Temperature
    0°C~70°C
  • Packaging
    Tape & Reel (TR)
  • Published
    2005
  • JESD-609 Code
    e3
  • Part Status
    Active
  • Moisture Sensitivity Level (MSL)
    1 (Unlimited)
  • Number of Terminations
    8
  • ECCN Code
    EAR99
  • Terminal Finish
    Matte Tin (Sn)
  • Additional Feature
    REQUIRES A NEGATIVE SUPPLY OF 48V
  • Voltage - Supply
    57V Max
  • Terminal Position
    DUAL
  • Peak Reflow Temperature (Cel)
    260
  • Number of Functions
    1
  • Terminal Pitch
    0.5mm
  • Reflow Temperature-Max (s)
    30
  • Base Part Number
    LTC4257
  • Pin Count
    8
  • JESD-30 Code
    S-PDSO-N8
  • Number of Channels
    1
  • Adjustable Threshold
    NO
  • Power - Max
    12.95W
  • Current - Supply
    3mA
  • Internal Switch(s)
    Yes
  • Standards
    802.3af (PoE)
  • Auxiliary Sense
    No
  • Height Seated (Max)
    0.8mm
  • Length
    3mm
  • Width
    3mm
  • RoHS Status
    ROHS3 Compliant
Certification
  • ISO 9001
  • ISO 13485
  • ISO 45001
  • ASA
  • ESD
  • DUNS
  • SMTA
  • ROHS
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