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LTC4259A

Features: Controls Four Independent -48V Powere Ethernet PortsEach Port Includes: -IEEE 802® .3af Compliant PD Detection and Classification -Output Current Limit with Foldbac -Short-Circuit Protection with Fast Gate Pull-Dow -PD Disconnect Using AC or DC Sensin -Power Good IndicatioOperates Au...

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SeekIC No. : 004402528 Detail

LTC4259A: Features: Controls Four Independent -48V Powere Ethernet PortsEach Port Includes: -IEEE 802® .3af Compliant PD Detection and Classification -Output Current Limit with Foldbac -Short-Circuit Prot...

LTC4259A Data Sheet

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Part Number:
LTC4259A
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:

Controls Four Independent -48V Powere Ethernet Ports
Each Port Includes:
   -IEEE 802® .3af Compliant PD Detection and Classification
   -Output Current Limit with Foldbac
   -Short-Circuit Protection with Fast Gate Pull-Dow
   -PD Disconnect Using AC or DC Sensin
   -Power Good Indicatio
Operates Autonomously or Controlled by I2CTM Serial Interface
4-Bit Programmable Digital Address Allows Control of Up to 64 Ports
Programmable INT Pin Eliminates Software Polling
Current and Duty Cycle Limits Protect External FETs
Available in a 36-Pin SSOP Package


Application

IEEE 802.3af Compliant Endpoint and Midspan Power Sources
IP Phone Systems
DTE Power Distribution


Pinout

Connection Diagram




Specifications

Supply Voltages
   VDD to DGND .......................................... 0.3V to 5V
   VEE to AGND .......................................... 0.3V to 70V
   DGND to AGND (Note 2) ...................................... ±1V
Digital Pins
   SCL, SDAIN, SDAOUT, INT, AUTO, RESET
   SHDNn, ADn ................... DGND 0.3V to DGND + 5V
Analog Pins
   GATEn (Note 3) ................... VEE 0.3V to VEE + 12V
   DETECTn Peak Currents (Note 4) .................. ±80mA
   SENSEn ................................. VEE 0.3V to VEE + 1V
   OUTn .................................... VEE 70V to VEE + 70V
   OSCIN ........................... DGND 0.3V to DGND + 5V
   BYP Current .................................................... ±1mA
Operating Ambient Temperature Range.. 0°C to 70°C
Junction Temperature (Note 5) .......................... 150°C
Storage Temperature Range ........... 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C


Description

  The LTC4259A is a quad -48V Hot SwaPTM  controller designed for use in IEEE 802.3af compliant Power Sourcing Equipment (PSE). It consists of four independent ports, each with output current limit, short-circuit protec-tion, complete Powered Device (PD) detection and classi-fication capability, and programmable PD disconnect using AC or DC sensing. Used with power MOSFETs and passives as in Figure 1, the LTC4259A can implement a complete IEEE 802.3af-compliant PSE.

  The LTC4259A can operate autonomously or be controlled by an I2C serial interface. Up to 16 LTC4259As may coexist on the same data bus, allowing up to 64 powered Ethernet ports to be controlled with only two digital lines. Fault con-ditions are optionally signaled with the INT pin to eliminate software polling.

  External power MOSFETs, current sense resistors and di-odes allow easy scaling of current and power dissipation levels and provide protection against voltage and current spikes and ESD events.

  The LTC4259A is available in a 36-pin SSOP package.

  Linear Technology also provides solutions for 802.3af PD applications with the LTC4257 and LTC4257-1.




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